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| Titel |
Excitation of zero-frequency magnetic field-aligned currents by ionospheric heating |
| VerfasserIn |
A. V. Streltsov, T. R. Pedersen |
| 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 ; 29, no. 6 ; Nr. 29, no. 6 (2011-06-27), S.1147-1152 |
| Datensatznummer |
250017049
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1147-2011.pdf |
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| Zusammenfassung |
| Time-dependent, three-dimensional numerical simulations of the reduced MHD
model describing shear Alfvén waves in the magnetosphere provide an interesting
prediction superficially similar to results of several ionospheric heating
experiments conducted at high altitudes. In these experiments, heating of the
ionospheric F-region with a constant/zero-frequency beam of HF waves causes
luminous structures in the ionosphere in the form of a ring or a solid spot
with a characteristic size comparable to the size of the heated spot.
Simulations suggest that spots/rings or similar optical appearance might be
associated with a magnetic field-aligned current system produced by the
ionospheric heating. Two of the most interesting features of this current
system are (1) strong localization across the ambient magnetic field and (2)
distinctive non-symmetrical luminous signatures (ring/spot) in magnetically
conjugate locations in the ionosphere. |
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