Guest Keith Woodard Posted March 13, 2014 Share Posted March 13, 2014 Good Day, I understand that just because you have an active sunspot region and there are strong solar flares or storms present, this fact does not always correlate to a CME event during that sunspot's life cycle. However, I have indications that there was a significant CME targeted at the earth today. Also do CME impact satellite radio and communications in the same way as other solar events? Can someone here confirm this assertion? Please go here for details on near real-time CGR activity monitoring: http://neutronm.bartol.udel.edu/realtime/thule.html Cheers, Keith Link to comment Share on other sites More sharing options...
Marcel de Bont Posted March 13, 2014 Share Posted March 13, 2014 Well, we are currently under the influence of a weak coronal hole high speed stream. The Wing Kp index observed values up to Kp 4 thanks to the direction of the IMF which was southward for a while. There are or were no CMEs aimed at Earth. Link to comment Share on other sites More sharing options...
Guest Keith Woodard Posted March 13, 2014 Share Posted March 13, 2014 Thank you for your prompt answer so what you are saying, the sudden and significant drop in CGRs is not from active CME activity? With all things being equal, I have read that CGRs or cosmic rays are fairly constant and only change from day to day based upon solar activity. We are dealing with sub-atomic particles that make their way past our magnetosphere to the lower atmosphere. Link to comment Share on other sites More sharing options...
Guest Australis Posted March 13, 2014 Share Posted March 13, 2014 Hello Keith, The dip in the graph, was an 'Forbush decrease'. If the neutron monitor shows a dip thats 5% lower that his 24 hours neutron measured background, an magnetic cloud (CME) is blokking the cosmic rays. The neutron monitor is very usefull instrument, to detect an CME that passed the earth. Satelliete communications do not have a lot problems with CME that passed the satellite. It is possible that the satelliet self is tumbling and crashed on the earth! On HF (shortwave) it is an other story, the X-ray's who comes from the flare, can be responseble for an HF fall-out. (of some parts of the world) Link to comment Share on other sites More sharing options...
Guest Keith Woodard Posted March 13, 2014 Share Posted March 13, 2014 Hello, This was what I thought but please read this: Well, we are currently under the influence of a weak coronal hole high speed stream. The Wing Kp index observed values up to Kp 4 thanks to the direction of the IMF which was southward for a while. There are or were no CMEs aimed at Earth. Cheers, Keith Link to comment Share on other sites More sharing options...
Tim De Blanck Posted March 13, 2014 Share Posted March 13, 2014 correct Link to comment Share on other sites More sharing options...
Guest Harry Twinotter Posted March 13, 2014 Share Posted March 13, 2014 Hello Keith, The dip in the graph, was an 'Forbush decrease'. If the neutron monitor shows a dip thats 5% lower that his 24 hours neutron measured background, an magnetic cloud (CME) is blokking the cosmic rays. The neutron monitor is very usefull instrument, to detect an CME that passed the earth. Satelliete communications do not have a lot problems with CME that passed the satellite. It is possible that the satelliet self is tumbling and crashed on the earth! On HF (shortwave) it is an other story, the UV light (flare) can make HF communications on some parts of the world, unusable for several hours. I think it is the X ray flux from solar flares that can affect HF radio, not the UV. X ray photons have enough energy to ionise the upper atmosphere, and affect the ionosphere. This is a useful graphic: http://www.swpc.noaa.gov/drap/index.html Link to comment Share on other sites More sharing options...
Marcel de Bont Posted March 14, 2014 Share Posted March 14, 2014 I am not an expert on this, but as far as I am aware both X-ray and Extreme UV (UV in the very shortest range) radiation ionize the upper atmosphere. Link to comment Share on other sites More sharing options...
Guest Australis Posted March 14, 2014 Share Posted March 14, 2014 @Harry Twinotter Youre right,I indeed made a mistake! (just corrected) I was confused, the extrem UV only influence the F1 and F2 layer, X-ray flux the D layer. [off-topic] @ Keith, the neutron monitor did detected a neutron decrease, so it was an CME for sure. (escaped end Februari??) Link to comment Share on other sites More sharing options...
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