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Solor flares and radio propogation
Am I alone in finding e-mails like this almost completely undecipherable?
I'm afraid, reading them when I do first thing in the morning, unless they are explained rather better than a "flare being an X 28" I just skip over these mails and delete them. Please would sometime explain the following report to me in simple English: "Friday, November 07, 2003 Jonathan Marks has passed on this announcement from the European Space Agency: It has just been announced that the massive solar X-ray flare which occurred on 4 November was, at best estimate, an X28. There is still a small chance this will be revised by a small amount, but it is now official: We have a new number 1 X-ray flare for the record books, the most powerful in recorded observational history. For more information, see http://www.esa.int/export/esaSC/SEMN...D_index_0.html http://medianetwork.blogspot.com/ " Many thanks Mike |
#2
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I never pay to much attention to that stuff either. Generally if I want to check
conditions I just check the following page: http://www.n3kl.org/ And then go from there. The only other propagation thing I ever use is the '28 day rule', i.e., if conditions are very good on a certain day, then in many instances they will be very good 28 days later... sometimes! :-) Steve Holland, MI Drake R7, R8 and R8B http://www.iserv.net/~n8kdv/dxpage.htm Mike Terry wrote: Am I alone in finding e-mails like this almost completely undecipherable? I'm afraid, reading them when I do first thing in the morning, unless they are explained rather better than a "flare being an X 28" I just skip over these mails and delete them. Please would sometime explain the following report to me in simple English: "Friday, November 07, 2003 Jonathan Marks has passed on this announcement from the European Space Agency: It has just been announced that the massive solar X-ray flare which occurred on 4 November was, at best estimate, an X28. There is still a small chance this will be revised by a small amount, but it is now official: We have a new number 1 X-ray flare for the record books, the most powerful in recorded observational history. For more information, see http://www.esa.int/export/esaSC/SEMN...D_index_0.html http://medianetwork.blogspot.com/ " Many thanks Mike |
#3
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"Mike Terry" wrote:
Am I alone in finding e-mails like this almost completely undecipherable? Please would sometime explain the following report to me in simple English: Sure. Here goes: It has just been announced that the massive solar X-ray flare which occurred on 4 November was, at best estimate, an X28. There is still a small chance this will be revised by a small amount, but it is now official: We have a new number 1 X-ray flare for the record books, the most powerful in recorded observational history. An X-ray flare is a sudden, rapid, and intense variation in brightness, with an associated X-ray component (every flare, to my knowledge, will therefore be an X-ray flare - hence, a solar flare is the same thing as an X-ray flare). A solar flare occurs when magnetic energy that has built up in the solar atmosphere is suddenly released. Radiation is emitted across virtually the entire electromagnetic spectrum, from radio waves at the long wavelength end, through optical emission to x-rays and gamma rays at the short wavelength end. When a flare's intensity is determined, it is classified using a letter, followed by a number, which tells us the specific intensity of the flare. X-ray flare intensity is measured in units of power per area or Watts per meters squared. Each letter (A, B, C, M or X) represents a certain numeric value and the numbers following the letter in the flare classification multiply that value. The numeric values of the letter classes a A = 1.0x10E-8 (W m-2) B = 1.0x10E-7 (W m-2) C = 1.0x10E-6 (W m-2) M = 1.0x10E-5 (W m-2) X = 1.0x10E-4 (W m-2) (the W m-2 means Watts per square meter) To determine the exact intensity of the flare you multiply the number in the x-ray classification of that flare by the value of its class listed above. For example, the X28 flare had an intensity of at least 28.0x10E-4 Watts per square meter. This X28 flare is the most intense on record. We began accurate records during the 1970's. So, there might have (and probably have been) more intense flares in the past, but this one is the new record holder since the 1970's. What all does that mean? Well, it was an event that caused complete shortwave radio blackout on the sunlit side of the Earth, and degraded somewhat the propagation of shortwave radio signals on the darkside of the Earth. Thankfully, this one was not directed straight at the Earth, but off away from the side of the visual sun. The X28-class flare was quite amazing to view. I have some images from SOHO at http://prop.hfradio.org/ if you'd like to see them. 73 de Tomas, NW7US (AAR0JA/AAM0EWA) -- : Propagation Editor, CQ/CQ VHF/Popular Communications Magazines : : http://hfradio.org/ -- http://prop.hfradio.org/ -- Brinnon, WA : : 122.93W 47.67N - CW / SSB / DIGITAL / DX-Hunting / Propagation : : A creator of solutions -- http://accessnow.com/ -- Perl Rules! : : Washington State MARS Emergency Operations Officer - (AAM0EWA) : : WA State Army MARS Webmaster for http://wa.mars.hfradio.org/ : : 10x56526, FISTS 7055, FISTS NW 57, A.R. Lighthouse Society 144 : |
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