Magnetic field draping in the Comet Halley coma - Comparison of VEGA observations with computer simulations

Details Magnetic field draping in the Comet Halley coma - Comparison of VEGA observations with computer simulations Magnetic field draping in the Comet Halley coma - Comparison of VEGA observations with computer simulations

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..640s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, June 1987, p. 640-643.

Physics

12

Computerized Simulation, Halley'S Comet, Interplanetary Magnetic Fields, Magnetoplasmadynamics, Satellite Observation, Plasma Interactions, Solar Wind, Vega Project, Comets, Halley, Comae, Magnetic Fields, Spacecraft Observations, Models, Vega 1 Mission, Comparisons, Computer Methods, Simulations, Compression, Rotation, Magnetic Properties, Magnetohydrodynamics, Layers, Hypotheses, Solar Wind, Time Dependency, Flow, Mass Loading, Velocity

Scientific paper

During the Vega-1 encounter with Comet Halley, the magnetometer observed draping and compression of the interplanetary magnetic field. These are reproduced well by a three-dimensional MHD simulation of the cometary interaction. Rotations in the magnetic field similar to those at closest approach are also observed 2.75 hours earlier. It is suggested that both rotations correspond to the same IMF interval and that the spacecraft had overtaken the plasma and encountered 'older' magnetic field as it penetrated the coma. Analysis of the MHD model indicates that it should take about 3 to 5 hours for a solar wind parcel to pass from the unperturbed solar wind to Vega-1 at closest approach. A simulated magnetic field profile composed of nested sections for different IMF orientations closely resembles the observations. This result supports the hypothesis of layered magnetic orientations in the coma.

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