Analysis of the Giacobini-Zinner bow wave

Details Analysis of the Giacobini-Zinner bow wave Analysis of the Giacobini-Zinner bow wave

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.461s&link_type=abstract

In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 461-465 (SEE N87-26714

Computer Science

Bow Waves, Flow Velocity, Giacobini-Zinner Comet, Magnetic Fields, Plasma Waves, International Sun Earth Explorer 3, Shock Waves, Solar Wind, Subsonic Flow, Supersonic Flow, Wave Propagation

Scientific paper

The cometary bow wave of P/Giacobini-Zinner has been analyzed using the complete set of ICE field and particle observations to determine if it is a shock. Changes in the magnetic field and plasma flow velocities from upstream to downstream have been analysed to determine the direction of the normal and the propagation velocity of the bow wave. The velocity has then been compared with the fast magnetosonic wave speed upstream to derive the Mach number and establish whether it is "supersonic", i.e., a shock, or "subsonic", i.e., a large amplitude wave. The various measurements have also been compared with values derived from a Rankine-Hugoniot analysis. The results indicate that, inbound, the bow wave is a shock with M = 1.5. Outbound, a subsonic Mach number is obtained, however, arguments are presented that the bow wave is also likely to be a shock at this location.

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