evidence for solar-production as a source of polar-cap plasma

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ID: 260372
2004
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Abstract
The focus of the study is a region of enhanced ionospheric densities observed by the EISCAT Svalbard radar in the polar F-region near local magnetic noon under conditions of IMF Bz<0. Multi-instrument observations, using optical, spacecraft and radar instrumentation, together with radio tomographic imaging, have been used to identify the source of the enhancement and establish the background ionospheric conditions. Soft-particle precipitation was ruled out as a candidate for the production. Tomographic observations identified a latitudinally restricted region of enhanced densities at sub-auroral latitudes, distinct from the normal mid-latitude ionosphere, which was likely to be the source. The evidence suggested that the increased sub-auroral densities were photoionisation produced at the equatorward edge of the afternoon high-latitude cell, where the plasma is exposed to sunlight for an extended period as it flows slowly sunward toward magnetic noon. It is proposed that this plasma, once in the noon sector, was drawn antisunward by the high-latitude convection toward polar latitudes where it was identified by the EISCAT Svalbard radar. The observations are discussed in terms of earlier modelling studies of polar patch densities.

Key words. Ionosphere (polar ionosphere; plasma temerature; plasma convection)
Reference Key
pryse2004annalesevidence Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;S. E. Pryse;R. W. Sims;J. Moen;J. Moen;L. Kersley;D. Lorentzen;W. F. Denig
Journal journal of food measurement and characterization
Year 2004
DOI
10.5194/angeo-22-1093-2004
URL
https://www.ann-geophys.net/22/1093/2004/angeo-22-1093-2004.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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