MHD modeling applied to Giotto encounter with comet P/Grigg-Skjellerup

Details MHD modeling applied to Giotto encounter with comet P/Grigg-Skjellerup MHD modeling applied to Giotto encounter with comet P/Grigg-Skjellerup

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821009s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,009-21,016

Astronomy and Astrophysics

Astronomy

12

Astronomical Models, Grigg-Skjellerup Comet, Magnetohydrodynamic Flow, Magnetohydrodynamics, Plasma Interactions, Shock Wave Interaction, Solar Wind, Giotto Mission, Interplanetary Magnetic Fields, Mach Number, Mathematical Models, Spacecraft Trajectories, Three Dimensional Models, Trajectory Analysis

Scientific paper

First from a one-dimensional MHD model we derive estimates for position and shape of the bow shock applicable for arbitrary magnetosonic Mach numbers greater than 1 in the solar wind. This generalization is important in the case of the Giotto encounter with P/Grigg-Skjellerup with the unusual interplanetary magnetic field (IMF) of 18 nT. We compare three-dimensional model calculations with observations from six cometary missions and derive new corrected estimates for the gas production of P/Grigg-Skjellerup, which turn out to be substantially lower than those hitherto proposed assuming a large magnetosonic Mach number in the solar wind. Furthermore, we use global MHD models for this comet to determine from the measured magnetic field the position of the Gioto trajectory with respect to the comet. As a measure of the goodness of fit we use the mean square of the difference of the observed and the model field. We fit segments of the measured data of three different lengths centered near closest approach and for three different values of the unperturbed IMF. For all parameteters considered, we find a unique best approximating trajectory which depends only little on the parameters. In any case, our best fitting trajectory passes through the comet at the side of the nucleus nearly straightly eastward (within +/- 15 deg) at a distance of 400 km. It has closest approach at about 1518:59 space craft event time (SCET).

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