On the acceleration of energetic particles in the interplanetary medium
- Fisk, L. A.
- Jan 1, 1976.
- Physical Description:
- 1 electronic document
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- Fermi scattering and transit time damping are two possible mechanisms for accelerating low energy protons (approximately 1 Mev) in co-rotating particle streams. Solutions to the equations which govern particle behavior in such streams are presented. It was found that acceleration by Fermi scattering requires a scattering mean-free path more than an order of magnitude smaller than the nominal value for low energy particles of 0.1 AU. Transit time damping of only the observed low level of magnitude fluctuations in the interplanetary magnetic field appears to yield the required acceleration rate. Measurements of the direction of the anisotropy in the particle streams could help in deciding which mechanism is operative. In the case of Fermi scattering the anisotropy must be in the heliocentric radial direction, whereas for transit time damping a significant azimuthal anisotropy could be present.
- Other Subject(s):
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19760012956.
Accession ID: 76N20044.
- No Copyright.
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