Examination of Cadence of Solar Soft X-ray Flux on the Ionosphere and Thermosphere

Details Examination of Cadence of Solar Soft X-ray Flux on the Ionosphere and Thermosphere Examination of Cadence of Solar Soft X-ray Flux on the Ionosphere and Thermosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0273s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0273

Physics

2479 Solar Radiation And Cosmic Ray Effects, 3369 Thermospheric Dynamics (0358), 7538 Solar Irradiance

Scientific paper

The solar soft x-ray flux is crucial to modeling the thermosphere and ionosphere accurately. However, measurements of soft x-ray spectrum (0-10~nm) have been few and far between. As a result, the time variation of the spectrum has been tied to daily indices, such as F10.7 or E10.7. While this is adequate for long term studies such as seasonal, annual, or solar cycle variations, studies that address short-term effects such as geomagnetic disturbances or solar flares require a higher cadence input for a more proper driver of physics. With recent solar soft x-ray and EUV data available from the Solar Extreme ultraviolet Experiment (SEE) onboard the Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED) satellite, a complete spectrum is available, but only once every orbit (~97 minutes). In this paper, we examine the effects of varying the cadence in which high energy solar irradiance is input into the global thermosphere-ionosphere- electrodynamics general circulation model (TIE-GCM). Specifically, we compare once a day, once an orbit, and every minute cadence and the resulting ionospheric and thermospheric response. We use the observed solar spectrum from SEE/TIMED and combine the measurements from SEE with the 1-min Geostationary Oribiting Earth Satellite (GOES) Space Environment Monitor (SEM) hard x-ray flux to produce high cadence solar soft x-ray flux.

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