Accession Number : ADA137982

Title :   Observations of VLF Transmitter-Induced Depletions of Inner Zone Electrons.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB

Personal Author(s) : Vampola,A L

PDF Url : ADA137982

Report Date : 09 Dec 1983

Pagination or Media Count : 26

Abstract : Precipitation spikes of electrons, in which the energy spread of the peak is narrow (less than 50 keV) and the peak energy is a strong function of the location in L, have been observed in the region 1.5 L 2.0 and have been ascribed to interactions between waves from high power VLF transmitters on the ground and the precipitated electrons. Instrumentation on the S3-2 satellite (polar orbit, 240 km and 1557 km perigee and apogee) included a large geometric factor electron spectrometer which, due to the characteristics of the instrument and orbit, routinely observed these precipitation spikes. Additionally, on numerous occasions when these spikes were observed at low altitude, a significant depletion of electrons at the same energies was observed high on the field line. These depletions indicate that the loss rate of electrons due to VLF transmitters is significant and usually exceeds the rate at which radial diffusion is refilling those field lines. Electrons with energies between 36 and 317 keV in the region 1.9 L 1.6 were observed to have lifetimes limited to a few days by interactions with waves from VLF transmitters. Thus the outer edge of the inner zone is defined by this wave-particle process. (Author)

Descriptors :   *Magnetic storms, *Electrons, *Precipitation, *Spikes, *Data bases, Interactions, Particles, Waves, High power, Very low frequency, Transmitters, Low altitude

Subject Categories : Information Science
      Geomagnetism
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE