Energetic Particles From the October/November 2003 Solar Events: Ulysses Observations

Details Energetic Particles From the October/November 2003 Solar Events: Ulysses Observations Energetic Particles From the October/November 2003 Solar Events: Ulysses Observations

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh51a..12m&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SH51A-12

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar

Scientific paper

The effects of the intense solar activity that occurred in October and November 2003 were clearly observed at the Ulysses spacecraft. At the time of these events, Ulysses was located 6 degrees north of the solar equator, 120 degrees west of the Sun-Earth line, at a radial distance of 5.23 AU from the Sun. Solar wind conditions at Ulysses prior to the period of enhanced solar activity were dominated by a pattern of recurrent high-speed/low-speed stream interactions typical of the declining phase of the solar cycle. Energetic particle fluxes were predominantly SIR-related. As a result of the increased activity, and the associated (I)CMEs, this pattern was temporarily disrupted. In this paper, we report on observations of energetic particles in the 1-20 MeV/nucleon range as measured by the COSPIN/LET instrument on board Ulysses. We use the anisotropy and composition signatures to investigate the likely source of the populations contributing to the increased particle fluxes observed in connection with the Oct/Nov 2003 solar activity, and to draw conclusions concerning the relative importance of SEP versus SIR/CIR sources.

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