Thermal proton flow in the plasmasphere: The morning sector

Details Thermal proton flow in the plasmasphere: The morning sector Thermal proton flow in the plasmasphere: The morning sector

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22...79b&link_type=abstract

Planetary and Space Science, Volume 22, Issue 1, p. 79-94.

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Vertical profiles of electron density obtained in the vicinity of the plasmapause using the Alouette-II topside sounder have been analyzed to assess the presence of H+ flow in the topside ionosphere. The observations in the midnight sector show clearly the presence of the plasmapause; i.e. there is a sharp boundary separating the poleward regions of polar wind H+ flow and the more gentle conditions of the plasmasphere where light ions are present in abundance. In contrast, in the sunlit morning sector upwards H+ flow is deduced to be present to invariant latitudes as low as 48° (L = 2.2) in the regions normally known to be well inside the plasmasphere. The upwards H+ flux is sufficiently large (3 × 108 ions cm-2 sec-1) that the plasmapause cannot be seen in the latitudinal electron density contours of the topside ionosphere. The cause for this flow remains unknown but it may be a result of a diurnal refilling process.

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