Quasi-perpendicular/quasi-parallel divisions of earth's bow shock

Details Quasi-perpendicular/quasi-parallel divisions of earth's bow shock Quasi-perpendicular/quasi-parallel divisions of earth's bow shock

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1697g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1697-1703.

Computer Science

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4

Bow Waves, Collisionless Plasmas, Geomagnetic Pulsations, Interplanetary Magnetic Fields, Solar Wind, Computer Graphics, Digital Simulation, Planetary Waves

Scientific paper

Computer-drawn diagrams of the boundaries between quasi-perpendicular and quasi-parallel areas of earth's bow shock are displayed for a few selected cone angles of static interplanetary magnetic field (IMF). The effect on the boundary of variable IMF in the foreshock is also discussed and shown for one nominal case. The boundaries demand caution in applying them to the realistic, dynamic conditions of the solar wind and in interpreting the effects of small cone angles on the distributions of structures at the shock. However, the calculated, first-order boundaries are helpful in defining areas of the shock where contributions from active structures inherent in quasi-parallel geometry may be distinguishable from those derived secondarily from upstream reflected ion dynamics. The boundaries are also compatible with known behavior of daytime ULF geomagnetic waves and pulsations according to models postulating that cone angle-controlled, time-dependent ULF activity around the subsolar point of the bow shock provides the source of geomagnetic excitation.

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