Accession Number : AD0416404

Title :   SCATTERING OF ENERGETIC TRAPPED ELECTRONS BY VERY LOW FREQUENCY WAVES,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF

Personal Author(s) : Cornwall,John M.

Report Date : 19 AUG 1963

Pagination or Media Count : 21

Abstract : The role of VLF waves in precipitating fast electrons is studied. It is found that, by Doppler-shifting whistler frequencies (1-10 kc) up to the local Larmor frequency, a resonant interaction of the type proposed by Dragt and Wentzel (for interaction of protons with hydromagnetic waves) can cause the electrons' mirror points to move randomly. The conditions for resonance lead to a very characteristic dependence on L of the regions of the magnetosphere where VLF waves can effectively precipitate electrons. In general, one expects to see, in a plot of flux vs L, two peaks separated by a broad minimum, the first peak near L approximately equal 1.2. and the second near L approximately equal 2. Such peaks have been seen by several experimenters. In certain regions of space it may be that whistlers can dominate the lifetimes of trapped electrons, especially for L approximately greater then 2. (Author)

Descriptors :   (*ELECTRONS, RESONANCE SCATTERING), (*VERY LOW FREQUENCY, RADIO WAVES), (*WHISTLERS, ELECTRON TRANSITIONS), MAGNETOHYDRODYNAMICS, GEOMAGNETISM, DOPPLER EFFECT, COSMIC RAYS, REFRACTIVE INDEX, ENERGY CONVERSION, PERTURBATION THEORY, ELECTROMAGNETIC RADIATION, ENERGY

Distribution Statement : APPROVED FOR PUBLIC RELEASE