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Plasma Injection at Synchronous Orbit and Spatial and Temporal Auroral Morphology

1976; American Geophysical Union; Volume: 81; Issue: 16 Linguagem: Inglês

10.1029/ja081i016p02805

2156-2202

R. H. Eather, S. B. Mende, R. J. R. Judge,

Geomagnetism and Paleomagnetism Studies

Journal of Geophysical Research (1896-1977)Volume 81, Issue 16 p. 2805-2824 Particles and Fields—Ionosphere Plasma Injection at Synchronous Orbit and Spatial and Temporal Auroral Morphology R. H. Eather, R. H. EatherSearch for more papers by this authorS. B. Mende, S. B. MendeSearch for more papers by this authorR. J. R. Judge, R. J. R. JudgeSearch for more papers by this author R. H. Eather, R. H. EatherSearch for more papers by this authorS. B. Mende, S. B. MendeSearch for more papers by this authorR. J. R. Judge, R. J. R. JudgeSearch for more papers by this author First published: 1 June 1976 https://doi.org/10.1029/JA081i016p02805Citations: 91AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Analysis of ATS 5 particle spectrograms and simultaneous meridian-scanning photometer data (keograms) obtained at the base of the ATS field line has revealed systematic relationships between temporal and spatial auroral morphology and particle injection events. The details of these relationships depend on previous injection events, the local time of the observatory with respect to current injection events, and the extent and magnitude of current injections. A persistent zone of weak aurora is related to steady plasma sheet drizzle, and the equatorward edge of this aurora delineates field lines threading the inner edge of the plasma sheet. Auroras associated with injection events superimpose on this preexisting pattern, with the lowest latitude of new precipitation (the injection boundary) depending on local time. In general, plasma energization is not required between the equatorial plane and the ionosphere to account for observed auroral intensities, although there are examples when such energization probably occurs. The data also indicate occasional occurrence of enhanced loss cone fluxes, a fact suggesting low-altitude field-aligned acceleration. 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