Planetary Poles and Magnetic Fields - Sixty Symbols

[@lumer2b]

This was much much more interesting than I thought it would be. Very nice video.

[@elvis_mello]

All fields of physics work like that

[@tommos1]

I feel like she's describing the lead up to the end of the world.

Look up the magnetohydrodynamics (MHD) of active galactic nuclei (AGN) accretion disks. Mind blowing and still so much to be discovered. It is motivating me to learn higher maths. I promise it's worth it and excellent therapy for getting away from the horrible state of world politics and social conditions right now.

[@vikranttyagiRN]

@ Amazing

[@ishworshrestha3559]

Ok

[@BobStein]

What a treat to listen to a very knowledgeable person with excellent communication skills. More of that, mankind.

[@daddymuggle]

On a side note, it's reasurring when these very, very smart people stumble over the occasional word. It helps me feel better about my own speech.

[@greypaladin4560]

As a Canadian I am not sad about this. We can share the North pole. And for anyone that is asking; yes, Santa is Canadian. His postal code is H0H 0H0.

[@ronaldderooij1774]

Nope, he is fake. The real one is in Finland. He has a postal code there too. I don't remember what it was. But in fact, they are all fake derivatives of Sinterklaas (Dutch) which is a fake derivative of Thor.

[@MinecraftCoolCreeper]

@@ronaldderooij1774 rustig aan ronald was grapje

[@hjembrentkent6181]

North pole is just going to be open ocean anyway, the south pole is the place to be in the future. Unless we use nuclear power to stop the climate crisis ofcourse.

[@mheermance]

Sounds legit.

[@rursus8354]

Nonsense, everybody know that Santa is Finish.

[@whatdamath]

Brilliant video! Love Dr Gray's enthusiasm!

[@culturecoroner]

ANTON! Hey, Buddy! Love your videos!

[@jerrdnn3373]

I agree Anton. Also, your videos are fantastic,as well!

[@nitbot]

Hello wonderful person

[@thedecktothe16thpower56]

Like a true Eagle Falconeer.

[@danielmichaelanderson8034]

Anton... You're rad!!!

[@ryanrockers]

That sound effect on the google earth zooms is definitely the sound of the Imperial Probe Droid on Hoth from The Empire Strikes Back right?

[@sylviasaint7966]

You've got it backwards. In the movie it wasn't the Imperial Probe it was the "Google Drone" sending the map data. :-D

[@Triantalex]

false.

[@acetate909]

This video is awesome and is surely the start of a magnetic pole rabbit hole for me. If I'm not back in a week send a search party with a map and a -compass- better map.

[@darrenmarchant1720]

an interesting instrument for finding magnetic fields is called a Ferrocell; it is a small amount of magnetic fluid called Ferrofluid developed by NASA sandwiched in between two glass plates with LED lights around the sides. very interesting.

[@acetate909]

@ Lol...@MHD.

[@RWBHere]

Evan Fields, even better, send someone with GPS kit.

[@DevangLiya]

It's been a week. Are you back?

[@daviddroescher]

To look into the rabbit hole with a periscope watch Ben Davidsons earthchanges playlist on his Suspicious Observers KZbin channel

[@exoplanets]

Thank you for making these awesome videos!

[@rogl9395]

Who knew that when combining Navier-Stokes and Maxwell's equations things would get complicated.

[@garak55]

Ever since i was a young undergraduate recoil in fear at the words Navier Stokes...

[@josephdestaubin7426]

"It's a very complicated field." Scientist really can't help themselves with the puns.

[@its1110]

Blame the linguists... they made the words. We just use them.

[@josephdestaubin7426]

@@its1110 Linguistics don't make words. Now that I think about it, scientists make way more words than any other group I can think of. That's not a bad thing. But it is true.

[@its1110]

@@josephdestaubin7426 And just imagine what must be the case with __German__ scientists. Given all the compounding. :) We'll just leave it to the Semanticists to fight over later.

[@penand_paper6661]

@@its1110 At least they ain't Inuit...

[@Zero11s]

globe earthers aren't scientists

[@jeremytravis360]

Back in 1964 my science teacher told me that magnetic deviation was caused by large loadstone deposits in Canada. I did watch a documentary recently about magnetic pole reversal and they made it out to be quite alarming. Thank you for this fascinating video.

[@no_handle_required]

Everyone on these videos always seems so excited about their individual subjects. That's so inspiring. If i had professors like this when I was in school or college, I might be doing something very different right now, instead of commenting on a youtube video.

[@Allamuylejos]

It is a pleasure listening to such an knowledgeable person. Dr. Gray makes the subject approachable for all audiences. Thank you for posting it.

[@JasonRobards2]

This answers a whole bunch of answers I had about this subject. Good video!

[@xCorvus7x]

3:51 'half of Earth's interior' Since we are talking about a volume, should the radius corresponding to half of it not be (Earth's radius) * 1/2^(1/3) = 6371km * 1/2^(1/3) = 5055km ?

[@oriepierce7034]

Before GPS when ,as an airline pilot, we had to fly over the very north we had to be very wary of losing Inertial Navigation computation of the offset caused by the variable magnetic offset required to stay on course.

[@PlusNeu]

Would it be considered "going into the dark"?

[@MarcCoteMusic]

I always enjoy the videos with Dr Gray... As a Canadian, I may be biased in this... But one thing I notice every time is just how precise her diction is. I don't know if I've ever heard anyone else speak with such clear articulation.

[@clayainsworth9018]

I notice the British accent creeping in.

[@IMadeOfClay]

[9:08]. "a bit wonky". Dr Gray sounded well English. She's been hanging out with us for so long she's picking up an accent 😂. And we're happy to have her 👍

[@polares8187]

I love Dr Meghan's videos. Thank you brady for making these awesome videos and thank you Dr Meghan for making them informative and lovely.

[@imager8763]

Meghan Gray always has a wonderful way of explaining things!

[@clarsen01]

At 5:16 in the video it was mentioned that there would need to be a "Seed field", where does that come from?

[@StarkRG]

Magnetohydrodynamics? Shouldn't there be thermodynamics in there as well? Magnetothermohydrodynamics. But what if you need to simulate a single electron in that mess? Well, that'd have to be quantum magnetothermohydrodynamics.

[@hamstsorkxxor]

You are giving me nightmares and Vietnam flashbacks simultaneously.

[@StarkRG]

@@hamstsorkxxor Just be glad you don't have to factor in gravity...

[@lijemutu]

But if this electron is moving near light speed that would be quantum relativistic magnetothermohydrodynamics

[@StarkRG]

@@lijemutu The problem with that is that an electron can't move at relativistic speed through a medium, which is required for all the other bits. Nice try, though.

[@orthochronicity6428]

Fusion research looking at particle scattering in the plasma deals with exactly this scenario. There's also an application for this in the early universe where you get to factor in relativistic effects along domain fronts formed as the universe expands, which might help address why there is so much more matter than antimatter in the universe, depending on what still undiscovered physics you decide to include in your calculations. I'm pretty sure the fusion people have the more complicated scenario though, because they actually need fine details where the cosmologists and particle physicists can just worry about average everything (probably).

[@astropredo]

Dude, this video is just magnificent! Thank you! I wish to work with you guys one day. I have a colleague that will soon, I'm totally jealous hahaha

[@kchorman]

Do our cell phones do the self correcting when you turn on the compass apps (i.e. the built-in one on the iphone)?

[@mastod0n1]

Pretty sure those apps use GPS and the accelerometer inside the phone to simulate a compass and it's not a true compass. So I imagine they show a pretty true north. Edit: I was wrong. Phones do have magnetometers built in. Should have done a quick Google search first!

[@saintchuck9857]

@@mastod0n1 no, magnetometer so magnetic north. quite accurate as well.

[@robmckennie4203]

presumably the hardware in engineered such that there is no internal interference. Plus, as long as the interfering field doesn't move with respect to the sensor, and isn't strong enough to swamp out the sensor, you can compensate for interference

[@fx4d]

there's a setting for it--you can choose.

[@tiagotiagot]

Depends on the app; some do the correction, some don't, and some shows both the true and the magnetic north (using your GPS position to figure out the required correction)

[@MelancholyCrypto]

Discored so much stuff I didn't know before watching this vidoe, and now I have an interest in this subject, thank you!

[@binky_bun]

Interesting stuff. As a radio amateur I notice these effects all the time as the Earth's magnetic fields affect radio propagation. I've not been licenced long so I've yet to see a full solar cycle but sporadic E propagation I find amazing. Usually VHF is line of sight or a little beyond but I've seen it open up to Western Sahara. No one fully understands it but it really is interesting to experience

[@Alfreditop]

Loved it!!! Thanks for your time and effort!

[@shevek5934]

Awesome video! I wish you'd asked why the magnetic and geomagnetic poles are different. That seems surprising and non-obvious.

[@frankman2]

Yes. I think they glossed over that. Maybe they thought it was too obvious. Had to search for the answer elsewhere. Great video BTW !

[@TheMadgeorge]

I just finished watching Anton Petrov's video on the poles flipping, then the one front EON. Yours popped up in my feed. It was a nice companion piece and very well done. Thank you!

[@avijitkundal2109]

finally a new sixty symbols video, where have you guys been?

[@patrik5123]

Two words: Hello Internet.

[@JAzzWoods-ik4vv]

@@patrik5123 Two words: wax cylinders

[@RT710.]

Wow, one of the best videos in recent memory!!

[@AbnormalWrench]

Those magnetic topographic maps were amazing. I had no idea there was that much variation.

[@darktruth7627]

Once the magnetic reversal is done and the poles are no longer moving, (for a while) do you think that the poles will be renamed or call what's in the North, the South pole?

[@mike3684]

I have no idea if this is at all related, but the regularity of the pole flip, along with its "wandering" nature sounds like an Intermediate Axis phenomenon... just kinda has that feel to it...

[@IanGrams]

Huh that's a pretty interesting comparison I'd not considered before. I like the way you think!

[@Gafa996Gaddisa]

I am subscriber in this channel with multiple devices. I like all the scientist how they explain.

[@lennutrajektoor]

Brady, can you do follow-up on this where very precise atomic clocks are used to measure minute changes in gravity and thus allowing to "see inside the Earth" and on top of that attempts to use neutrinos to map interior of the Earth. I know neutrino detector and beam is used to screen through Fukushima nuclear rectors to get a picture how the melted core inside looks like. Neutrino thing is very in its infancy but very precise atomic clock approach is long known.

[@lordgarion514]

I thought they used muons to image inside Fukushima?

[@lennutrajektoor]

@@lordgarion514 Yes, my bad! It was indeed muon tomography attempt. Now the Q is can it be used for screening thicker objects.

[@calebmerritt8788]

Great video! I had no idea that magnetic north has been moving!

[@7munkee]

3:35 We don't know anymore about the earths core than we do about the magnetic field. We ASSUME its solid iron, but when you apply logic, how can the core remain solid when it is surrounded by molten iron?

[@7munkee]

@SpyingDutchman When you heat iron, it loses its magnetism. Yet we have a magnetic field???

[@yommish]

Melting point increases as pressure increases. The pressure is greater at the center which increases the phase transition point.

[@ruipaulovigario1115]

Great video. I was left with a doubt, though: why isn't the magnetic pole coincident with the geomagnetic pole? and why are they so far apart? Instead, it seems the geomagnetic poles should locally generate a locally vertical field, right?

[@rajat0610]

Where does the seed magnetic field come from?

[@False798]

It could have come from any source that created even the tiniest of electrical currents or electromagnetic fields; the magnetic field would induce a difference in voltage in the Earth between two points, cause current to flow and a new electromagnetic field generated which would feed more induction, more current paths until you have a self-exciting planetary magnetic field - but that is just my opinion.

[@rajat0610]

@@False798 Sounds interesting!

[@ahmedmuhammed6905]

U killed it although it is very complicated topic and also power points and images were so helpful

[@culwin]

"Astronomers don't know a lot about magnetic fields" And a thousand juggalos liked this video

[@KrisShamloo]

One of the best Sixy Symbols videos ever.

[@marcobertoglio7729]

so much knowledge, so much passion! Given away so humbly and yet so clear and engaging. You deserve 7 billion views! Now I know a little more about the place where I live, and the place where I am going to die. Thank you!!!!!

[@damedesmontagnes]

Another question: up north is it a pushing or pulling magnetic force? And so it would be the opposite at the south magnetic pole?

[@johnbouttell5827]

According to the Finnish Tourist Board, Rovaniemi is the Official Hometown of Santa Claus in Lapland.

[@chrisschaiberger6258]

I so admire really smart people!! Brilliant and extremely well spoken.

[@Confuseddave]

...were those the Imperial Probe Droid sound effects? I thought it was just a coincidence with the garbled speech, but the the "wom-wom-wom" sounds kicked in...

[@jacobdoran9433]

I think it was

[@conflict6292]

Dont think so, but they were Very similar. Just dont let Han or Chewy (rip) shoot any of the poles !!... ;-)

[@puddintaine4556]

..and Saturn.

[@tnekkc]

In order to design power supplies, I designed magnetics; transformers, inductors, and baluns. I have a number of formulas I use, but I have no way of explaining what is magnetism. I just use the formulas and the parts work.

[@briandeschene8424]

Often, empirical data and mathematical formula allow for predictable results. This creates the ability to engineer reliable solutions which leverages them prior to an actual theoretical understand of why.

[@PeterVC]

This was super interesting!

[@billrussell3955]

This vedio relates to my astrophysics conjure supported by French science papers. My conjure submitted to MIT Solve 2018. It relates to the moon. My interests lie in the atomic quatum dipoles of systems and their variable nature. And what drives them. My discoveries include a paradox related to the torofluxus and other noneuclian differential geometries. I am a non-credentialed experimental physicist. This was an awesome clip! Thank you!

[@man_of_lawlessness]

Thanks for sharing such a detailed video. I don't know why scientists never mention solar activity such as long periods of solar intensity (modern maximum) or the repeating cycle called the grand solar minimum. It's not a coincidence that the poles are moving faster and the previous 4 solar cycles have had less sun spots with a weakening magnetic field. Then there's the south Atlantic anomaly which looks like it's preparing itself to become either a north or south pole. Just wanted to add, imagine if the sun was to hibernate then any notion of a magnetic field on earth is laughable. The driver for the magnetic field must surely be the sun! These satellites are simply measuring the effect that the sun has on our planet. For years now I've seen stories upon stories about migrating animals flying or moving to the wrong place following their inner compass and then dying in a horrific "mass die off". I think humans are in trouble if we experience an excursion because our bodies rely on the magnetic field too. Life expectancy will go back down to low numbers as we try and adapt to the change in polarity. We're in serious trouble. Thanks 👍

[@stuskivens4295]

Bangui anomoly seems quite close to the Oklo natural fission reactor - is there a relationship?

[@Kowzorz]

I wonder how the sun's field affects the formation of each planet's field.

[@briandeschene8424]

I believe the video speaks of three things being required for a planet to have a magnetic field. One was identified as the Seed Field which I believe the Sun is providing. At least that’s my understanding of this item from the video.

[@dahemac]

Hurray for the Schlumbergera. I always get excited to see it in the background.

[@kirkmattoon2594]

So Mars lost its atmosphere when its lost its magnetic field. What about Venus? We're told it too lacks a magnetic field, but it has an extremely dense atmosphere, despite being subjected to more intense solar wind than Earth or Mars. How come?

[@VariantAEC]

Never heard that Venus doesn't have a magnetic field. Will have to look that up some time. Will postulate preemptively that Venus' gravity being greater than Mars' helps along with the fact that it's atmosphere is made of denser gases and that active lightning storms on Venus may also help repel solar wind. That's my guess.

[@jazzthewarden]

Mars has a magnetic field. It's just extremely weak and nowhere near as complex as the Earths or other bodies.

[@orthochronicity6428]

It sounds like Venus doesn't have a magnetic field produced from a geodynamo (like us), but rather a weaker magnetic field resulting from charged particle interactions between its ionosphere and the solar wind. It's apparently strong enough to provide some protection from the solar wind stripping its atmosphere off.

[@numb3r663]

Venus is a captured comet that pulled away Mars atmosphere as it passed...Prof James McCanney has written books on the subject for 40 years but main stream science isnt smart enough to digest the info.

[@kevindiver6327]

@@numb3r663 velokovsky wrote a book about that 70 years ago worlds in collision

[@ragnkja]

When I was a child, magnetic north was in the same direction as true north as seen from where I grew up, but this is no longer the case - it’s a few degrees off now, and I never learned to adjust my bearing based on that offset since it wasn’t necessary when I learned to use a compass.

[@mrshhjj8899]

The poster above me is a pidgeon. Try not to feed it and it will go away.

[@ragnkja]

@@mrshhjj8899 Wtf?

[@flamencoprof]

"It's a very complicated field." I see what you did there.

[@robertunderwood1011]

I wish there had been some discussion of magnetars. What are the theoretical upper limits on how strong a magnetic field can get?

[@c28baby]

So, what I take from this video is that the Earth's magnetic fields are Imperial probe droids.

[@NefariousKoel]

They're looking for our planetary shield generators.

[@sakadabara]

Electronic Arts Jedi Knights

[@NefariousKoel]

@@sakadabara Nah. The imperial probe droid in Empire Strikes Back, to be precise.

[@singingtallit583]

I’m surprised they didn’t self destruct as soon as they were located

[@Triantalex]

??

[@ThomasEJensen_TEJ]

Man that brought me back to my time in maritime navigational school. i remember this initially gave me a headache, combined with deviation and drift. it took some doing to recondition the brain to get it right.

[@Tenshan]

This was the most fabulous animation of an asteroid hitting the Earth I have ever seen

[@PhilHibbs]

I'm surprised that there is only one single place where the compass needle would point straight down. With all the fluctiations and deflections, I'd expect there to be quite a few places around near the geomagnetic pole where it points straight down. 17:39 Mars has a solid core, no conduction? No convection, surely...

[@vmkarthikn]

Somebody explain abt Mars Mag field

[@brentgauspohl9779]

Dr. Gray has been in britain too long; listen to those 't's! (Great video, as always.)

[@infinidominion]

The Oclo mine in Gabon is not so far from Bangui. Possible connection?

[@erictaylor5462]

This is a big deal in aviation as well. But of course deflection makes a bigger difference.Of course hiking you'll be doing well to go 25 miles in a day. Flying you can go 250 miles in just 30 minutes.

[@exponentmantissa5598]

I have been to locations in the Canadian Shield where compasses are very difficult to use if no impossible. There are local magnetic anomalies that can cause the compass to swing up to 180 degrees in just a few hundred yards.

[@anwanand]

Oh ! really ?? I do have a question ... how do the electrical things work in such areas ? eg. motor for example ??

[@briandeschene8424]

@@anwanand It appears no one ever answered you. Fortunately the Earth’s magnetic field strength is measured in microTesla whereas magnetic fields in an electric motor would be in at least milliTesla or much higher units. The Earth’s magnetic field would have no measurable effect on most cases.

[@MegaSkills9]

183 documented reversals in the past 83 million years (see comment below) of the magnetic pole flipping. They can see it in rocks from different time periods. This is a scientific fact. It's not a debatable issue like some people seem to think.

[@ronaldderooij1774]

Nobody doubts it. But I could be wrong. Many scientific facts are doubted by many idiots/flat eathers/climate change denialers and so on.

[@FredCompusmurf]

Unfortunately the flip occurs every 12000 years so there have been many more reversals than documented. (More info can be found in a playlist called prove on my channel.)

[@MegaSkills9]

@j carlton What did you notice specifically?

[@MegaSkills9]

@j carlton Nothing can take the stars out of the sky. Obviously clouds or dense fog can obscure them.

[@MegaSkills9]

@j carlton There have been 183 documented reversals in the past 83 million years. There are also thousands of short term and temporary reversals. I witnessed one in the late 80's when a huge CME (Coronal mass ejection) from the sun hit Earth and overwhelmed our magnetic field. I watched (With my own eyes) as my compass pointed SOUTH for 11 minutes. (Instead of North.)

[@georgeargiriadis112]

Do we know much about the movement of the geomagnetic field? I'm having trouble finding anything. It sort of sounds like the magnetic field is subject to geological effects alittle closer to the surface. If the geomagnetic field isn't moving, I think this is not an indication of a magnetic reversal. I admit I'm completely puzzled by the idea of a magnetic reversal. The rotation of the core of the Earth just flips 180°?

[@jursamaj]

It's not true *all* speakers have magnets, altho a large majority do. There *are* electrostatic speakers.

[@TheSpirituralWackadoo]

you did a fantastic job describing the main magnetic field a couple things for corrected sense but you got that one in particular detail. There is a name for the spinning motion for gold and nickel core. iron holds unstable feild lines. The magnetic field in the spinning motion of the Earth are bound together without one there's not the other

[@oldinion]

2:35 LIES! Santa lives in Korvatunturi in northern Finland, not the north pole. That's just American propaganda.

[@kolloKkoistinen]

I was just to make that same point.

[@CircaSriYak]

No you dunce he lives in Svalbard

[@kolloKkoistinen]

@@CircaSriYak show me some evidence. We have a lot of photos.

[@zapfanzapfan]

"Where Santa lives"... you forgot to include Superman ;-)

[@its1110]

Has anyone ever seen Santa and Superman together? Well!! "S"! It's the "S", people!

[@phonkey]

Superman is not real though.

[@loge10]

Superman doesn't actually live there. He just has a place to get away-from us when we drive him crazy...

[@JJRed888]

Basic EM tells us that once you have flows of charged particles you will have magnetic fields. So, why do you NEED a seed field to start the process?

[@ragnkja]

Lucie Green would be a great scientist to interview if you want to make a video about the sun’s magnetic field.

[@michalhikrysz]

What do you mean at 10:48 by "it [=the pole] started moving northwards" ? :)

[@mendel7575]

Wow! A changing magnetic field would certainly affect the global climate!

[@xway2]

not necessarily

[@FredCompusmurf]

👍 yes it does and when it reverses, it's game over!

[@zaubergarden6900]

love the scout drone sound effect while zooming in to the poles

[@briankerr4512]

maybe the magnet field is induced by the solar electric field.

[@TheDuckofDoom.]

Locally we have gone from 22 degree magnetic offset to 16 degrees in the last 3 decades.(Tacoma) And that is enough to effect common compass use, not catastrophic to a hiker but rough surveying and aircraft should adjust, 5 degrees is about 9 miles per 100 miles traveled(or 9 feet per 100 feet) and most small aircraft travel more than that per hour and have 4-5 hour fuel tanks so missing an airport by more than 40 miles is quite plausible without other references to cross check.

[@crackedemerald4930]

It's a time of big stress for old-school sailors

[@gonecoastal4]

Yeah, 'm glad I got of the USCG before the Emergency update of the variation. Changing all the Navigation standards and chart work would be a monstrous feat.

[@kevenskilatonyius2178]

Does the Auroras NORTH and South . Show the Magnetic Poles movement . As the Earth rotates . ?

[@maxchill308]

And when everything else fails, follow the birds.

[@michaelsnodgrass9415]

And the sun the moon And the stars.

[@timharig]

Which just leads you to a field full of amorous birds.

[@youtube.youtube.01]

Great video and narrative. I have often believed that the planet Uranus is actually experiencing it's own magnetic reversal at this time. My thoughts on the cause of a magnetic field is a relative axis motion between the core and a surrounding viscous fluid. When the delta between the two relative motions are greatest, a magnetic field is strongest. When the delta is lesser, then weaker. When they exchange spinning rates, then the magnetic field reverses. A model of the reversal can be compared to the common illusion seen with old films showing an airplane propellor at engine startup and revup. The film framing constant compares to the earth's core. The propellor compares to the surrounding viscous fluid. Changing the speed of the propellor presents the illusion which compares to the magnetic field intensity changes and reversal.

[@slartibartfast336]

1:28 - argh, topoGRAPHical, not topoLOGical.... :(

[@Bacnow]

Nerd!

[@xCorvus7x]

1:28 is a better time stamp.

[@slartibartfast336]

@@xCorvus7x - yep, fixed!

[@elinope4745]

This plays a larger part in climate change than the community wants to admit publicly. The solar wind gets pulled in at the poles, when the poles shift, the climate shifts. The magnetic north pole is right over Greenland, if you don't think those auroras are a visual clue as to the northern glaciers being bombarded by cosmic rays, then you aren't thinking very hard about it and how solar wind has an impact on climate.

[@lordgarion514]

27 flat Earthers couldn't handle this.

[@johnmurrell3175]

Interesting video, a couple of points first it is not only magnets that deflect a compass it is any iron or steel - that is why when using a magnetic bearing compass you should always take 3 readings preferably at about 120 degrees to each other. The other thing is with the UK now being in the process of moving from a Westerly declination to an East one you need to remember to apply the magnetic compass to true correction the correct way. The zero declination line is just about to pass my house so I will soon be in the Eastern magnetic hemisphere but I can't say I have noticed any difference. It's quite difficult to observe the actual declination not helped by the fact the pole star is displaced from the rotation axis of the earth by about 1/2 degree. In terms of the impact on ships compasses I think the sailing directions contain warnings about areas where there are local magnetic anomalies - I seem to remember there are a couple in the Western Isles of Scotland. The magnetic anomaly chart shown is also used to navigate submarines under water. A combination of the depth of water and the local magnetic deviation provides a position without having to raise the mast with the GPS aerial above the surface and thus possibly giving the position of the sub away.

[@keepmoving1185]

I think they underestimate the danger of a pole shift.

[@larryscott3982]

I was surprised that there was no mention of the diurnal (daily) 80km oscillation of the magnetic poles. “.... Geological Survey of Canada measured the daily movements of the MNP using the CANadian Magnetic Observatory System (CANMOS) and found that the diurnal variation of its location is up to 80 kilometers with the average path of the variation forming an oval around a given point. ...”

[@jackburton5085]

!WARNING! Whenever we talk about "Magnetic Fields" somewhere on the globe, a flat earther, dies ... Now....let's talk about Magnetic Fields.

[@andro_slav]

Oh my god! Finally a video, you’ve got me waiting wayyyy too long! Thanks tho!

[@DamianReloaded]

8:30 Wakanda!

[@khilorn]

Damian Reloaded dude your right

[@AlexKnauth]

I think Wakanda is further east than that

[@pyrokinetikrlz]

I thought about the same, but you beat me to it

[@JediBuddhist]

🌏 Love the Ice Planet Hoth - Imperial Probe-Droid Sound effects. Very apt.

[@PTNLemay]

So England gets GMT, and they get a near zero deviation to point at true north. Unfair.

[@aknopf8173]

Think about the weather, though.

[@cockbeard]

We did invent the earth

[@dmk351]

3:40 could you explain how the solid core is submerged in liquid iron without melting? the more pressure builds up, the hotter it gets, right? so how can the core(where the pressure is at the maximum) be hotter than the molten iron around it without melting? btw be careful when using star wars sounds, i hear they are quite protective of their IP.... ;)

[@ehess1492]

dmk It’s the pressure that keeps it solid. Don’t think of it like an ice cube sitting in water with a clear solid/liquid demarcation. There’s a boundary layer of iron at varying rotational speeds and viscosity separating the liquid from the solid.

[@malice1105]

Liked the 'Hoth probe' sound from Empire Strikes Back.

[@MasterHigure]

Wouldn't the magnetic pole close to the geographic north pole be the magnetic SOUTH pole, as the north pole of a compass points toward it?

[@Melthornal]

My physics professor studies the earth's magnetic field. He makes these gigantic models of earth with salt water ice and measures how the core changes and moves over time. I found it very interesting.

[@TheNickBasso]

Amazing videoooo 😍😍😍 keep it up Brady and professors

[@ro_yo_mi]

I feel slighted. On one hand, this video was 20 minutes, but on the other Meghan's conversational style made it go by too fast.