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Spatial Development of the Dipolarization Region in the Inner Magnetosphere
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2018
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Source: Journal of Geophysical Research: Space Physics, 123(7), 5452-5463
[PDF-2.00 MB]
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Journal Title:Journal of Geophysical Research: Space Physics
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Description:The present study examines dipolarization events observed by the Van Allen Probes within 5.8REfrom Earth. It is found that the probability of occurrence is signi ficantly higher in the dusk-to- midnight sector than in the midnight-to-dawn sector, and it deceases sharply earthward. A comparison withobservations made at nearby satellites shows that dipolarization signatures are often highly correlated (c.c. >0.8) within 1 hr in magnetic local time (MLT) and 1 R EinRXY, and the dipolarization region expands earthward and westward in the dusk-to-midnight sector. The westward expansion velocity is estimated at0.4 hr (in MLT) per minute, or 60 km/s, which is consistent with the previously reported result for geosynchronous dipolarization. The earthward expansion is apparently less systematic than the westward
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Source:Journal of Geophysical Research: Space Physics, 123(7), 5452-5463
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ISSN:2169-9380;2169-9402;
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