Comet Halley remote plasma tail observations and in situ solar wind properties - Vega-1/2 IMF/plasma observations and ground-based optical observations from 1 December 1985 to 1 May 1986

Details Comet Halley remote plasma tail observations and in situ solar wind properties - Vega-1/2 IMF/plasma observations and ground-based optical observations from 1 December 1985 to 1 May 1986 Comet Halley remote plasma tail observations and in situ solar wind properties - Vega-1/2 IMF/plasma observations and ground-based optical observations from 1 December 1985 to 1 May 1986

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..697d&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, May 1991, p. 697-708.

Other

16

Comet Tails, Halley'S Comet, Magnetic Field Configurations, Solar Activity Effects, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Solar Flares, Solar Wind, Vega Project, Comets, Halley, Comet Tails, Plasma, Solar Wind, Vega Missions, Shock, Spacecraft Observations, Earth-Based Observations, Magnetic Field, Density, Boundaries, Disconnection, Trajectories, Plasma Instrument, Mischa Instrument, Magnetic Effects, Polarity

Scientific paper

General features of the solar wind plasma and the interplanetary magnetic field (IMF) are studied for the time period of December 1, 1985 - May 1, 1986. Characteristics studied include corotating events, shocks, and sector boundaries in the IMF. For the same period, Comet Halley was near its perihelion and many ground-based observations of the plasma tail were made. They show interesting events such as tail substorms and disconnection events where the whole distant plasma tail seems to be disrupted from the part that is still attached to the cometary head. Several mechanisms have been produced to explain the cause of these events. The correlation between the IMF sector boundaries measured by Vega and the observed disconnection events are studied, noting that such a correlation would support the dayside reconnection explanation. It is found that only in 50 percent of the considered events does a correlation between these two phenomena exist. For the other cases, a sector boundary of the IMF sweeping over the comet cannot explain the occurrence of disruptions of the main plasma tail.

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