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The dayside magnetopause moves inward during periods of southward interplanetary magnetic field in response to decreases in the outer magnetospheric magnetic field strength. We consider possible causes for the magnetic field strength decreases and demonstrate that they are consistent with increases in the region 1 Birkeland and cross-tail currents. We reexamine the well-known series of magnetopause crossings by OGO 5 on March 27, 1968, to demonstrate that they provide evidence for two intervals of gradual inward magnetopause motion associated with magnetic flux erosion and also for two intervals of inward magnetopause motion associated with sharp increases in the solar wind dynamic pressure.
Original language | English |
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Pages (from-to) | 13425-13436 |
Number of pages | 12 |
Journal | JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE |
Volume | 99 |
Issue number | A7 |
DOIs | |
State | Published - 1 Jul 1994 |
ID: 28014345