Scatter-free propagation of low-energy protons in the magnetosheath - Implications for the production of field-aligned ion beams by nonthermal leakage

Details Scatter-free propagation of low-energy protons in the magnetosheath - Implications for the production of field-aligned ion beams by nonthermal leakage Scatter-free propagation of low-energy protons in the magnetosheath - Implications for the production of field-aligned ion beams by nonthermal leakage

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1439b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1439-1449.

Astronomy and Astrophysics

Astronomy

8

Astronomical Models, Interplanetary Magnetic Fields, Ion Beams, Magnetosheath, Magnetospheric Ion Density, Proton Energy, Proton Scattering, Bow Waves, Ion Scattering, Shock Waves

Scientific paper

The scatter-free propagation of low-energy (1-5 keV) protons in the magnetosheath is investigated by following test particle trajectories in a model of the magnetosheath fields previously obtained from gasdynamic simulations. The work concentrates on those ions energized by near-specular reflection at the quasi-perpendicular shock: the reflected-gyrating ions. The results indicate that for the most common orientations of the interplanetary field, it is unlikely that such ions when scattered in pitch angle behind the near-perpendicular bow shock can contribute to upstream field-aligned beams leaving the bow shock at shock-normal angles greater than 45 deg. Reflected-gyrating ions similarly scattered behind the quasi-perpendicular shock are more likely to contribute to such beams by leaking from the bow shock close to where they entered the magnetosheath.

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