Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2699c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 23, p. 2699-2702
Physics
35
Atmospheric Boundary Layer, Electric Fields, Interplanetary Magnetic Fields, Magnetopause, Magnetosheath, Surface Waves, International Sun Earth Explorers, Momentum Transfer
Scientific paper
We have examined International Sun Earth Explorer (ISEE) 1 and 2 data during an interval of multiple magnetopause crossings along the flanks of the tail on January 22, 1978. During the event the interplanetary magnetic field was mainly northward. We found that the surface waves on the magnetopause were nonsinusoidal with steepened sunward facing surfaces. This result is consistent with observations reported for an analogous event by Chen et al. (1993). The dawn-dusk electric field E in the low-latitude boundary layer was approx. 10 kV/R(sub E), which is much greater than the approx. 1 kV/R(sub E) dawn-dusk E field typical of the sunward convecting plasma sheet plasma. The ratio of the dawn-dusk E field in the LLBL to the dusk-dawn E in the magnetosheath was approx. 1/3. We propose that the magnetic field in the magnetosheath modulates the wave form in a way that may result in an anomalous transport of momentum across the magnetopause.
Chen Shan-Huai
Galland Kivelson Margaret
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