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| Titel |
Calibration of a numerical ionospheric model with EISCAT observations |
| VerfasserIn |
P.-L. Blelly, J. Lilensten  , A. Robineau, J. Fontanari, D. Alcaydé |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 12 ; Nr. 14, no. 12, S.1375-1390 |
| Datensatznummer |
250012503
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1375-1996.pdf |
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| Zusammenfassung |
| A set of EISCAT UHF and VHF observations is
used for calibrating a coupled fluid-kinetic model of the ionosphere. The data
gathered in the period 1200- 2400 UT on 24 March 1995 had various intervals of
interest for such a calibration. The magnetospheric activity was very low during
the afternoon, allowing for a proper examination of a case of quiet ionospheric
conditions. The radars entered the auroral oval just after 1900 UT: a series of
dynamic events probably associated with rapidly moving auroral arcs was observed
until after 2200 UT. No attempts were made to model the dynamical behaviour
during the 1900–2200 UT period. In contrast, the period 2200–2400 UT was
characterised by quite steady precipitation: this latter period was then chosen
for calibrating the model during precipitation events. The adjustment of the
model on the four primary parameters observed by the radars (namely the electron
concentration and temperature and the ion temperature and velocity) needed
external inputs (solar fluxes and magnetic activity index) and the adjustments
of a neutral atmospheric model in order to reach a good agreement. It is shown
that for the quiet ionosphere, only slight adjustments of the neutral atmosphere
models are needed. In contrast, adjusting the observations during the
precipitation event requires strong departures from the model, both for the
atomic oxygen and hydrogen. However, it is argued that this could well be the
result of inadequately representing the vibrational states of N2
during precipitation events, and that these factors have to be considered only
as ad hoc corrections. |
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