Evidence for acceleration of ions to ~1 MeV by adiabatic-like reflection at the quasi-perpendicular Earth's bow shock

Details Evidence for acceleration of ions to ~1 MeV by adiabatic-like reflection at the quasi-perpendicular Earth's bow shock Evidence for acceleration of ions to ~1 MeV by adiabatic-like reflection at the quasi-perpendicular Earth's bow shock

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2925m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 19, p. 2925-2928

Physics

8

Interplanetary Physics: Energetic Particles, Solar, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Solar Wind Plasma

Scientific paper

On December 6, 1994, during a CIR (Corotating Interaction Region) event, the WIND 3D-Plasma and energetic particle experiment observed a burst (<=24 s) of 238-676 keV protons close to the electron foreshock boundary, followed by a 156-236 keV, 101-156 keV and 33-101 keV proton bursts about ~40 s, 65 s and 85 s later, respectively. Similar dispersed bursts of helium with energies between ~50 keV and ~1 MeV followed the proton bursts. During this time, the IMF direction varied slowly with an almost monotonic decrease in θBn. The proton energy spectrum is initially peaked at ~350 keV, and progresses to lower energies with time. The proton 3D angular distributions are peaked at ~30° pitch-angle, propagating away from the shock, but they are nongyrotropic. Finally, we show that the proton energy-spectra as well as the pitch angle distribution agree quantitatively with a model of a single adiabatic reflection of the incident energetic interplanetary ions by the quasi-perpendicular shock.

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