Journal
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume 69, Issue 17-18, Pages 2416-2427Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2007.04.012
Keywords
equatorial ionosphere; ionospheric irregularities; ionospheric dynamics; current systems; plasma waves and instabilities
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We present experimental evidence and modeling results which indicate that eastward thermospheric wind is the primary controlling factor of equatorial spread-F initiation in the post-sunset ionosphere. Eastward wind-driven Pedersen currents are able to polarize F-region density perturbations with westward tilting wavefronts into rapidly growing modes to trigger the formation of spread-F bubbles. The described process is so rapid that seeding requirements of spread-F initiation by external factors such as gravity waves are effectively eliminated. (c) 2007 Elsevier Ltd. All rights reserved.
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