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| Titel |
Statistics of Joule heating in the auroral zone and polar cap using Astrid-2 satellite Poynting flux |
| VerfasserIn |
A. Olsson, P. Janhunen  , T. Karlsson, N. Ivchenko, L. G. Blomberg |
| 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 ; 22, no. 12 ; Nr. 22, no. 12 (2004-12-22), S.4133-4142 |
| Datensatznummer |
250015079
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| Publikation (Nr.) |
 copernicus.org/angeo-22-4133-2004.pdf |
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| Zusammenfassung |
We make a statistical study of ionospheric Joule heating with the
Poynting flux method using six months of Astrid-2/EMMA electric and
magnetic field data during 1999 (solar maximum year). For the
background magnetic field we use the IGRF model. Our results are in
agreement with earlier statistical satellite studies using both the
ΣPE2 method and the Poynting flux method. We present a
rather comprehensive set of fitted Joule heating formulas expressing
the Joule heating in given magnetic local time (MLT) and invariant
latitude (ILAT) range under given solar illumination conditions as a
function of the Kp index, the AE index, the Akasofu epsilon parameter
and the solar wind kinetic energy flux. The study thus provides
improved and more detailed estimates of the statistical Joule
heating. Such estimates are necessary building blocks for future
quantitative studies of the power budget in the magnetosphere and in
the nightside auroral region.
Key words. Ionosphere (electric fields and currents;
ionosphere-magnetosphere interactions) – Magnetospheric
physics (magnetospheric configuration and dynamics) |
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