ON THE EFFECT OF GEOMAGNETIC FLUCTUATIONS ON TRAPPED PARTICLES
Journal Article
·
· J. Geophys. Research
The effect of large-scale geomagnetic fluctuations on Van-Allen-belt particles with mirror points near the geomagnetic equatorial plane is studied in a model in which a dipole field is perturbed by the sudden approach and adiabatic withdrawal of a perfectly conducting plane. The Cokker-Planck equation for the particle density is obtained by following the motions of the particle guiding centers, assuming that the first and second adiabatic invariants, but not the third, remain valid during the approach. Steadystate and transient solutions for several cases are obtained. The steady-state solution for the density of particles with a particular nonrelativistic energy E, due to a source producing the density KE-(sup s+1/) at an intermediate radius with sinks at very large and very small radii, varies between Forbush decreases and the 27-day variation, are with radius r approximately as r/sup -4=3s/ inside the source region and as r/ sup -11-3s/ outside it. (auth)
- Research Organization:
- California Inst. of Tech., Pasadena
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-021245
- OSTI ID:
- 4828255
- Journal Information:
- J. Geophys. Research, Journal Name: J. Geophys. Research Vol. Vol: 67
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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