Shock Events at Cassini Associated With the October-November 2003 Solar Flares

Details Shock Events at Cassini Associated With the October-November 2003 Solar Flares Shock Events at Cassini Associated With the October-November 2003 Solar Flares

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh32a..05h&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SH32A-05

Physics

2114 Energetic Particles, Heliospheric (7514), 2139 Interplanetary Shocks

Scientific paper

The huge solar events of late October and early November 2003, which had such a large impact on the Earth, produced interplanetary shocks that were also observed at 8.7 AU by Cassini some 10-15 days later. At least two shock-associated particle events were observed by the MIMI particle instruments with shocks arriving on Nov. 10 and Nov. 16, 2003. Cassini was about 65 degrees west of the sun-earth line, making the Nov. 2, X8.3, W56 flare closest to the Cassini sub-solar point. This presentation will emphasize the ion composition and energy spectra of these events, especially in the suprathermal 3-220 kev/e range measured by the MIMI/CHEMS spectrometer. The ion composition differs from that typically observed in events at 1 AU in that the heavier ions are dominated by accelerated interstellar pickup ions; namely, He+ and O+. We will use composition variations to assess the relative importance of solar and interstellar pickup seed particles. The Cassini spacecraft generally is oriented so that the solar wind cannot be detected directly. Therefore, away from the shocks, we will use the He+ cutoff energy to obtain an indirect measurement of the solar wind speed and thereby evaluate the degree of deceleration from 1 AU.

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