IlikeAuroras Posted February 18, 2023 Share Posted February 18, 2023 I would like to talk about interesting sunspots of the past. We can start off with region 12673 since it formed and grew rapidly, possibly during a solar minimum. More than half of the top 50 solar flares in 2017 occurred in region 12673, and is the reason for the strongest geomagnetic storm of SC24 [KP8]. For me, this is quite an unusual sunspot, because of its occurrence in late 2017, which might be a year in solar minimum. This sunspot could be comparable to region 10930 in December 2006, but that could be in an another topic of its own. 1 Link to comment Share on other sites More sharing options...
Sam Warfel Posted February 18, 2023 Share Posted February 18, 2023 I wouldn’t say 2017 is minimum. Just declining phase of SC24, and the largest storms are known to happen in the declining phase. 3 Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 23, 2023 Share Posted February 23, 2023 I was prompted by a recent discovery of P Bythos to investigate just such an occurrence ( recurrence) of the AR during the declining phase of SC 20 which produced a staggering series of flares and some of the most spectacular prominences ever photographed. In addition it was responsible for triggering magnetic mines during the Vietnam war! It was thought to have made five full passes by our side before expiring. I saw one of displays first hand Aug 4 1972 yeah baby!! 1 Link to comment Share on other sites More sharing options...
3gMike Posted February 23, 2023 Share Posted February 23, 2023 On 2/18/2023 at 12:51 AM, IlikeAuroras said: I would like to talk about interesting sunspots of the past. We can start off with region 12673 since it formed and grew rapidly, possibly during a solar minimum. More than half of the top 50 solar flares in 2017 occurred in region 12673, and is the reason for the strongest geomagnetic storm of SC24 [KP8]. For me, this is quite an unusual sunspot, because of its occurrence in late 2017, which might be a year in solar minimum. This sunspot could be comparable to region 10930 in December 2006, but that could be in an another topic of its own. If you check back through the archive you will find that there was an active region in this position for five rotations AR2665 grew to BGD and produced a couple of M flares in July AR2670 was only Alpha in August AR2682 produced a few B flares in October AR2685 was last appearance in November It might be informative to check complexities / size of each of these regions, and 10.7cm flux as well, to see why it behaved so differently on each appearance. 1 Link to comment Share on other sites More sharing options...
3gMike Posted February 23, 2023 Share Posted February 23, 2023 Here is a plot of Magnetic Field for each rotation. I think this clearly shows development of that part of the disk - around longitude C120. It also indicates similar developments at longitudes C180, C220 and C310 2 Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 23, 2023 Share Posted February 23, 2023 Interesting as always Mike. Thanks! 1 Link to comment Share on other sites More sharing options...
Sam Warfel Posted February 23, 2023 Share Posted February 23, 2023 9 hours ago, hamateur 1953 said: I was prompted by a recent discovery of P Bythos to investigate just such an occurrence ( recurrence) of the AR during the declining phase of SC 20 which produced a staggering series of flares and some of the most spectacular prominences ever photographed. In addition it was responsible for triggering magnetic mines during the Vietnam war! It was thought to have made five full passes by our side before expiring. I saw one of displays first hand Aug 4 1972 yeah baby!! Can you link to any pictures of said prominences? I’m curious to see them, if they were so magnificent! Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 23, 2023 Share Posted February 23, 2023 (edited) https://www.wikiwand.com/en/August_1972_solar_stormI ran across only one that id seen before and suck bigtime at linking anything having sent… exactly the WRONG THING to a certain fm. But will try cuz well gotta learn something useful here anyway iphony or not!! backinabit hopefully Well heck, I was pretty sure id have difficulty finding that single pix, at the time I was merely trying to verify a memory as true that it did enter the gamma region. and it did indeed. Likely not the specific flare that really raised hell with stuff here, but impressive in its duration. I was following link after link sri sam. maybe I will order a new brain from amazon soon🤣🤣 You will know if you find the monster cuz it wraps around the backside before it splits. Awesomeness look at the top I inserted it incorrectly. but a brief synopsis of the storm. Edited February 23, 2023 by hamateur 1953 failed to find flareporn 1 Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 24, 2023 Share Posted February 24, 2023 Thanks Sam! Btw the august 4 1972 still surprises me in yet another quite unexpected way! It ranked only 13th on the running “ scoreboard “ of potsdam A indices!! gee. wondering just why that might be. Anyone?? 2003 storms really ranked up there at #6 and #16! perhaps it is tougher to measure buffeting and the like, just a wild guess here!! Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 24, 2023 Share Posted February 24, 2023 (edited) Im a hoping this is cool enough to whet ur appetites. rats. file size. vhttps://en.m.wikipedia.org/wiki/Solar_cycle_20#/media/File%3ASkylab_Solar_flare.jpg Edited February 25, 2023 by hamateur 1953 Link to comment Share on other sites More sharing options...
Sam Warfel Posted February 25, 2023 Share Posted February 25, 2023 20 hours ago, hamateur 1953 said: Thanks Sam! Btw the august 4 1972 still surprises me in yet another quite unexpected way! It ranked only 13th on the running “ scoreboard “ of potsdam A indices!! gee. wondering just why that might be. Anyone?? 2003 storms really ranked up there at #6 and #16! perhaps it is tougher to measure buffeting and the like, just a wild guess here!! The article said that the main CME was largely northward Bz, I would think that might by why the geomagnetic activity is a little lower, as compared to other great storms? 1 Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 25, 2023 Share Posted February 25, 2023 You are absolutely correct Sam! It been southward…. wowie oh boy Mikey would’ve reeeeeealy liked it!! Link to comment Share on other sites More sharing options...
Sam Warfel Posted February 25, 2023 Share Posted February 25, 2023 3 hours ago, hamateur 1953 said: You are absolutely correct Sam! It been southward…. wowie oh boy Mikey would’ve reeeeeealy liked it!! Could have been Carrington-class if it was mostly southward… 😮 That’d do some damage. 1 Link to comment Share on other sites More sharing options...
Solarflaretracker200 Posted February 25, 2023 Share Posted February 25, 2023 1 hour ago, Sam Warfel said: That’d do some damage. More than some damage, I'd say a lot of damage if it hit us directly. And if the CME was huge that is Link to comment Share on other sites More sharing options...
hamateur 1953 Posted February 25, 2023 Share Posted February 25, 2023 (edited) Ohhhhh it was huge buddy and faster than a speeding bullet to plagiarize “ Superman” follow the link above to the monster I saw finally found it kids ! Edited February 25, 2023 by hamateur 1953 1 Link to comment Share on other sites More sharing options...
Sam Warfel Posted February 25, 2023 Share Posted February 25, 2023 23 hours ago, hamateur 1953 said: Im a hoping this is cool enough to whet ur appetites. rats. file size. vhttps://en.m.wikipedia.org/wiki/Solar_cycle_20#/media/File%3ASkylab_Solar_flare.jpg That is incredible!! 1 Link to comment Share on other sites More sharing options...
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