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| Titel |
On the origin of mesoscale TIDs at midlatitudes |
| VerfasserIn |
M. C. Kelley |
| 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. 2 ; Nr. 29, no. 2 (2011-02-21), S.361-366 |
| Datensatznummer |
250016975
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| Publikation (Nr.) |
 copernicus.org/angeo-29-361-2011.pdf |
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| Zusammenfassung |
| A recent breakthrough experiment by Ogawa et al. (2009) showed that
Mesoscale Traveling Ionospheric Disturbances (MSTIDs), a common phenomenon
at midlatitudes, originate in the auroral zone as gravity waves. Curiously,
however, the latter do not seem to be related to magnetic activity. These
atmospheric waves are common at high latitudes (Bristow and Greenwald, 1996;
Bristow et al., 1996), and we argue here that, as they propagate to lower
latitudes, Joule damping reduces the gravity wave spectrum to waves
suffering the weakest damping. The direction of weakest damping corresponds
to the direction predicted by the Perkins instability (Perkins, 1973) for
nighttime MSTIDs. The daytime features reported by Ogawa et al. (2009) are
very likely due to classical gravity wave interaction with the F-region
ionosphere. |
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