Global pattern of auroral ion precipitation - A review of the results from the Aureole-1 and Aureole-2 satellites
Abstract
The essential characteristics of the regions of auroral ion precipitation revealed by the French-Soviet ARCAD experiments are reviewed in the context of the distribution of the various hot plasma domains in the outer magnetosphere. These regions include: a narrowly localized zone for the near-noon direct penetration of magnetosheath protons in the dayside cusp and a continuous and homogeneous band of proton aurora all along the auroral oval due to adiabatic drift of plasmasheet protons in the magnetosphere. For the diffuse aurora, there is an additional soft ion component of less than 1 keV in the precipitation spectra observed at all local times. Low energy ion precipitation exists at the polar border of the nightside auroral oval, and a morning sector low-energy ion precipitation occurs at auroral and subauroral latitudes due to the differential eastward drift of particles after a substorm injection.
- Publication:
-
Journal of Geophysics Zeitschrift Geophysik
- Pub Date:
- 1983
- Bibcode:
- 1983JGZG...52..150C
- Keywords:
-
- Auroral Zones;
- Earth Magnetosphere;
- Particle Acceleration;
- Particle Precipitation;
- Electron Precipitation;
- Energy Spectra;
- European Space Programs;
- Ions;
- Magnetosheath;
- Protons;
- Satellite Observation