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| Titel |
Observations of AGW/TID propagation across the polar cap: a case study |
| VerfasserIn |
H. T. Cai, F. Yin, S. Y. Ma, I. W. McCrea |
| 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. 8 ; Nr. 29, no. 8 (2011-08-12), S.1355-1363 |
| Datensatznummer |
250017070
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1355-2011.pdf |
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| Zusammenfassung |
| In this paper, we present observational evidence for the trans-polar propagation of
large-scale Traveling Ionospheric Disturbances (TIDs) from their
nightside source region to the dayside. On 13 February 2001, the 32 m dish of EISCAT Svalbard Radar (ESR) was
directing toward the geomagnetic pole at low elevation (30°) during the
interval 06:00–12:00 UT (MLT ≈ UT + 3 h), providing an
excellent opportunity to monitor the ionosphere F-region over the polar cap.
The TIDs were first detected by the ESR over the dayside north polar cap,
propagating equatorward, and were subsequently seen by the mainland UHF radar at
auroral latitudes around geomagnetic local noon. The propagation properties of the
observed ionization waves suggest the presence of a moderately large-scale TIDs, propagating across
the northern polar cap from the night-time auroral source during substorm conditions. Our
results agree with the theoretical simulations by Balthazor and
Moffett (1999) in which poleward-propagating large-scale traveling
atmospheric disturbances were found to be self-consistently driven by enhancements in
auroral heating. |
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