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| Titel |
Enhanced E-layer ionization in the auroral zones observed by radio occultation measurements onboard CHAMP and Formosat-3/COSMIC |
| VerfasserIn |
C. Mayer, N. Jakowski |
| 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 ; 27, no. 3 ; Nr. 27, no. 3 (2009-03-10), S.1207-1212 |
| Datensatznummer |
250016450
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1207-2009.pdf |
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| Zusammenfassung |
| Particle precipitation of magnetospheric origin causes additional
ionization in the auroral zone at E-layer heights.
During night-time, in particular at winter-night, the E-layer
ionization may dominate over the F2-layer ionization level. To
study the geophysical conditions and characteristics of the related
ionospheric processes in more detail, we use GPS radio occultation
electron density profile retrievals from CHAMP and Formosat-3/COSMIC
to extract those vertical profiles which show the absolute maximum
of ionization in the E-layer height range of 90–150 km. In order to
select these profiles, we have developed an algorithm which can
recognize the shape of a given profile by fitting an empirical
Ansatz to it. Using data from CHAMP collected since 2002 and Formosat-3/COSMIC
data starting from 2006, we are able to study both, the local-time
dependence and the solar-cylce variability of the observed
processes. |
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