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GEOPHYSICAL RESEARCH LETTERS,
VOL. 29,
1358,
4 PP., 2002
doi:10.1029/2001GL013579
Solar EUV flux, exospheric temperature and thermospheric wind inferred from incoherent scatter measurements of the electron density profile at Millstone Hill and Shigaraki
Center for Space Physics, Boston University, Boston, Massachusetts, USA
Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China
Center for Space Physics, Boston University, Boston, Massachusetts, USA
Department of Electric and Computer Engineering, Boston University, Boston, Massachusetts, USA
Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA
Radio Science Center for Space and Atmosphere, Kyoto University, Kyoto, Japan
We explore a method for inferring solar EUV flux, atmospheric composition and wind using ionospheric electron density Ne profile measurements. Incoherent scatter radar data from Millstone Hill and Shigaraki measured on October 5, 1989 are assimilated into a theoretical model whose driving forces, solar EUV flux, exosphere temperature Tex, and meridional wind, are adjustable. Adjustments are made to give best match between the model Ne profile and the data. The derived Tex values, found to be low near noon at Millstone and high in the afternoon at Shigaraki, are essentially those required to give the [O]/[N2] ratio necessary to fit the data. Our inferred EUV fluxes for the two sites are similar. Our technique of using profile data may resolve the ambiguity in deriving EUV and [O]/[N2] from electron-density measurements.
Published 15 May 2002.
Citation: (2002), Solar EUV flux, exospheric temperature and thermospheric wind inferred from incoherent scatter measurements of the electron density profile at Millstone Hill and Shigaraki, Geophys. Res. Lett., 29(9), 1358, doi:10.1029/2001GL013579.
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