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In support of the Global Weather Central of the Air Weather Service, we have developed computer techniques to determine, in near real time, the equatorward boundary of the auroral oval using the data from the SSJ/3 sensors flown on board the DMSP satellites. The boundary is determined on both the morning and evening sides of the oval and in both northern and southern auroral zones. Three tests are used in the boundary determination, one on the evening side and two on the morning side of the auroral oval. On the evening side of the auroral zone, since low energy particles always are observed at the lowest latitude, the boundary is determined by testing the summed counts in the six channels of...
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The first reconnaissance of all the major planets of the Solar System culminated in the Voyager 2 encounter with Neptune in August 1989. Neptune itself was revealed as a planet with gigantic active storms in its atmosphere, and off-center magnetic field, and a system of tenuous, lumpy rings. Whereas only two satellites were known prior to the encounter, Voyager discovered six more. Triton, the largest satellite, was revealed as a frozen, icy world with clouds and layers of haze, and with vertical plumes of particles reaching five miles into the thin atmosphere. This latest Space Science Series volume presents the current level of understanding of Neptune, its riings, and its satellites, deri...