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| Titel |
First results from ground-based daytime optical investigation of the development of the equatorial ionization anomaly |
| VerfasserIn |
D. Pallam Raju, R. Sridharan, S. Gurubaran, R. Raghavarao |
| 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 ; 14, no. 2 ; Nr. 14, no. 2, S.238-245 |
| Datensatznummer |
250012173
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| Publikation (Nr.) |
 copernicus.org/angeo-14-238-1996.pdf |
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| Zusammenfassung |
| A meridional scanning OI 630.0-nm dayglow
photometer was operated from Ahmedabad (17.2°N dip lat.) scanning a
region towards the south in the upper atmosphere extending over ~5°
in latitude from 10.2°N to 15.2°N dip latitude. From the
spatial and temporal variabilities of the dayglow intensity in the scanning
region we show for the first time, evidence for the passage of the crest of the
equatorial ionization anomaly (EIA) in the daytime by means of a ground-based
optical technique. The relationship between the daytime eastward electric field
over the dip equator in the same longitude zone as inferred from the equatorial
electrojet strength and the evolutionary pattern of EIA is clearly demonstrated.
The latter as inferred from the dayglow measurements is shown to be consistent
with our present understanding of the electrodynamical processes in the
equatorial region. The present results reveal the potential of this ground-based
optical technique for the investigation of ionospheric/thermospheric phenomena
with unprecedented spatial and temporal resolution. |
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