The Near-Nuclear Coma of Comet Halley in March 1986 |
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Authors: | Szegö Karoly Crifo Jean-François Rodionov Alexander V Fulle Marco |
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Institution: | (1) KFKI Research Institute for Particles and Nuclear Physics, P.O. Box 49, H-1525 Budapest, Hungary;(2) Service d'Aéronomie du CNRS, BP 3, F 91371 Verriéres le Buisson Cedex, France;(3) Central Research Institute on Machine Building (TsNIIMASCH), Russia;(4) Osservatorio Astronomico di Trieste, Via Tiepolo, 11, I-34131 Trieste, Italy |
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Abstract: | The cameras carried onboard the flyby missions to comet P/Halleyin 1986 imaged the near nuclear jet activity fromseveral spatial
directions. The observed, very structured near nucleardust jets were considered at that timeas the result of dust emission
from well localized active surface regions(without supporting 3-D model computations, however).Based on the first, recently
developed 3-D gas dynamical model ofP/Halley's activity,we have been shown that jet features can be reproduced assuming ahomogeneous
dusty icenucleus surface. The dust in the collisional near nuclear comais concentrated along the gas flow discontinuities
resulting from thecomplicated surface orography, creating the visual impression ofdust jets. We present here the results of
these calculations forthe near nucleus dust distributions,and we compare them with the direct observations made during thethree
Halley flybys (Vega 1, Vega 2, and Giotto). |
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Keywords: | 3-D gas dynamics dust jets P/Halley |
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