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| Titel |
Letter to the editor: Electric field fluctuations (25-35 min) in the midnight dip equatorial ionosphere |
| VerfasserIn |
J. Hanumath Sastri, H. Lühr, H. Tachihara, T.-I. Kitamura, J. V. S. V. Rao |
| 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 ; 18, no. 2 ; Nr. 18, no. 2, S.252-256 |
| Datensatznummer |
250013914
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| Publikation (Nr.) |
 copernicus.org/angeo-18-252-2000.pdf |
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| Zusammenfassung |
Measurements with a HF Doppler sounder at
Kodaikanal (10.2°N, 77.5°E, geomagnetic latitude 0.8°N) showed conspicuous
quasi-periodic fluctuations (period 25-35 min) in F region vertical plasma
drift, Vz in the interval 0047-0210 IST on the night of 23/24
December, 1991 (Ap = 14, Kp < 4-).
The fluctuations in F region vertical drift are found to be coherent with
variations in Bz (north-south) component of interplanetary
magnetic field (IMF), in geomagnetic H/X components at high-mid
latitude locations both in the sunlit and dark hemispheres and near the dayside
dip equator, suggestive of DP2 origin. But the polarity of the electric field
fluctuations at the midnight dip equator (eastward) is the same as the dayside
equator inferred from magnetic variations, contrary to what is expected of
equatorial DP2. The origin of the coherent occurrence of equatorial electric
field fluctuations in the DP2 range of the same sign in the day and night
hemispheres is unclear and merits further investigations.
Key words: Ionosphere (electric fields and currents;
equatorial ionosphere; ionosphere-magnetosphere interactions) |
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