Reflected ions at interplanetary shocks

Details Reflected ions at interplanetary shocks Reflected ions at interplanetary shocks

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3712105r&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 12, CiteID L12105

Physics

1

Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Heliosphere/Interstellar Medium Interactions, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Coronal Mass Ejections (7513)

Scientific paper

This paper shows that the shock dissipation mechanism changes profoundly from the inner to outer heliosphere and that pickup ions are responsible for shock dissipation beyond 35 AU. We make the first study of reflected ions in ICME sheaths downstream of interplanetary shocks observed by Voyager 2 from 1-80 AU. A reflected ion population was present in 12 of 14 ICME sheaths inside 35 AU and in 0 of 6 sheaths outside 35 AU. Reflected ions comprised from 0-47% of the downstream ions. The ratio of the reflected to thermal ion temperature ranges from 2.6 to 9.3. The percent of reflected ions increases with sonic Mach number and the ratio of the reflected to thermal ion temperature increases with the speed jump at the shock. Energetic neutral atoms created from the heated pickup ions may be observable by IBEX.

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