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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 : |
#4
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tommyknocker wrote:
Stinger wrote: Mike, Here it is (the way I understand it). I've scanned those e-mails (and some of the sites as well) and the gist of the thing seems to be that they are using X-Ray emissions to measure how significant these flares are (and whether or not they're going to fry satellites). They assign an "X" with a digit as their shorthand to describe the relative strength of the flare. The consensus is an "X-20" is a pretty big one that can play havoc with power grids and long-range radio reception. However, another problem they have is that the orbital equipment they're using to measure these events can be overloaded by a truly big solar event. The satellite was overloaded and was not able to measure the really big flare last week, so they're having to rely on more subjective measures to try to figure out its real strength. I've seen numbers as high as X-45 for that one. Going further, there are two schools of thought on these recent solar events. The first is that the sun has been about three years overdue to have a major sunspot/flare cycle (they occur about every twelve years), and it is finally happening, just a little later than expected. The other (from the Art Bell crowd) is that the sun is being pelted by larger and larger comets foreshadowing the incoming orbit of a previously unknown planet (Planet X -- yeah, I know -- another "X") that drops into our solar neighborhood every three thousand years. I just know radio reception has been really spotty for the past three or so weeks ;^) -- Stinger I saw an article on alt.conspiracy apparently written by Whitley Strieber (the guy who wrote postapocalyptic novels before becoming an alien contactee). The basic gist of it was that a burst of some sort of energy from the core of the galaxy hit our sun, stopping the sun's magnetic field from entirely flipping over like it should have. This is allowing cosmic dust into our solar system, thus making the sun more unstable. He said that the 11 year solar cycle has been disrupted which will cause the end of civilization and etc. The article predicted that solar flares would keep increasing in number and intensity. (But as Tomas noted we've only been keeping records for 30 years, so there's a lot we don't know.) I suppose he (Strieber) got this information from his alien contacts. I think we should assume that solar events like the recent flares have occurred thousands of times during the sun's lifetime of at least 4-billion years. Since our lives are so short in comparison, we have a tendency to see such things as being new in the history of the sun, when in fact they are just new to us. To put it another way, given the huge age discrepancy between the sun and human lives, what are the odds that our sun has started a new phase in it's life just when we have developed the capability to observe these events with our science? I'd say those odds are slim to nil. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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