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| Titel |
Incoherent scatter radar observations of AGW/TID events generated by the moving solar terminator |
| VerfasserIn |
V. G. Galushko, V. V. Paznukhov, Y. M. Yampolski, J. C. Foster |
| 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 ; 16, no. 7 ; Nr. 16, no. 7, S.821-827 |
| Datensatznummer |
250013342
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| Publikation (Nr.) |
 copernicus.org/angeo-16-821-1998.pdf |
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| Zusammenfassung |
Observations of traveling ionospheric
disturbances (TIDs) associated with atmospheric gravity waves (AGWs) generated
by the moving solar terminator have been made with the Millstone Hill incoherent
scatter radar. Three experiments near 1995 fall equinox measured the AGW/TID
velocity and direction of motion. Spectral and cross-correlation analysis of the
ionospheric density observations indicates that ST-generated AGWs/TIDs were
observed during each experiment, with the more-pronounced effect occurring at
sunrise. The strongest oscillations in the ionospheric parameters have periods
of 1.5 to 2 hours. The group and phase velocities have been determined and show
that the disturbances propagate in the horizontal plane perpendicular to the
terminator with the group velocity of 300-400 m s-1 that corresponds
to the ST speed at ionospheric heights. The high horizontal group velocity seems
to contradict the accepted theory of AGW/TID propagation and indicates a need
for additional investigation.
Key words. Ionosphere (wave propagation) · Meteorology
and atmospheric dynamics (waves and tides) |
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