Physics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ssrv...17..205n&link_type=abstract
(IAU, IUGG, URSI, IUPAP, COSPAR, and SCOSTEP, International Solar-Terrestrial Physics Symposium, Sao Paulo, Brazil, June 17-24,
Physics
1
Auroras, Magnetospheric Instability, Polar Substorms, Solar Flares, Auroral Electrojets, Chromosphere, Electron Precipitation, Field Aligned Currents, Ionospheric Currents, Magnetic Field Configurations, Proton Precipitation
Scientific paper
The developmental morphology of auroral flares (magnetospheric substorms) for both electron and proton auroras is summarized in reference to the morphology of solar flares. The growth phase of an auroral flare is produced by the inflow of the solar wind energy into the magnetosphere by the reconnection mechanism between the solar wind field and the geomagnetic field. The onset of the expansion phase of an auroral flare is represented by the break-up of electron and proton auroras, which is associated with strong auroral electrojets, a sudden increase in CHA, VLF hiss emissions, and characteristic ULF emissions. The resultant field-aligned currents flowing between the tailward magnetosphere and the polar ionosphere produce the field-aligned anomalous resistivity owing to the electrostatic ion-cyclotron waves; the electrical potential drop thus increased further accelerates precipitating charged particles and intensifies field-aligned currents and the auroral electrojet.
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