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| Titel |
Vertical and longitudinal electron density structures of equatorial E- and F-regions |
| VerfasserIn |
P. S. Brahmanandam, Y.-H. Chu, K.-H. Wu, H.-P. Hsia, C.-L. Su, G. Uma |
| 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. 1 ; Nr. 29, no. 1 (2011-01-10), S.81-89 |
| Datensatznummer |
250016949
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| Publikation (Nr.) |
 copernicus.org/angeo-29-81-2011.pdf |
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| Zusammenfassung |
| From global soundings of ionospheric electron density made with FORMOSAT
3/COSMIC satellites for September 2006–August 2009, day-night variations in
vertical and longitudinal structures of the electron densities in equatorial
E- and F-regions for different seasons are investigated for the first time.
The results reveal that the wavenumber-3 and wavenumber-4 patterns
dominated the nighttime (22:00–04:00 LT) F-region longitudinal structures in
solstice and in equinox seasons, respectively. In daytime (08:00–18:00 LT)
F-region, the wavenumber-4 patterns governed the longitudinal structures in
the September equinox and December solstice, and wavenumber-3 in March
equinox and June solstice respectively. A comparison of the daytime
and nighttime longitudinal electron density structures indicates that they
are approximately 180° out of phase with each other. It is believed that
this out of phase relation is very likely the result of the opposite phase
relation between daytime and nighttime nonmigrating diurnal tidal winds that
modulate background E-region dynamo electric field at different places,
leading to the day-night change in the locations of the equatorial plasma
fountains that are responsible for the formation of the F-region
longitudinal structures. Further, a good consistency between the locations
of the density structures in the same seasons of the different years for
both daytime and nighttime epochs has been noticed indicating that the
source mechanism for these structures could be the same. |
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