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| Titel |
Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
| VerfasserIn |
A. Mikhailov, K. Schlegel |
| 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 ; 15, no. 3 ; Nr. 15, no. 3, S.314-326 |
| Datensatznummer |
250012668
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| Publikation (Nr.) |
 copernicus.org/angeo-15-314-1997.pdf |
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| Zusammenfassung |
| A theoretical self-consistent method for the
description of daytime Ne(h) profiles in the ionospheric F
region measured by EISCAT is proposed. It is based on the use of a theoretical
F-region model and measured electron density, Ne(h),
electron, Te(h), and ion temperature, Ti(h),
and field-aligned plasma drift Vl(h) profiles. The method
describes the observed Ne(h) profile with high accuracy for
quiet and disturbed conditions. Two versions of the method are considered: in
the first the exospheric temperature Tex is derived
from a procedure minimizing [log(Ne(h)obs / Ne(h)cal]2, in the second Tex is deduced from the ion energy
conservation in the F region. The method allows us to infer from the
incoherent-scatter observations: concentrations of atomic oxygen, [O], molecular
oxygen, [O2], molecular nitrogen, [N2]
the vertical plasma drift, W, the exospheric temperature. Tex, and the shape parameter S in the neutral
temperature profile. The ratio ([O+]/Ne) calculated
by the theoretical model is used to correct Te(h), Ti(h) and Ne(h)
profiles routinely measured with EISCAT which are known
to depend strongly on the actual applied ion-composition model. Such a
correction is especially important for geomagnetically disturbed periods when
the F region is strongly enriched with molecular ions. We conclude that four of
the six thermospheric parameters, namely [O], [N2], W and Tex can be
confidently inferred from the EISCAT observations, while the other two derived
parameters, [O2] ans S are less reliable.
The method can be used for the analysis of long-term (seasonal, solar cycle) as
well as for day-to-day variations of the thermospheric parameters and the
F-region ion composition using daytime incoherent-scatter observations. |
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