Flare Rising Time and Duration: Modeling the Thermosphere and Ionosphere Response

Details Flare Rising Time and Duration: Modeling the Thermosphere and Ionosphere Response Flare Rising Time and Duration: Modeling the Thermosphere and Ionosphere Response

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa24a..06q&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA24A-06

Physics

[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2435] Ionosphere / Ionospheric Disturbances, [7949] Space Weather / Ionospheric Storms

Scientific paper

Solar flares are classified by their soft X-ray brightness as observed by GOES XRS (X-Ray Sensor). The soft X-ray fluxes observed by GOES XRS have been shown to accurately represent the EUV and FUV irradiance changes during a solar flare. We may expect that the peak amplitudes of neutral density and TEC responses may scale directly to the intensity of solar flares as classified by their X-ray brightness. Nevertheless, how will the duration of solar flares affect this possible relationship? How will the “Neupert effect”, or the strength of the EUV impulsive phase contributions based on the rise time of flares, changes the neutral density and TEC responses? We will use NCAR TIME-GCM model with the FISM flare spectra as the solar input to simulate neutral and electron density responses to flares with same intensity and same locations on the solar disk, but with different rising time and duration. Model results will be compared with CHAMP measurements and ground-based GPS TEC measurements. Diagnostic analysis of the model output will be carried out to examine roles of flare intensity, flare durations, and flare rise time in determining peak amplitude of neutral density and electron density responses, and to understand the physical and photochemical processes that determine contributions of flare classification, duration, and rise time to neutral and electron density responses.

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