Nonthermal ions and associated magnetic field behavior at a quasi-parallel earth's bow shock

Details Nonthermal ions and associated magnetic field behavior at a quasi-parallel earth's bow shock Nonthermal ions and associated magnetic field behavior at a quasi-parallel earth's bow shock

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3889w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3889-3905.

Other

9

Bow Waves, Earth Atmosphere, Geomagnetism, Ion Beams, Shock Wave Propagation, Ampte (Satellites), Specular Reflection

Scientific paper

Attention is given to ion and magnetic field measurements at the earth's bow shock from the AMPTE-UKS and -IRM spacecraft, which were examined in high time resolution during a 45-min interval when the field remained closely aligned with the model bow shock normal. Dense ion beams were detected almost exclusively in the midst of short-duration periods of turbulent magnetic field wave activity. Many examples of propagation at large elevation angles relative to the ecliptic plane, which is inconsistent with reflection in the standard model shock configuration, were discovered. The associated waves are elliptically polarized and are preferentially left-handed in the observer's frame of reference, but are less confined to the maximum variance plane than other previously studied foreshock waves. The association of the wave activity with the ion beams suggests that the former may be triggered by an ion-driven instability, and possible candidates are discussed.

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