The disconnection events of 1986 April 13-18 and the cessation of plasma tail activity in Comet Halley in 1986 May

Details The disconnection events of 1986 April 13-18 and the cessation of plasma tail activity in Comet Halley in 1986 May The disconnection events of 1986 April 13-18 and the cessation of plasma tail activity in Comet Halley in 1986 May

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..883y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 883-891.

Astronomy and Astrophysics

Astrophysics

9

Comet Tails, Halley'S Comet, Magnetoactivity, Solar Planetary Interactions, Solar Wind, Cometary Magnetospheres, Current Sheets, Interplanetary Magnetic Fields, Lines Of Force, Magnetic Field Configurations, Solar Magnetic Field

Scientific paper

The disconnection events (DEs) in the 1986 April 13-18 time period appear to be the last major ones of Comet Halley's 1986 apparition. We determined the time of the first disconnection event in this sequence, April 13.9 +/- 0.1 days, from kinematic analysis of photographic images. We show here that at the time of this DE, Comet Halley had just crossed a magnetic field sector boundary and was in a moderate-density solar wind region with a speed of approximately 350 km/s. A sequence of DEs began approximately 1 day after the April 13.9 DE and was easily visible on April 16 and 17. Based on IMP 8 data, we show that this sequence was associated with a complex magnetic structure of the solar wind, showing multiple reversals. It is thus plausible that the DEs in the April 13-18 time period were caused by magnetic reversals encountering the comet, in accordance with the front-side magnetic reconnection model of DEs by Niedner and Brandt (1978). Finally, we discuss the cessation of plasma tail activity in Comet Halley in 1986 May.

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