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| Titel |
Localized electron density enhancements in the high-altitude polar ionosphere and their relationships with storm-enhanced density (SED) plumes and polar tongues of ionization (TOI) |
| VerfasserIn |
Y. Kitanoya, T. Abe, A. W. Yau, T. Hori, N. Nishitani |
| 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. 2 ; Nr. 29, no. 2 (2011-02-21), S.367-375 |
| Datensatznummer |
250016976
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| Publikation (Nr.) |
 copernicus.org/angeo-29-367-2011.pdf |
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| Zusammenfassung |
| Events of localized electron density increase in the high-altitude (>3000 km)
polar ionosphere are occasionally identified by the thermal plasma
instruments on the Akebono satellite. In this paper, we investigate the
vertical density structure in one of such events in detail using
simultaneous observations by the Akebono and DMSP F15 satellites, the
SuperDARN radars, and a network of ground Global Positioning System (GPS)
receivers, and the statistical characteristics of a large number (>10 000)
of such events using Akebono data over half of an 11-year solar cycle. At
Akebono altitude, the parallel drift velocity is remarkably low and the O+
ion composition ratio remarkably high, inside the high plasma-density
regions at high altitude. Detailed comparisons between Akebono, DMSP ion
velocity and density, and GPS total electron content (TEC) data suggest that
the localized plasma density increase observed at high altitude on Akebono
was likely connected with the polar tongue of ionization (TOI) and/or storm
enhanced density (SED) plume observed in the F-region ionosphere. Together
with the SuperDARN plasma convection map these data suggest that the TOI/SED
plume penetrated into the polar cap due to anti-sunward convection and the
plume existed in the same convection channel as the dense plasma at high
altitude; in other words, the two were probably connected to each other by
the convecting magnetic field lines. The observed features are consistent
with the observed high-density plasma being transported from the
mid-latitude ionosphere or plasmasphere and unlikely a part of the polar
wind population. |
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