Particle precipitation in the South Atlantic geomagnetic anomaly

Details Particle precipitation in the South Atlantic geomagnetic anomaly Particle precipitation in the South Atlantic geomagnetic anomaly

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23...15t&link_type=abstract

Planetary and Space Science, vol. 23, Jan. 1975, p. 15-26.

Physics

2

Atlantic Ocean, Atmospheric Models, Electron Precipitation, Geomagnetism, Magnetic Anomalies, Charged Particles, Injun 3 Satellite, Northern Hemisphere, Particle Motion, Southern Hemisphere

Scientific paper

A simple model of the motion of charged particles in the closed-field-line magnetic field for L less than about 4.5 is used together with Injun 3 measurements of 40-keV precipitated electrons made in the northern hemisphere to estimate theoretically the extent of electron precipitation, the energy input, and the 3914-A airglow in the South Atlantic geomagnetic anomaly. Using average values of the northern hemisphere precipitated electron flux, two regions of significantly enhanced electron precipitation are found in the southern hemisphere. The results show a gradual increase in precipitation for near sunspot minimum conditions on the western side of the anomaly followed by a rapid increase and sudden cut-off in precipitation within a few degrees west of minimum B. The flux on L = 2 reaches a spike in the southern hemisphere about 35 times greater than the average flux precipitated on L = 2 in the northern hemisphere. This increase in precipitation arises from the loss of trapped particles to the atmosphere where the mirror heights are lowest.

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