ACE/SEPICA Observations of Energetic He+ Associated With Interplanetary Disturbances at 1AU

Details ACE/SEPICA Observations of Energetic He+ Associated With Interplanetary Disturbances at 1AU ACE/SEPICA Observations of Energetic He+ Associated With Interplanetary Disturbances at 1AU

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh61a0423k&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH61A-0423

Physics

2102 Corotating Streams, 2109 Discontinuities, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2114 Energetic Particles, Heliospheric (7514), 2152 Pickup Ions

Scientific paper

Solar Energetic Particle (SEP) events with unusually high abundance in He+ that have been observed between 1998 and 2000 with ACE/SEPICA have been investigated in detail. Usually He+/He2+ abundance ratio in the solar wind/corona is of the order of 10e-4. However during SEP events the He+/He2+ ratio can be closer to one. This survey has shown that the increase of the He+/He2+ abundance ratio coincides with the arrival of the shock (either driven by a CME or associated with a CIR) or a discontinuity. The analysis strongly suggests local acceleration of these ions and it is also shown that interstellar pickup ions are the main source for the He+ enhancement. We have identified the types of discontinuities which are predominantly associated with an increase of the He+/He2+ ratio. A representative sample of CMEs, CME-related disturbances as well as corotating/transient streams has been examined in detail. We have investigated the observed temporal and energy dependence of the He+/He2+ ratio at the disturbances and we will describe the implications for the acceleration of He+ pickup ions in the Heliosphere.

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