Analysis of bow shock transition parameters at Jupiter from 140 to 1000 RJ

Details Analysis of bow shock transition parameters at Jupiter from 140 to 1000 RJ Analysis of bow shock transition parameters at Jupiter from 140 to 1000 RJ

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12811r&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12811

Computer Science

Scientific paper

From late December 2000 Cassini spent over three months skimming the dusk flank of the jovian magnetosheath, including 52 crossings of the planetary bow shock, with the last planetary shock encounter occurring 980 R_J downtail. The bow shock was often encountered several times in a few hours which is indicative of the prompt reaction time of this boundary to changes in the solar wind conditions. We present an analysis of up and downstream temperature, density, magnetic field, shock normal direction and shock speed and how these parameters vary with distance downtail. This utilises a combined dataset from the Cassini plasma spectrometer (CAPS) and magnetometer (MAG). All of the bow shocks were high Mach number shocks. The average transition in temperature (T_d/T_u) was 1.15; density (n_d/n_u) 2.32; and in magnetic field magnitude (B_d/B_u) 2.05. We also compare the variation in the ratio of these parameters with the difference in the up and downstream parameters (eg. T_d-T_u), following earlier work on the Earth's bow shock by M. Thomsen et al. [1987]. We find that in general the magnitude of the transition from up to downstream decreases with distance downtail, indicative of the magnetosheath plasma becoming less compressed and accelerating toward the upstream solar wind speed. We also present some simple comparisons of the observed transitions to those predicted by shock jump theory and discuss the potential of this as a check for derived values from the Cassini plasma instruments.

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