How Solar Indicies Work: SFI, SN, A & K (

[@fa18mhr]

Dave - It was me (Mark Rowell, fa18mhr aka KC6BPH) who asked the question during your pod cast that prompted this topic and I hope other hams avail themselves of your explanation. I was an electronic technician in the Navy so I am able to grasp many technical ham subjects without too much difficulty, but this is not one of them. Some topic really need your interpretation, taking a complex, highly technical subject and boiling it down to simpler language that everyone can understand. That is your forte and I thank you for doing this for all of us. 73

[@dougtaylor7724]

So glad to see you come roaring back after your blackout. Hope to see you back at 100% soon.

[@mikehannahs]

Thanks for the information David, I’m not ham but love talking on 11 meters, I know I know another one of those cb guys, I really am learning as much as I can and maybe someday will be a ham, I enjoy talking on 11 meters and try to have my station clean and clear, not your typical splatter box here, cb has been a blast and will always be, I’m learning slowly and will always try my best to be a good clean station out there on the bands, thank you again for the information and help, I learn a lot watching others demonstrate their awesomeness 😎😎😎😎😎

[@johnslaymaker]

SUPER appreciate this one -- I've been looking at these solar numbers for a few weeks now without knowing what the heck they really meant. Thank you!

[@DrHWO]

Nice simple explanation Dave, Thank you. Was a bit confused when I couldn't find "hosed" in the Oxford Sudents' Science Dictionary!! 73, M0YZT

[@JimBrand]

I really appreciate some of your recent back to basics episodes. Sometimes we can get a little caught up in technology.

[@nativetexan9776]

Thank you. A lot have asked me about this and I gave them the best I could. Now I can refer them to this video.

[@glenmartin2437]

Thank you. Hope you are feeling better and recover quickly. 73, N0QFT

[@mikemcdonald5147]

thank you for explaining these. Ive seen these posted on various websites but never understood them. Now maybe I will be able to break them down and understand better. Thank you for this video.

[@lyfandeth]

A *great* comprehensive explanation.

[@JamesHindsW5ATJ]

Great explanation Dave. Thanks for the video.

[@tbled52]

Good explanation of something I've been wondering about lately. Now a little insite on predicting propagation would help me. On a side note I work in the power industry. The grid could be quite vulnerable to a gmd. It induces dc currents in high voltage transformers, more so in wye delta configurations i believe, causing issues with with reactive power. Its a complex topic with research still being done.

[@timbacchus]

A fountain of information.....You are looking like you feel good today. Peace and Happiness.

[@stevenbrannen1568]

Dave, Thank you for this timely video. I was just thinking about this. as a new ham I am still learning.

[@baldguyadventure]

The Solar Flux has been 107-110 the last few days! Heard some activity on 10 and 12. Good stuff!

[@curtcanine1585]

Dave- why are some bands propagating better at night? This video gave me two ideas and I wonder if you have any comments. 1.) As the earth rotates within the distorted geomagnetic field (caused by solar wind) it seems the ionosphere would be "larger" on the back side (night side). That is, greater distance between the E and F layers, contributing to wider range of frequencies falling within the MUF. 2.) If we place an X on earth and follow through a 24h cycle, the sun excites the ionosphere during the daylight hours, reaching its greatest excitation at the end of the day. As location X rotates into night, the ionosphere remains in its excited state for hours until its again depleted at the end of the night. This is all very interesting. Thanks for sharing!

[@peterm2618]

Wow! That's exactly the info I was looking for! Many thanks!

[@stewartperry7797]

Looking much better Dave!

[@Ei2iP]

Welcome back Dave, hope you are on the mend, stay safe 👍, de Ei2iP

[@kitharodos21]

best video explaining SFI

[@SimonWilton]

Very nicely explained.thank you.

[@aldarragi7345]

Thank you for the knowledge.

[@nickmoniker]

Very helpful summary, Dave.

[@JT-py9lv]

Dave, a genuine heart felt THANK YOU !

[@ky4tgtodd203]

Another good video. Thanks Dave. 73

[@AaronHuber]

Sunspot number went from zero to over 80 in the past few months. Wow what a difference on the bands!

[@mikeyrepublic]

Thanks for explaining this in a way even I can understand.

[@jerrykr7kz]

Outstanding!!! Now I fully understand. Thanks Dave!!!

[@lyfandeth]

The Carrington Event hit the US too. But it is now estimated to be way less powerful than a documented previous event, before we had so many longlines. As for the grid being built to withstand it...don't hold your breath, most of the grid isn't, as far as I've heard. And it can't be replaced with off-the-shelf parts. GPS and satcoms can only carry so much shielding, and many things (ranging from the stock market to internet security) besides lost drivers depend on GPS.

[@BryanGrigsby]

Great video, thank you.

[@gregjablunovsky841]

Thanks Dave! It helped me make sense of these.

[@ProperLogicalDebate]

First I heard of a magnetic storm was in the old Star Trek TOS (The Original Series) and thought back then that it was just something that a writer dreamed up for a plot line.

[@ve5uo]

This was extremely informative! Thank you.

[@davidsradioroom9678]

Excellent presentation!!! 👍👍👍

[@JoeGilson1]

Dave is the GOAT!!!

[@nevellgreenough404]

Thanks so much for your explanation. This is the clearest presentation of the solar indicies I've ever heard and at last I'm beginning to understand propagation prediction. Thanks again! --N2GX

[@clems6989]

Thanks for this one.. Right on time ! "73" (looking good Dave !)

[@forthy62]

Thanks for this lesson Dave! Very well explained! (As always I like to add :-) ) 73, Stephan, DF6PA

[@mikeoswald8053]

You're looking and sounding better! Right ON! Thanks for the learning. Kb7HFS

[@greglawrencemusic]

Love it! - Thanks Dave.

[@tyannhardyn3018]

Just tell me, how to derive mean of K-Index along observatoriums please.... And how to classify K-Index and A-Index so that these indices can describe how intense solar storm impact to our magnetic field (magnetosphere). My thesis was indeed are about these K-Index.... Please help me...

[@stevemcnaughton-kb3jc96]

Nice video Dave. I use spaceweather.com as a source of this information. As I type this, the sunspot number is 84, the highest I've seen in quite some time. Hopefully, we'll get a good cycle for HF. 73 KB3JC

[@leopoldoalvarez6787]

Nice sun index tipś ..,73ś fron venezuela...!!

[@n.b.4168]

RF is not reflected, it's refracted.

[@billlamb8944]

Thank you Dave. Your show just keep getting better and better. KD9HWH

[@forgetyourlife]

I kept waiting for the top shelf to collapse.

[@BartVanAllen]

Nicely done sir. Complicated subject simplified for us "normal" folks. For up to date numbers, I like to see www.hamqsl.com/solar3.html#hfprop and for weekly vids on what it going on, I really like to watch Dr. Tamitha Skov, aka, the Space Weather Woman. See kzbin.info for her latest video. She also has daily updates, just go to her regular web site. Many others are available, but these should get you started. Many full feature ham logging programs also have built-in propagation components.

[@FjHenderson]

Informative video Dave. We have the satellite SOHO watching the sun, and a fellow KZbinr Tamitha Skov kzbin.info , that has a weekly show thats great. She just posted that a storm is on the way. 73

[@frankartieta4887]

I hear the words Weird Roughly Correlated Are tightly bound together but not real strongly I wonder if you give any thought to becoming a democrat politician perhaps ? Lastly there is not need for any concern. As to do with Major Solar Storms They have fixed that now :) I reckon Build Back Better really happened while I was asleep