On the origin of hot diamagnetic cavities near the earth's bow shock

Details On the origin of hot diamagnetic cavities near the earth's bow shock On the origin of hot diamagnetic cavities near the earth's bow shock

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311311t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 1, 1988, p. 11311-11325. Research sponsored by the Lockheed Inde

Physics

57

Atmospheric Physics, Bow Waves, Diamagnetism, Shock Waves, Cavities, Electron Distribution, High Temperature Plasmas, Interplanetary Medium, Ion Motion, Specular Reflection

Scientific paper

The origin of hot diamagnetic cavities (HDCs) observed occasionally upstream from the earth's bow shock is investigated by examining the results of November 16, 1977, observation, when four of these events occurred on a single day, as well as plasma and field data from that day. The results suggest that HDCs may form as a result of an unusually strong interaction between shock-reflected ions and the incoming solar wind. It is proposed that this interaction stems from a temporary and localized reflection of a larger-than-normal fraction of the incident ions, which is stimulated by sudden changes in the upstream field orientation; the consequences of such a temporary overreflection are found to be consistent with many of the observed features of HDCs, including the strong slowing, deflection, and heating of the flow, as well as the localization, internal recoveries, and occasional formation upstream from the shock itself.

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