A study of ULF wave foreshock morphology. I - ULF foreshock boundary. II - Spatial variation of ULF waves

Details A study of ULF wave foreshock morphology. I - ULF foreshock boundary. II - Spatial variation of ULF waves A study of ULF wave foreshock morphology. I - ULF foreshock boundary. II - Spatial variation of ULF waves

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1203l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 9, p. 1203-1213, 1215-1225.

Physics

27

Bow Waves, Earth Magnetosphere, Extremely Low Radio Frequencies, International Sun Earth Explorers, Magnetometers, Shock Waves, Interplanetary Magnetic Fields, Satellite-Borne Instruments, Solar Terrestrial Interactions, Solar Wind

Scientific paper

The forward boundary of the upstream ULF wave foreshock is investigated with magnetometer data from the ISEE observations. The technique consists of a statistical determination of the angle theta between the IMF and the bow shock normal of the boundary on the bow shock followed by a geometrical interpretation of the data over time. The forward boundary of the ULF wave foreshock is found to start where theta is approximately 50 deg, and the ion-reflection processes are found to be related to the cone angle of the interplanetary magnetic field (IMF). The structure of the region behind the foreshock is then examined by means of the spatial variation of ULF wave properties in two case studies. The changes in wave properties are assessed during periods in which the solar-wind conditions are relatively constant to determine depths from the foreshock boundary and distances from the bow shock. As the ISEE spacecraft travels downstream from the ULF foreshock boundary the ULF waves tend to become more linearly polarized and stronger.

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