Rocket and satellite observations of energetic particle precipitation in relation to optical aurora
Abstract
The following matters are reviewed: relations between invariant latitude-time distributions of visible aurora and keV electron precipitation, the polar cap electron aurora, relations of the auroral oval to spacecraft measurements of energetic electrons, diffuse and discrete auroras, the average keV proton distribution in invariant latitude and time in relation to observations of hydrogen aurora, the observed large-scale coincidence of regions with proton and electron excited aurora, some characteristics of the keV proton distribution function in the upper ionosphere, the magnetic time dependence of the keV proton population in the upper ionosphere, relations between variations in keV proton and electron distributions, and some substorm effects. On the basis of the observational evidence presented a number of relevant physical processes are discussed and this discussion is summarized in the form of a rough model of the behaviour of the keV proton and electron populations in the magnetosphere.
- Publication:
-
Annales de Geophysique
- Pub Date:
- May 1974
- Bibcode:
- 1974AnG....30..223H
- Keywords:
-
- Auroras;
- Electron Precipitation;
- Proton Precipitation;
- Rocket Sounding;
- Satellite Observation;
- Upper Ionosphere;
- Auroral Absorption;
- Data Transmission;
- Energy Spectra;
- High Energy Electrons;
- Light Emission;
- Polar Caps;
- Polar Regions;
- Polar Substorms;
- Synoptic Measurement