Accession Number : ADA254665

Title :   Comprehensive Mappings of Electron Precipitation and its Effects on the Comprehensive Mappings of Electron Precipitation and its Effects on the Atmosphere.

Descriptive Note : Final rept. Jul 88-Jun 92,

Corporate Author : LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB

Personal Author(s) : Voss, H. D. ; Mobilia, J. ; Vondrak, R. R. ; Gaines, E. E. ; Datlowe, D. W.

Report Date : JUN 1992

Pagination or Media Count : 54

Abstract : Precipitation of energetic electrons is an important energy input to the earth's upper atmosphere and can alter the chemistry and dynamics of that region. The precipitation can be studied on a global basis using a satellite X-ray imager to make maps of the X-rays produced when the electrons stop in the atmosphere. We have used 4-40 keV X-ray data from the S81-1 SEEP satellite instrument to classify the patterns of precipitation at high latitudes; the three principal types are strong auroral arcs an the night side, extended dawnside arcs, and isolated pitches inside the polar cap. We also studied the characteristics of high energy (relativistic) electron precipitation with data from instruments that directly detect the electrons. This very penetrating radiation is important because the electrons deposit their energy down to altitudes as low as - 55 km. Ibis study found that the precipitation was confined to narrow latitude bands, often at the outer boundary of the belt of trapped electrons, and that it occurs more often at midnight local time than at noontime.

Descriptors :   ARTIFICIAL SATELLITES, ATMOSPHERICS, BOUNDARIES, CHEMISTRY, DEPOSITS, DYNAMICS, ELECTRONS, GLOBAL, HIGH ENERGY, HIGH LATITUDES, LATITUDE, MAPS, NIGHT, PATTERNS, POLAR CAP, PRECIPITATION, RADIATION, RELATIVISTIC ELECTRONS, REPRODUCTION, UPPER ATMOSPHERE, X RAYS.

Subject Categories : Atmospheric Physics
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE