He(2+) heating at a quasi-parallel shock

Details He(2+) heating at a quasi-parallel shock He(2+) heating at a quasi-parallel shock

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9805f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9805-9810. DOE-sponsored research.

Physics

7

Helium Ions, Helium Plasma, Oblique Shock Waves, Plasma Heating, Solar Terrestrial Interactions, Bow Waves, Collisionless Plasmas, Normal Density Functions, Normal Shock Waves, Particle Energy, Protons

Scientific paper

The first observations of solar wind He(2+) heating downstream from the earth's quasi-parallel shock is presented. These observations show that in conjunction with protons, two different regions are observed. In regions where the proton distribution is cooler, more dense, and similar to that observed downstream from quasi-perpendicular shocks, the He(2+) distribution is shell-like, also similar to that observed downstream from quasi-perpendicular shocks. In regions where the proton distribution is hotter, less dense, and Maxwellian-like, the He(2+) distribution is also Maxwellian-like without evidence for a shell. These observations support the interpretation that the nearly isotropic proton and He(2+) distributions are produced through the strong interaction of a very dense specularly reflected proton beam with the incident solar wind, while the cooler proton distributions and shell-like He(2+) distributions are produced in a manner similar to that at the quasi-perpendicular bow shock.

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