Low altitude observations of dispersionless substorm plasma injections

Details Low altitude observations of dispersionless substorm plasma injections Low altitude observations of dispersionless substorm plasma injections

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9210063n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Sept. 1, 1987, p. 10,063-10,072.

Mathematics

Logic

13

Plasma Dynamics, Polar Substorms, Satellite Observation, Space Plasmas, Atmospheric Models, Dmsp Satellites, Magnetospheric Instability

Scientific paper

The substorm injection boundary model proposed by McIlwain (1974) and since adopted by many researchers describes the phenomenology of plasma introduction into the middle magnetosphere during a magnetic substorm: at the time of the substorm onset, both electrons and ions of all energies share a common earthward boundary. Such an injection should leave a clear signature in the auroral precipitation data. The Defense Meteorological Satellite Program (DMSP) F6 and F7 satellites were used to search for such signatures in the less than or equal to 30-keV auroral electron and ion data. Clear examples of an equatorward leap of the previously energy dependent equatorward cutoff in auroral precipitation to a cutoff boundary common to ions of all energies measured (i.e., dispersionless up to 30 keV) and electrons up to several keV (usually less than 10 keV) were observed in the near-midnight sector at a time corresponding to substorm onset. A collection of 10 such events occurring over a 1-month interval was studied, providing unusually direct confirmation that the phenomenological model of an initially dispersionless boundary accurately describes at least some injections. The DMSP data show the injection boundary to be dispersionless over a wide longitudinal range, but often only a dispersive injection is seen at dawn.

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