Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.1699l&link_type=abstract
Advances in Space Research, Volume 20, Issue 9, p. 1699-1708.
Computer Science
3
Scientific paper
It is well known that the ion composition of the F1-region is strongly affected by electric fields, electron precipitations and change in the neutral atmosphere composition. The transition altitude between molecular and oxygen ions can therefore be raised or lowered depending on local conditions. Ion composition measurements by the EISCAT facility during a substorm are presented. Emphasis is put on results obtained during a period of high electric field with a new analysis program of incoherent scatter spectra that allows for non-Maxwellian ion velocity distribution functions. These results are discussed in the light of numerical simulation, using TRANSCAR 1D-ionospheric model. This model couples a kinetic description of precipitating electrons with a fluid description of the thermal plasma (6 ions and electrons) and is therefore well adapted to a quantitative description of storm effects on the transition altitude between molecular and oxygen ions.
Blelly Pierre-Louis
Gaimard P.
Lathuillere Ch.
Lilensten Jean
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