Dynamic pressure model derived from an observation by Sakigake for Comet Halley on 31 December, 1985

Details Dynamic pressure model derived from an observation by Sakigake for Comet Halley on 31 December, 1985 Dynamic pressure model derived from an observation by Sakigake for Comet Halley on 31 December, 1985

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.149s&link_type=abstract

In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 149-153 (SEE N87-26714

Physics

Astronomical Models, Comet Tails, Dynamic Pressure, Halley'S Comet, Japanese Spacecraft, Radiation Pressure, Solar Wind, Coronal Holes, Interplanetary Magnetic Fields, Magnetic Storms, Neutral Sheets, Plasmas (Physics)

Scientific paper

An outstanding disconnection event (DE)-like knot was observed on 31 Dec. 1985 in P/Halley's tail. Analysis of the Sakigake/IMF data reveals that comet Halley did not encounter the heliospheric neutral sheet on the day, demanding a new explanation of the DE-like event. During this event, the comet encountered a high-speed solar wind from a coronal hole tongue of the Sun. The event can be explained by a dynamic pressure model, according to which the DE-like plasmoid was caused by a sudden increase in the dynamic pressure of the solar wind. A simulation result is found to support this interpretation. The dynamic pressure model for a comet can be compared with the mechanism of a possible geotail disturbance during a spacecraft triggered auroral substorm.

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