Extreme Ultraviolet Radiation Flux Changes and Total Electron Content Enhancement During Solar Flares

Details Extreme Ultraviolet Radiation Flux Changes and Total Electron Content Enhancement During Solar Flares Extreme Ultraviolet Radiation Flux Changes and Total Electron Content Enhancement During Solar Flares

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51c1961k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA51C-1961

Physics

[2400] Ionosphere, [2443] Ionosphere / Midlatitude Ionosphere, [2479] Ionosphere / Solar Radiation And Cosmic Ray Effects

Scientific paper

Solar flares induce sudden changes in X-ray irradiance and EUV flux. The possibility of a correlation between these changes and the daytime global value of total electron content (TEC) is investigated through the use of data from the GPS, SOHO, and GOES satellites. The Millstone Hill Incoherent Scatter Radar (ISR) is used to investigate the altitude stratification of the flare induced TEC enhancement. A study is conducted for the months of October 2002 and September 2005 as they had 329 and 114 flares, respectively. The amount of TEC enhancement due to a solar flare is found to be dependent on solar activity, solar flare strength, and the background TEC. On average, October 2002 had solar flares of less strength and higher solar activity. Flare effects were more evident in September 2005 which had on average, a small background TEC (10-15 TECu) and prominent (~2 TECu) TEC enhancements. In addition, a high and positive correlation between X-ray irradiance and EUV flux was seen during solar flare events. Through the comparison of the different data sets, it is found that the majority of the TEC enhancement is in the E and F regions (100-150 km) which corresponds to the portion of the ionosphere ionized by EUV radiation.

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