Remote Sensing of the Lower Thermosphere by Solar X-ray Imaging During Occultations

Details Remote Sensing of the Lower Thermosphere by Solar X-ray Imaging During Occultations Remote Sensing of the Lower Thermosphere by Solar X-ray Imaging During Occultations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa13a1089h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA13A-1089

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0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 0360 Radiation: Transmission And Scattering, 3369 Thermospheric Dynamics (0358)

Scientific paper

Occultations of the Sun by Earth as viewed by a soft X-ray imager offer unique insight into the structure of the lower thermosphere (100-400 km). An initial analysis of GOES-12 Solar X-ray Imager (SXI) data demonstrated the utility of this technique, particularly the ability to instantaneously gain spatially resolved (better than 10km resolution) transmission measurements both in altitude and latitude. The GOES-13 SXI was launched in May 2007 and marks a significant improvement over the previous instrument in terms of spatial resolution, sensitivity, and reduced wide-angle scattering. We analyze GOES-13 observations from September 2006 and compare them to GOES-12 observations in terms of signal-to-noise, background levels, and apparent small-scale spatial structure. The transmission observations are modeled using the NRLEUV solar spectral model and the MSIS neutral atmosphere, both driven by the F10.7 solar activity proxy, and then convolved with the SXI response function. Discrepancies between the model and observations are investigated with regard to thermospheric cooling models and other observations of thermospheric density by independent means. The SXI thermospheric data are highly accurate because they are "self-calibrating" relative measurements. Sustained, long-term SXI observations are assured since the SXI program and the Solar Ultraviolet Imager (SUVI) follow-on are planned to operate through 2030. Thus, these observations will offer a valuable measure of cyclic and secular changes in the thermosphere over multi-year to decadal time-scales.

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