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Post by lsvalgaard on Jan 19, 2012 20:51:22 GMT
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Post by justsomeguy on Jan 20, 2012 0:51:01 GMT
Very nice talk, although a big download!
This is a wonderful piece of detective work backed up by robust science to prove the finding. It is just absolutely stunning that it happened.
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Post by sigurdur on Jan 21, 2012 1:04:11 GMT
Dr. Svalgaard: An exciteing paper to read.
I do have one question:
What does IDV stand for? I was understanding your findings as well as I can with my limited knowledge until I stumbled with this term.
Thank you for your response.
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Post by lsvalgaard on Jan 21, 2012 1:45:33 GMT
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Post by sigurdur on Jan 21, 2012 18:43:36 GMT
Thank you Dr. L.
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Post by Bob k6tr on Jan 22, 2012 19:16:23 GMT
The number of Coronal Holes has been much lower than we have seen at the peak of the cycle when compared to the last several cycles. Also the size of the Holes have been pretty anemic. it would be helpful if you could find a plot of coronal holes [number and sizes] over the last several cycles. I don't know of any such plot and would be interested in seeing one. Hi Leif Like yourself I have never seen plot of Coronal Numbers and sizes But I have followed Jan Alvestad's webpage since 1997 and watched the Active Solar Regions Map. Jan holds about 10 Years of back reports and purges out the rest. The Coronal Holes visible on those pages during the Cycle 23 Solar Max were much larger than what we see right now. Check out the Map on : www.solen.info/solar/old_reports/2003/january/20030119.htmlThat shot was taken of a Coronal Hole 2 Years after the peak of the Cycle. Compare that to what we are seeing today. The Coronal holes at the Peak were considerably larger to what is seen in that photo. Yes this does not represent any type of rigorous analysis but to me it would seem there is more than sufficient anecdotal data to warrant such a study. Regarding Jan's website I dn't know if he purges his data all together or archives it offline. The USAF also published a considerable amount of Solar Data from their earthbound network of observatories in the late 90s. But all of that pretty much went away shortly after SOHO came online. Coronal Hole Data they have from Cycles 21 and 22 would shed a great deal of light on the subject but I don't have a clue as to how to obtain it, if that even is possible.
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Post by justsomeguy on Jan 23, 2012 13:56:25 GMT
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Post by lsvalgaard on Jan 24, 2012 5:38:44 GMT
it would be helpful if you could find a plot of coronal holes [number and sizes] over the last several cycles. I don't know of any such plot and would be interested in seeing one. Hi Leif Like yourself I have never seen plot of Coronal Numbers and sizes But I have followed Jan Alvestad's webpage since 1997 and watched the Active Solar Regions Map. Jan holds about 10 Years of back reports and purges out the rest. The Coronal Holes visible on those pages during the Cycle 23 Solar Max were much larger than what we see right now. Check out the Map on : www.solen.info/solar/old_reports/2003/january/20030119.htmlThat shot was taken of a Coronal Hole 2 Years after the peak of the Cycle. Compare that to what we are seeing today. The Coronal holes at the Peak were considerably larger to what is seen in that photo. Yes this does not represent any type of rigorous analysis but to me it would seem there is more than sufficient anecdotal data to warrant such a study. Regarding Jan's website I dn't know if he purges his data all together or archives it offline. The USAF also published a considerable amount of Solar Data from their earthbound network of observatories in the late 90s. But all of that pretty much went away shortly after SOHO came online. Coronal Hole Data they have from Cycles 21 and 22 would shed a great deal of light on the subject but I don't have a clue as to how to obtain it, if that even is possible. The 2003 coronal holes were well on the declining phase [similar to 1973 and 1952] and not typical of maximum. Right now there is a very large southern hole: sdowww.lmsal.com/sdomedia/SunInTime/2012/01/24/l0193.jpgBottom line: beware of sweeping statements.
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Post by france on Jan 26, 2012 20:28:00 GMT
Hello about coronal holes : perhaps they occur near proton events. If so it could be interesting to verify with proton events.
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Post by lsvalgaard on Jan 27, 2012 2:48:42 GMT
Hello about coronal holes : perhaps they occur near proton events. If so it could be interesting to verify with proton events. proton events and flares occur at the boundaries of coronal holes: www.leif.org/research/Hale-Flares.pdf
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Post by france on Jan 27, 2012 13:24:17 GMT
Hello about coronal holes : perhaps they occur near proton events. If so it could be interesting to verify with proton events. proton events and flares occur at the boundaries of coronal holes: www.leif.org/research/Hale-Flares.pdfthanks Dr Svalgaard, I thougt it was inside and I supposed the luminous flares at the boundaries were the magnetic connexions when heavy protons go away and meet the electrons on solar surface. At the boundaries I just learn it Flares too ? I didn't know. Is it the only way they happen ?
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Post by france on Jan 28, 2012 0:59:25 GMT
dr Svalgaard it's written in abstract
that doesn't mean the change of polarities due to change of cycle ? only the + and - that make the brightness of sunspot, isn't it ?
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Post by france on Jan 28, 2012 13:52:26 GMT
look at that dr Svalgaard : what a picture how dark is it at the top left ! it's very rare, I never see that, and you ?
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Post by lsvalgaard on Jan 29, 2012 0:10:38 GMT
dr Svalgaard it's written in abstract that doesn't mean the change of polarities due to change of cycle ? only the + and - that make the brightness of sunspot, isn't it ? just the sunspot polarity change
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Post by lsvalgaard on Jan 29, 2012 0:11:48 GMT
look at that dr Svalgaard : what a picture how dark is it at the top left ! it's very rare, I never see that, and you ? There are often such dimmings after a CME.
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