Observations of O+ in the Distant Tail from the STEREO B Spacecraft

Details Observations of O+ in the Distant Tail from the STEREO B Spacecraft Observations of O+ in the Distant Tail from the STEREO B Spacecraft

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm41a..06k&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM41A-06

Physics

2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

During the month of February, 2007, the STEREO B spacecraft traversed the dusk-side magnetotail, from -100 Re to -300 Re. This month was relatively quiet, with minimum Dst never below -39, and less than -20 for most of the month. Throughout this time, bursts of energetic O+ ions with energies up to 80 keV were observed using the Plasma and Suprathermal Ion Composition (PLASTIC), instrument. The O+ bursts are normally observed during time periods when density was low and the Bx component of the magnetic field changed orientation, indicating that the spacecraft was in the plasma sheet, crossing the neutral sheet. The energy of the bursts was highest for the highest solar wind speeds. During the most energetic events, O++ was also observed, simultaneous with the O+. These results show that the ionosphere can be a significant source for the plasma sheet, even in the deep tail during quiet times.

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