Low Energy Heavy Ion (C, O, Fe) Composition in the Inner Heliosphere by the Ulysses Spacecraft: 1992 to Present

Details Low Energy Heavy Ion (C, O, Fe) Composition in the Inner Heliosphere by the Ulysses Spacecraft: 1992 to Present Low Energy Heavy Ion (C, O, Fe) Composition in the Inner Heliosphere by the Ulysses Spacecraft: 1992 to Present

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33b..07m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH33B-07

Physics

2114 Energetic Particles (7514), 2162 Solar Cycle Variations (7536)

Scientific paper

We report a study of the long-term temporal and spatial dependence of the low energy (0.5 - 5 MeV/nucl) heavy ion (C, O, Fe) composition in the inner heliosphere (1.5 to 5.2 AU) from data acquired by the Wart detector in the Hi-SCALE instrument on the Ulysses spacecraft. During the interval from 1992 to the present Ulysses has made two complete six-year orbits over the solar poles to latitudes as high as 80 degrees north and south during both solar minimum and solar maximum conditions. The heavy ion composition provides data on the solar event-produced filling of the inner heliosphere during solar active conditions as well as the abundance of low energy (order 0.5 MeV/nucl) anomalous O during solar minimum in the declining phase of solar cycle 23. The low energy anomalous O (the lowest energy anomalous O measured by any spacecraft to date) during the minimum of cycle 23 is dramatically apparent in the displays of data by time and by composition ratio. The anomalous O spectrum is basically flat over the decade energy range 0.5 to 5 MeV/nucl. The Ulysses C, O, and Fe measurements -- both flux levels and composition ratios -- are compared to similar measurements from the HI-SCALE back-up instrument (EPAM) on the ACE spacecraft at 1 AU that began after ACE launch in August 1997.

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