Unusual bow shock crossing events at Jupiter

Details Unusual bow shock crossing events at Jupiter Unusual bow shock crossing events at Jupiter

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm31c1124s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM31C-1124

Physics

2109 Discontinuities, 2139 Interplanetary Shocks, 2154 Planetary Bow Shocks, 7827 Kinetic And Mhd Theory

Scientific paper

The Cassini spacecraft on its way to Saturn explored the plasma environment of Jupiter near the ecliptic plane, on the dusk side of the planet. The first bow shock (BS) crossing took place on 30 December 2000, and it was followed by about 40 more bow shock crossing events in the distant flanks. The CAPS sensor onboard Cassini, dedicated to measure charged particle spectra up to 50 keV, monitored almost continuously these crossings. We classify a few of these as "unusual", because during those crossings the bulk plasma velocity between quiet upstream and quiet downstream conditions reached higher values than upstream in the unperturbed SW. Here we focus on these "unusual" events and we investigate in detail the plasma parameters as a function of time as Cassini crossed the Jovian bow shock. We use the measurements of the ion beam sensor (IBS) of CAPS and the data measured by the magnetometer, and the radio and plasma wave science (RPWS) instrument. One of the possible explanations we put forward here is that we possibly observed the interaction of interplanetary shocks with the bow shock of Jupiter. We summarize what is known in the literature for shock interactions, and we compare the observations with those models.

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