Structure of the dayside magnetopause for low magnetic shear

Details Structure of the dayside magnetopause for low magnetic shear Structure of the dayside magnetopause for low magnetic shear

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813409p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,409-13,422.

Physics

93

Boundary Layers, Electron Energy, Magnetohydrodynamic Flow, Magnetopause, Plasma Density, Proton Energy, Anisotropy, Interplanetary Magnetic Fields, Magnetic Field Configurations

Scientific paper

Results of an analysis of 2 AMPTE/IRM satellite passes through the low-latitude magnetopause region for which the magnetic shear, i.e., the field rotation angle on transit from the magnetosheath to the magnetosphere, was less than 30 deg. On all passes a key time could be identified where the proton temperature, and usually also the electron temperature and the temperature anisotropies, show net and often discontinuous changes. Boundary layer durations varied widely, from 4 s to 14 min. On the magnetosheath side, a layer of plasma density depletion (by a factor of two or more) and concurrent magnetic field pile-up in less than half the crossings were observed. It is concluded that the changes in plasma thermal and flow properties at the key time mark the crossing of the magnetopause under conditions of low magnetic shear.

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