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| Titel |
Case studies of the propagation characteristics of auroral TIDS with EISCAT CP2 data using maximum entropy cross-spectral analysis |
| VerfasserIn |
S. Y. Ma, K. Schlegel, J. S. Xu |
| 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. 2 ; Nr. 16, no. 2, S.161-167 |
| Datensatznummer |
250013152
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| Publikation (Nr.) |
 copernicus.org/angeo-16-161-1998.pdf |
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| Zusammenfassung |
In this paper case studies of propagation
characteristics of two TIDs are presented which are induced by atmospheric
gravity waves in the auroral F-region on a magnetic quiet day. By means of
maximum entropy cross-spectral analysis of EISCAT CP2 data, apparent full
wave-number vectors of the TIDs are obtained as a function of height. The
analysis results show that the two events considered can be classified as
moderately large-scale TID and medium-scale TID, respectively. One exhibits a
dominant period of about 72 min, a mean horizontal phase speed of about 180 m/s
(corresponding to a horizontal wavelength of about 780 km) directed
south-eastwards and a vertical phase speed of 55 m/s for a height of about 300
km. The other example shows a dominant period of 44 min, a mean horizontal phase
velocity of about 160 m/s (corresponding to a horizontal wavelength of about 420
km) directed southwestwards, and a vertical phase velocity of about 50 m/s at
250 km altitude.
Key words. Ionosphere · Auroral ionosphere ·
Ionosphere-atmosphere interactions · Wave propagation) |
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