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• W2079683691 startingPage "15" @default.
• W2079683691 abstract "A simple model of the motion of charged particles in the closed field line magnetic field for L ≲ 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 Å 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. One occurs in the region 10–20°E and 40–50°S, with L ≈ 2, and the second near 30°E and 65°S, with L ≈ 4.5. Approximately 0.04 erg cm−2 sec−1 are deposited by 40 keV electrons for 50 per cent of the time in the first region and half that amount in the second. This increases to ∼0·1 and 0·02 erg cm−2 sec−1 respectively for 15 per cent of the time for near sunspot minimum conditions. The results show a gradual increase in precipitation 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 ∼f35 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." @default.
• W2079683691 created "2016-06-24" @default.
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• W2079683691 date "1975-01-01" @default.
• W2079683691 modified "2023-09-25" @default.
• W2079683691 title "Particle precipitation in the south atlantic geomagnetic anomaly" @default.
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• W2079683691 doi "https://doi.org/10.1016/0032-0633(75)90064-1" @default.
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