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|Title:||Characteristics of medium-scale traveling ionospheric disturbances observed near the Antarctic Peninsula by HF radar|
Milan, Steve, E.
Freeman, M. P.
Yukimatu, A. S.
|Publisher:||American Geophysical Union|
|Citation:||Journal of Geophysical Research: Space Physics, 2013, 118 (9), pp. 5830-5841|
|Abstract:||We present a survey of medium-scale traveling ionospheric disturbances (MSTIDs) observed by a Super Dual Auroral Radar Network HF radar located in the Falkland Islands between May 2010 and April 2011. The radar has a ﬁeld of view that overlooks the Antarctic Peninsula, a known hot spot of gravity wave activity. We present observations of radar ground-backscatter data, in which the signatures of MSTIDs are manifested as structured enhancements in echo power. Observed periods were in the range 30–80 min, corresponding to frequencies of 0.2–0.6 mHz. Wavelengths were generally in the range 200–800 km and phase speeds in the range 100–300 m s[superscript –1]. These values are within the ranges typically associated with medium-scale gravity waves. We ﬁnd a primary population of northward (equatorward) propagating MSTIDs, which demonstrate an association with enhanced solar wind-magnetosphere coupling and a smaller, westward propagating population, that could be associated with atmospheric gravity waves excited by winds over the Andean and Antarctic Peninsula mountains or by the high winds of the Antarctic Polar Vortex.|
|Rights:||© 2013. American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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