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| Titel |
Intriguing aspects of F-region plasma irregularities revealed by the Gadanki radar observations during the SAFAR campaign |
| VerfasserIn |
A. K. Patra, D. V. Phanikumar |
| 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 ; 27, no. 10 ; Nr. 27, no. 10 (2009-10-06), S.3781-3790 |
| Datensatznummer |
250016668
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3781-2009.pdf |
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| Zusammenfassung |
| Intriguing new results of F-region
irregularities observed using the Gadanki MST radar during the
SAFAR campaigns, which were conducted during the equinox and summer of 2008
that corresponds to low solar activity condition, are presented. The summer
observations are first of its kind from Gadanki. Observations revealed
remarkably different morphology of the F-region irregularities in summer
when compared to that in equinox. In summer, the F-region irregularities
were observed as horizontally stratified structures, while in equinox they
were observed as plume structures. Further, the irregularities in summer
commenced during the post-midnight hours in contrast to their commencement
in the post-sunset hours and occurrence extending to post-midnight hours in
equinox. In addition, an intriguing observation of the summer time
irregularities is that they occurred when the background electron density
was remarkably low as characterized by the disappearance of the F layer
trace in the ionograms. An interesting event of equinox that was observed
for 10 h and extended beyond the sunrise time displayed multiple plume
structures having periods similar to those of the E-region velocity
variations. These observations are discussed with due focus on the genesis
of post-midnight F-region irregularities and their possible linkage to the E-region dynamics. |
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