Ionospheric and Thermospheric Effects During the Initial Radiative Phase of the Bastille Day Event

Details Ionospheric and Thermospheric Effects During the Initial Radiative Phase of the Bastille Day Event Ionospheric and Thermospheric Effects During the Initial Radiative Phase of the Bastille Day Event

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa51a08m&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA51A-08

Physics

0310 Airglow And Aurora, 0355 Thermosphere--Composition And Chemistry, 2419 Ion Chemistry And Composition (0335), 7538 Solar Irradiance, 7549 Ultraviolet Emissions

Scientific paper

Increases in the solar EUV and X-ray irradiance during a solar flare can produce enhanced ionization and heating in the terrestrial ionosphere. The resulting energetic photoelectrons in turn cause increases in the far ultraviolet (FUV) dayglow (100 - 150 nm). Enhancements of some 50 per cent had previously been detected in OGO-4 nadir-viewing data [C B Opal, Space Research XIII, 797, 1973]. Similar enhancements have now been seen in the FUV limb-viewing dayglow observations from the ARGOS satellite during the Bastille Day flare (July 14, 2000). Because extinction of the FUV dayglow by O2 prevents seeing below 140 km tangent altitude on the limb, increases in the dayglow above that altitude must be caused by the component of the flare spectral irradiance which is deposited there, namely at wavelengths greater than 20 nm. This conclusion is corroborated by the observation of the flare at 30.3 nm made by the SEM instrument on the SOHO satellite. We study this solar-ionospheric connection using a modified version of the NRL solar spectrum as input to the SAMI2 ionospheric model, and also calculate thermospheric heating rates for this event.

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