Particle acceleration and Alfvén wave generation by an interplanetary shock
| Autor: | S. N. Taneev, E. G. Berezhko |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Astronomy Astronomy and Astrophysics 01 natural sciences Spectral line Computational physics Particle acceleration Alfvén wave Shock waves in astrophysics Solar wind Deflection (physics) Space and Planetary Science Physics::Space Physics 0103 physical sciences Interplanetary magnetic field 010306 general physics Interplanetary spaceflight 010303 astronomy & astrophysics |
| Zdroj: | Astronomy Letters. 42:126-135 |
| ISSN: | 1562-6873 1063-7737 |
| DOI: | 10.1134/s1063773716010011 |
| Popis: | Based on the event observed by ISEE 3 near the Earth’s orbit at 01:21 UT on April 5, 1979, we investigate the diffusive shock acceleration of ions and the generation of Alfven waves by accelerated particles near the quasi-parallel parts of interplanetary shock fronts within a quasi-linear approach. The theory is shown to give an excessively high level of Alfven wave generation by accelerated particles at significant deflection angles of the interplanetary magnetic field from the normal to the shock front. At the Earth’s orbit, the Alfve´ n waves produced by accelerated ions are confined within the frequency range 5 × 10−2−0.5 Hz, and their spectral peak with a wave amplitude δB ≤ B corresponds to a frequency ν = (1−2)×10−2 Hz. The high-frequency part of the wave spectrum (ν ≥ 0.5 Hz) is subjected to damping on thermal protons. The calculated spectra of the accelerated ions and Alfven waves generated by them reproduce the main features observed in experiments. |
| Databáze: | OpenAIRE |
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