Impact of the Bastille Day Solar Flare on the Low- to Mid-Latitude Ionosphere

Details Impact of the Bastille Day Solar Flare on the Low- to Mid-Latitude Ionosphere Impact of the Bastille Day Solar Flare on the Low- to Mid-Latitude Ionosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa21b0357h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA21B-0357

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2423 Ionization Mechanisms, 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting

Scientific paper

We study the impact of the Bastille Day solar flare radiation on the low- to mid-latitude ionosphere. The methodology is as follows. We develop an EUV irradiance spectrum based upon observations for the Bastille Day flare. Since solar irradiance observations typically do not have the cadence necessary to follow the evolution of a flare, we have developed techniques for computing flare spectra from the available solar data. We then use this spectrum in the NRL three-dimensional ionosphere model SAMI3 to obtain the global impact of the flare on the mid- to low-latitude ionosphere. We assess the flare's impact by comparing simulation results with and without the solar flare enhanced EUV spectrum. A previous study using the NRL two dimensional ionosphere model SAMI2 and a more simplistic EUV spectrum of the Bastille Day storm found that flare radiation can increase the F-region ionosphere density by up to 50% [Meier et al., Geophys. Res. Lett. 29, 10.1029/2001GL013956, 2002]. Research supported by ONR.

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