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Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity

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journal contribution
posted on 2014-04-08, 09:09 authored by Steve Milan, Adrian Grocott, S. de Larquier, Mark Lester, Tim Yeoman, M. P. Freeman, G. Chisham
We present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas region. This anomaly is thought to be produced by uplift of the ionosphere by prevailing equatorward thermospheric winds. Of particular interest are perturbations of the WSA-supported propagation, which suggest that during periods of geomagnetic disturbance, the ionospheric layer can be lowered by several tens of kilometers and subsequently recover over a period of 1 to 2 h. Perturbations can appear singly or as a train of two to three events. We discuss possible causes of the perturbations and conclude that they are associated with equatorward propagating large-scale atmospheric waves produced by magnetospheric energy deposition in the auroral or subauroral ionosphere. Changes in high/ middle latitude electrodynamics during geomagnetic storms may also account for the perturbations, but further modeling is required to fully understand their cause.

Funding

Natural Environment Research Council (NERC)NE/G019665/1

History

Citation

Journal of Geophysical Research: Space Physics, 2013, 118 (10), pp. 6608-6617

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

2014-04-08

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/jgra.50566/abstract

Language

en

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