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| Titel |
Comparison of the characteristic energy of precipitating electrons derived from ground-based and DMSP satellite data |
| VerfasserIn |
M. Ashrafi, M. J. Kosch, F. Honary |
| 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 ; 23, no. 1 ; Nr. 23, no. 1 (2005-01-31), S.135-145 |
| Datensatznummer |
250015127
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| Publikation (Nr.) |
 copernicus.org/angeo-23-135-2005.pdf |
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| Zusammenfassung |
| Energy maps are important for ionosphere-magnetosphere coupling studies,
because quantitative determination of field-aligned currents requires
knowledge of the conductances and their spatial gradients. By combining
imaging riometer absorption and all-sky auroral optical data it is possible
to produce high temporal and spatial resolution maps of the Maxwellian
characteristic energy of precipitating electrons within a 240240
common field of view. These data have been calibrated by inverting EISCAT
electron density profiles into equivalent energy spectra. In this paper
energy maps produced by ground-based instruments (optical and riometer) are
compared with DMSP satellite data during geomagnetic conjunctions. For the
period 1995-2002, twelve satellite passes over the ground-based instruments'
field of view for the cloud-free conditions have been considered. Four of the
satellite conjunctions occurred during moderate geomagnetic, steady-state
conditions and without any ion precipitation. In these cases with Maxwellian
satellite spectra, there is 71% agreement between the characteristic
energies derived from the satellite and the ground-based energy map method. |
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