Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh31a1149k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH31A-1149
Physics
2102 Corotating Streams, 2109 Discontinuities, 2139 Interplanetary Shocks, 2152 Pickup Ions
Scientific paper
Recent observations with ACE/SEPICA and SOHO CELIAS STOF have shown that energetic He+ is after H+ and He2+ the third most abundant energetic particle population in the heliosphere. The He+/He2+ ratio in the energetic particle population can reach unusually high values; in the energy range of 250keV/n -800keV/n ratios close to unity. The major source of the energetic He+ has been identified to be interplanetary pickup ions that are preferentially accelerated at CIR's, TIR's, and interplanetary traveling shocks. Since, compared to solar wind ions pickup ions are already suprathermal, any accelerator can create an enhancement in the energetic He+/He2+ ratio. In our survey of energetic helium over three years (1998-2000) from STOF and SEPICA we have identified additional discontinuities and magnetic field signatures, such as current sheet crossings, flows, and enhanced magnetic turbulence, which are associated with an enhancement in He+/He2+ ratio.
Bochsler Peter
Farrugia Charles
Galvin Antoinette
Hilchenbach Martin
Klecker Berndt
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