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What is the distance of typical solar flares ??
ANDREW ROBERT BREEN wrote:
Not sure that you need H-alpha material /strictly/: I'm pretty sure such things weren't around in the 1850s when Carrington and Hodgson observed the great flare of 1859 - Some very intense flares have been seen in white light against the disk of the sun, but these so-called "white light flares" are *very* rare as flares go, and the material ejected by them is, of course, not visible in a white light filter. During the peak of solar activity, I could observe almost every day or so for a few hours and see at least one small flare (and major flares once or twice per week) with my H-alpha filter, but none of these ever appeared in white light. Even some of the monster X-class flares I have watched have not quite passed into the white-light category. Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 11th Annual NEBRASKA STAR PARTY * * July 18-23, 2004, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#12
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What is the distance of typical solar flares ??
In article ,
David Knisely wrote: ANDREW ROBERT BREEN wrote: Not sure that you need H-alpha material /strictly/: I'm pretty sure such things weren't around in the 1850s when Carrington and Hodgson observed the great flare of 1859 - Some very intense flares have been seen in white light against the disk of the sun, but these so-called "white light flares" are *very* rare as flares go, and the material ejected by them is, of course, not visible in a white light That was the point I was trying to make - that being pernickity you don't need H-alpha to see a flare, but you might wait a very long time to see one if you don't use it.. Agree wholly with all you have to say, of course. filter. During the peak of solar activity, I could observe almost every day or so for a few hours and see at least one small flare (and major flares once or twice per week) with my H-alpha filter, but none of these ever appeared in white light. Even some of the monster X-class flares I have watched have not quite passed into the white-light category. Clear skies to you. Not even the X28 (and possibly up to X45) flare last November? I was talking to some people a month or so ago at the European Geosciences Union meeting and it seems that Carrington's flare is now thought to have been significantly bigger than the 4th November 2003 event and might have been up in the X55-X60 range - this would fit in with it being clear as a white-light event. Interesting.. -- Andy Breen ~ Interplanetary Scintillation Research Group http://users.aber.ac.uk/azb/ Feng Shui: an ancient oriental art for extracting money from the gullible (Martin Sinclair) |
#13
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What is the distance of typical solar flares ??
In article ,
David Knisely wrote: ANDREW ROBERT BREEN wrote: Not sure that you need H-alpha material /strictly/: I'm pretty sure such things weren't around in the 1850s when Carrington and Hodgson observed the great flare of 1859 - Some very intense flares have been seen in white light against the disk of the sun, but these so-called "white light flares" are *very* rare as flares go, and the material ejected by them is, of course, not visible in a white light That was the point I was trying to make - that being pernickity you don't need H-alpha to see a flare, but you might wait a very long time to see one if you don't use it.. Agree wholly with all you have to say, of course. filter. During the peak of solar activity, I could observe almost every day or so for a few hours and see at least one small flare (and major flares once or twice per week) with my H-alpha filter, but none of these ever appeared in white light. Even some of the monster X-class flares I have watched have not quite passed into the white-light category. Clear skies to you. Not even the X28 (and possibly up to X45) flare last November? I was talking to some people a month or so ago at the European Geosciences Union meeting and it seems that Carrington's flare is now thought to have been significantly bigger than the 4th November 2003 event and might have been up in the X55-X60 range - this would fit in with it being clear as a white-light event. Interesting.. -- Andy Breen ~ Interplanetary Scintillation Research Group http://users.aber.ac.uk/azb/ Feng Shui: an ancient oriental art for extracting money from the gullible (Martin Sinclair) |
#14
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What is the distance of typical solar flares ??
ANDREW ROBERT BREEN posted:
Not even the X28 (and possibly up to X45) flare last November? I don't know, as I merely refer to the solar flares which I have seen (it was cloudy during one of those monsters, and the other occurred before sunrise here). A few I have seen have been up to around X5 to maybe X7, but none were much larger than this (most of the flares I routinely observer are C and M X-ray class events). The white light ones seem to be those of X10 or above, and they tend to be fairly rare. The other problem with observing the white-light emission is that it tends to be briefer than the flare's longevity in H-alpha (1 to 10 minutes typically). Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 11th Annual NEBRASKA STAR PARTY * * July 18-23, 2004, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#15
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What is the distance of typical solar flares ??
ANDREW ROBERT BREEN posted:
Not even the X28 (and possibly up to X45) flare last November? I don't know, as I merely refer to the solar flares which I have seen (it was cloudy during one of those monsters, and the other occurred before sunrise here). A few I have seen have been up to around X5 to maybe X7, but none were much larger than this (most of the flares I routinely observer are C and M X-ray class events). The white light ones seem to be those of X10 or above, and they tend to be fairly rare. The other problem with observing the white-light emission is that it tends to be briefer than the flare's longevity in H-alpha (1 to 10 minutes typically). Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 11th Annual NEBRASKA STAR PARTY * * July 18-23, 2004, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
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