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| Titel |
Morphological aspects of a new type of counter electrojet event |
| VerfasserIn |
R. G. Rastogi |
| 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 ; 17, no. 2 ; Nr. 17, no. 2, S.210-219 |
| Datensatznummer |
250013673
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| Publikation (Nr.) |
 copernicus.org/angeo-17-210-1999.pdf |
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| Zusammenfassung |
The study describes the time and space
morphologies of a rather new type of counter electrojet event on the basis of
data from the excellent chain of magnetic and ionospheric observatories along
the Indo-Russian longitude sector. Abnormally large westward currents are
observed during almost the whole of the daytime hours on a series of days. These
events do not form any vortices in the current system and do not apparently seem
to be associated with tidal effects or any solar magnetosphere events or
geomagnetic disturbances. The existence of a westward electric field over the
equatorial ionosphere has been confirmed by the absence of an equatorial type of
sporadic E in the ionograms at Thumba precisely during the periods when
∆H at Trivandrum minus ∆H at Alibag is
negative. The equatorial F region anomaly was also absent on the counter
electrojet day. Such counter electrojet events during the northern winter months
of low solar activity years are suggested to be the result of the modified wind
system in the ionosphere associated with stratospheric warming events.
Key words. Geomagnetism and paleomagnetism (time
variations · diurnal to secular) · Ionosphere (electric fields and currents;
equatorial ionosphere) |
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