Fine structure of subauroral electric field and electron content
作者： Roman A. Makarevich , W. A. Bristow
DOI: 10.1002/2014JA019821
关键词: Total electron content 、 Super Dual Auroral Radar Network 、 Electric field 、 Convection 、 Geodesy 、 Polarization (waves) 、 Geophysics 、 Geomagnetic storm 、 TEC 、 Ionosphere 、 Physics
摘要: Small-scale structure of the plasma convection and electron content within subauroral polarization stream (SAPS) is investigated. We present ionospheric observations during main phase geomagnetic storm on 17 March 2013, which a sequence intense, highly localized, fast-moving electric field (EF) structures SAPS was observed by Super Dual Auroral Radar Network Christmas Valley West (CVW) radar. The CVW EF measurements at 60 s resolution are analyzed in context coincident GPS total (TEC) 30 resolution. strong narrow feature ion drift (SAID) poleward TEC trough, with enhancement (peak) seen region. wave activity commenced ~2 h (15 min) after first appearance (SAID). appeared near edge propagated westward, merged SAID peak. propagation velocity comparable each structure. exhibited general decrease toward end period. On smaller time scale, small but appreciable structures. wavelet spectra showed similar variations, period ~5 min onset increasing to 8–10 significant activity. A scenario discussed, may modify conductance scales, large-scale magnetosphere-ionosphere feedback acting continuously deplete where/when such does not occur.
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