Accession Number : AD0715266

Title :   Outer-Zone Electron Precipitation,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Vampola,Alfred L. ; Koons,Harry C. ; McPherson,Donald A.

Report Date : 15 AUG 1970

Pagination or Media Count : 32

Abstract : Measurements of energetic electrons (300 keV to 2.3 MeV) within the drift loss cone, of ELF emissions, and of the plasmapause location obtained with instruments aboard the low-altitude, polar satellite OV3-3 (1966-70A) are compared. It is found that there is a knee in the L-shell profile of the precipitated fluxes of outer-zone electrons with the flux decreasing toward lower latitudes. The location of this knee strongly correlates with the morning location of the plasma-pause but does not correlate with the evening location of the plasmapause. It is also found that, for 3.3 = or < L = or < 4.3, electrons are preferentially precipitated in the morning hours after 6:00 local time. This corresponds to the strong morning maximum in the occurrence of whistler-mode ELF emissions. Electromagnetic ELF emissions are often observed just outside of the plasmapause where the maximum flux of precipitated electrons is observed. The experimental data suggest that the morning location of the plasmapause is the controlling factor in the low latitude decrease of outer-zone electron precipitation. (Author)

Descriptors :   (*MAGNETOSPHERE, ELECTRON DENSITY), WHISTLERS, DAWN CHORUS, SOLAR WIND, GEOMAGNETISM, SOUNDING ROCKETS, SCIENTIFIC SATELLITES, DIURNAL VARIATIONS, POLAR ORBIT TRAJECTORIES, UPPER ATMOSPHERE, ATMOSPHERIC ELECTRICITY, PLASMA MEDIUM, EXTREMELY LOW FREQUENCY, VERY LOW FREQUENCY, LOW ALTITUDE

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE