Effect of the global neutral hydrogen distribution on the spatial structure and thermal balance in the upper ionosphere

Details Effect of the global neutral hydrogen distribution on the spatial structure and thermal balance in the upper ionosphere Effect of the global neutral hydrogen distribution on the spatial structure and thermal balance in the upper ionosphere

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1311k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1311-1320.

Physics

1

Scientific paper

A global numerical self-consistent and time-dependent model of the thermosphere, ionosphere and protonosphere (GSM TIP) was used to study the influence of atomic neutral hydrogen distribution in the exosphere on the upper ionosphere parameters for summer solstice conditions during high solar activity (F10.7 = 200). Theoretical model calculations were compared with measured ion and electron densities obtained by in situ observations along early morning and afternoon orbits of the satellite pair Active and Magion-2 on 31 July 1990. The satellites passed over Europe around 03:25 and 15:40 UT at an altitude of about 2000-2500 km during orbits 3805 and 3812. The numerical results were compared with O+, H+,Ne densities in the dawn sector and with the Ne concentration in the afternoon sector. We found that the atomic neutral hydrogen density is an essential model input parameter for upper ionosphere and plasmasphere studies. The inaccurate model input of the exospheric neutral hydrogen distribution can cause dramatic variations of the H+ density up to a factor of 2-4 and a 40% variation of the Ne concentration under the conditions of our study. On the other hand, the variability of the thermal latitudinal structure (Ti and Te) in the upper ionosphere in the altitude range from 2000 to 2500 km reaches only about 10-15%.

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