Accelerated ions and self-excited Alfvén waves at the Earth's bow shock

Details Accelerated ions and self-excited Alfvén waves at the Earth's bow shock Accelerated ions and self-excited Alfvén waves at the Earth's bow shock

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11607102b&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A7, CiteID A07102

Statistics

Computation

Computational Geophysics: Modeling (1952, 4255, 4316), Space Plasma Physics: Particle Acceleration, Space Plasma Physics: Shock Waves (4455), Space Plasma Physics: Turbulence (4490), Space Plasma Physics: Wave/Particle Interactions (2483, 6984)

Scientific paper

The diffuse energetic ion event and related Alfvén waves upstream of the Earth's bow shock, measured by AMPTE/IRM satellite on 29 September 1984, 06:42-07:22 UT, was studied using a self-consistent quasi-linear theory of ion diffusive shock acceleration and associated Alfvén wave generation. The wave energy density satisfies a wave kinetic equation, and the ion distribution function satisfies the diffusive transport equation. These coupled equations are solved numerically, and calculated ion and wave spectra are compared with observations. It is shown that calculated steady state ion and Alfvén wave spectra are established during the time period of about 1000 s. Alfvén waves excited by accelerated ions are confined within the frequency range (10-2 to 1) Hz, and their spectral peak with the wave amplitude δB ≈ B comparable to the interplanetary magnetic field value B corresponds to the frequency 2 × 10-2 Hz. The high-frequency part of the wave spectrum undergoes absorption by thermal protons. It is shown that the observed ion spectra and the associated Alfvén wave spectra are consistent with the theoretical prediction.

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