Giotto magnetic field observations at the outbound quasi-parallel bow shock of Comet Halley

Details Giotto magnetic field observations at the outbound quasi-parallel bow shock of Comet Halley Giotto magnetic field observations at the outbound quasi-parallel bow shock of Comet Halley

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..463n&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, July-Aug. 1990, p. 463-471. Research supported by CNR, SERC, and BMFT.

Physics

20

Bow Waves, Giotto Mission, Halley'S Comet, Magnetic Field Configurations, Magnetohydrodynamic Turbulence, Magnetic Variations, Magnetometers, Shock Fronts, Wave Propagation

Scientific paper

The investigation of the outbound bow shock of Comet Halley using Giotto magnetometer data leads to the following results: the shock is characterized by strong magnetic turbulence associated with an increasing background magnetic field and a change in direction by 60 deg as one goes inward. In HSE-coordinates, the observed normal turned out to be (0.544, - 0.801, 0.249). The thickness of the quasi-parallel shock was 120,000 km. The shock is shown to be a new type of shock transition called a 'draping shock'. In a draping shock with high beta in the transonic transition region, the transonic region is characterized by strong directional variations of the magnetic field. The magnetic turbulence ahead of the shock is characterized by k-vectors parallel or antiparallel to the average field (and, therefore, also to the normal of the quasi-parallel shock) and almost isotropic magnetic turbulence in the shock transition region. A model of the draping shock is proposed which also includes a hypothetical subshock in which the supersonic-subsonic transition is accomplished.

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