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Characteristics of medium-scale traveling ionospheric disturbances observed near the Antarctic Peninsula by HF radar

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journal contribution
posted on 08.04.2014, 09:24 by Adrian Grocott, K. Hosokawa, T. Ishida, Mark Lester, Steve Milan, M. P. Freeman, N. Sato, A. S. Yukimatu
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.

Funding

NERC grant NE/G019665/1, JSPS Invitation Fellowship (grant L11521)

History

Citation

Journal of Geophysical Research: Space Physics, 2013, 118 (9), pp. 5830-5841

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Journal of Geophysical Research: Space Physics

Publisher

American Geophysical Union

issn

2169-9380

eissn

2169-9402

Copyright date

2013

Available date

08/04/2014

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/jgra.50515/abstract

Language

en