Neptune inbound bow shock

Details Neptune inbound bow shock Neptune inbound bow shock

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.1723s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A2, p. 1723-1730

Physics

8

Magnetohydrodynamics, Magnetosheath, Neptune (Planet), Shock Waves, Solar Wind, Space Plasmas, Least Squares Method, Magnetic Fields, Plasma Density, Plasma Temperature, Rankine-Hugoniot Relation, Scale Models, Upstream, Voyager 2 Spacecraft

Scientific paper

Voyager 2 crossed the inbound or upstream Neptunian bow shock at 1430 spacecraft event time on August 24 in 1989 (Belcher et al., 1989). The plasma and magnetic field measurements allow us to study the solar wind interaction with the outermost gas giant. To fully utilize all of the spacecraft observations, an improved nonlinear least squares, 'Rankine-Hugoniot' magnetohydrodynamic shock-fitting technique has been developed (Szabo, 1994). This technique is applied to the Neptunian data set. We find that the upstream bow shock normal points nearly exactly toward the Sun consistent with any reasonable large-scale model of the bow shock for a near subsolar crossing. The shock was moving outward with a speed of 14 +/- 12 km/s. The shock can be characterized as a low beta, high Mach number, strong quasi-perpendicular shock. Finally, the shock microstructure features are resolved and found to scale well with theoretical expectations.

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