Injection and acceleration of He+ and He++ at quasi-parallel interplanetary shocks

Details Injection and acceleration of He+ and He++ at quasi-parallel interplanetary shocks Injection and acceleration of He+ and He++ at quasi-parallel interplanetary shocks

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3611k&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

In the energy range of 85-280 keV the abundance ratio of He+ to He++ shows large enhancements from ˜ 0.1 to 1 related to the passage of ME driven in-terplanetary travelling shocks (Klecker et. al., this Conference). In events with large enhancements the energy spectrum of He+ exhibits a super-thermal tail. A possible source for the superthermal population are pickup He+ ions, accel-erated at the interplanetary shock. Furthermore, the super-thermal He+ /He++ ratio at shock associated events is found to be anticorrelated with both, solar wind velocity and solar wind temperature. This apparent anti-correlation could be caused by several effects. Firstly, the ux of pickup He+ , being regarded as a source of super-thermal He+ , could decrease with increasing solar wind ve-locity. Or, secondly, the injection and acceleration efficiency of both, He+ and He++ depend on the solar wind velocity and/or solar wind thermal velocity. We performed 1D hybrid simulations of quasi-parallel shocks where solar wind He++ and pickup He+ ions are included self-consistently. The dependence of the injection and acceleration efficiency on solar wind velocity is investigated.

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