Post-onset development of the auroral absorption substorm in relation to magnetospheric electrons

Details Post-onset development of the auroral absorption substorm in relation to magnetospheric electrons Post-onset development of the auroral absorption substorm in relation to magnetospheric electrons

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..293c&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, March 1986, p. 293-299. Research supported by the Max-Planck-Gesellschaft

Computer Science

Auroral Absorption, Electron Precipitation, Ionospheric Propagation, Ionospheric Storms, Magnetospheric Electron Density, Magnetospheric Instability, Electron Flux Density, Energy Spectra, Geos 2 Satellite, High Energy Electrons, Ionospheric Drift, Riometers

Scientific paper

The behavior of the energetic electron precipitation in the postonset phase of an aurora absorption (AA) substorm is described on the basis of the dynamics of visible aurora and radio absorption in relation to electron measurements by the GEOS-2 satellite. The postonset activity is compared with the activity at the onset of the same substorm, reported earlier (Collins and Korth, 1983). Both the direction of propagation and the temporal development of the electron spectrum during the postonset phase of the AA substorm differ from those at the onset. The postonset velocities of the absorbing regions in the ionosphere have equatorward and eastward components, as opposed to the westward propagation at the onset. The maximum intensity of radio absorption during the postonset phase is associated with more intense fluxes of high energy electrons than at the onset, but with the superposition of a component softening with time, in direct contrast to the rapid hardening seen at the onset. The softening spectrum during the time of maximum absorption is interpreted as the arrival of a gradient-curvature drifting population.

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