Plasma / Tail Activity at the Time of the VEGA Encounters

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Physical associations are sought between plasma-tail activity seen in ground-based imagery and near-comet, interplanetary magnetic field (IMF) measurements obtained by the Vega spacecraft. Emphasis is placed on Disconnection Events (DE's) and on testing the sector boundary/frontside magnetic reconnection model (Niedner and Brandt, 1978) of their origin. Strong support for the model comes from the spectacular DE whose onset, on 1986 March 7-8, is strongly correlated with a reversal of the comet's magnetic barrier observed by Vega-1 and Vega-2 at the encounters on March 6.3 and 9.3 UT, respectively, and with an IMF sector boundary observed by Vega-1 on March 7.9 UT. Additional work is needed to determine the possible role of solarwind plasma effects in producing the DE. Relationships between other occurrences of plasma-tail activity and Halley Armada spacecraft measurements remain to be explored.

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