Solar Flux and Thermospheric Conditions Inferred from Electron Density Profiles

Details Solar Flux and Thermospheric Conditions Inferred from Electron Density Profiles Solar Flux and Thermospheric Conditions Inferred from Electron Density Profiles

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52a04z&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52A-04

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2427 Ionosphere/Atmosphere Interactions (0335), 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting, 2479 Solar Radiation And Cosmic Ray Effects

Scientific paper

Rich information about the solar flux and neutral atmosphere is contained in ionospheric measurements. We have developed a method to assimilate incoherent scatter (IS) radar data of electron density into a theoretical model whose driving forces, the solar EUV flux, neutral winds, exospheric temperature Tex (therefore neutral composition and temperature) are adjustable. We adjust them to find best match of the model density to the data. In this presentation, we consider data obtained from two IS radars, the Millstone Hill radar and the Shigaraki MU radar, on the same day, October 5 1989 (with high solar activity and low geomagnetic activity), and apply the same assimilation method to them to derive the solar EUV flux as well as the exosphere temperature and meridional wind. It is found that the derived EUV fluxes are reasonably on the same level for both sites. The daytime Tex for Millstone Hill is about 1100-1400K, varying with time, similar to that given by other technique [Buonsanto and Pohlman, 1998] and basically 150K lower than the MSIS Tex, giving a 300-km [O]/[N2] about 20% greater than the corresponding MSIS value. For Shigaraki, however, the daytime Tex is as high as 1500-1700K, which is nearly 300K higher than the MSIS value, giving a 300-km [O]/[N2] about 20% smaller than the corresponding MSIS value. We also discuss the derived wind results for both sites.

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