Mathematics – Logic
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5727c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5727-5742.
Mathematics
Logic
86
Interplanetary Magnetic Fields, Magnetopause, Magnetosheath, Solar Wind, Surface Waves, Explorer 50 Satellite, Geomagnetic Tail, International Sun Earth Explorers, Kelvin-Helmholtz Instability
Scientific paper
On February 15, 1978, the orientation of the IMF remained steadily northward for more than 12 hours. Using plasma and magnetic field data from ISEE 1 and 2, IMP 8, and IMP 7, we show that (1) the magnetosheath flow speed on the flanks of the magnetotail steadily exceeded the solar wind speed by 20 percent, (2) surface waves of about 5-min period and very nonsinusoidal waveform were persistently present on the dawn magnetopause and waves of similar period were present in the dusk magnetosheath, and (3) the magnetotail ceased to flare at an antisunward distance of 15 earth radii. We propose that the acceleration of the magnetosheath flow is achieved by magnetic tension in the draped field configuration for northward IMP; the reduction of tail flaring is consistent with a decreased amount of open magnetic flux and a larger standoff distance of the subsolar magnetopause. Results of a 3D MHD simulation support this phenomenological model.
Chen Sheng-Hsien
Galland Kivelson Margaret
Gosling Jack T.
Lazarus Allan J.
Walker Raymond J.
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