Accession Number : ADA139122

Title :   Electron Energy Deposition in the Middle Atmosphere.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB

Personal Author(s) : Vampola,A L ; Gorney,D J

PDF Url : ADA139122

Report Date : 05 Dec 1983

Pagination or Media Count : 36

Abstract : Spectra of locally precipitating 36 to 317 keV electrons obtained by instrumentation on the S3-2 satellite are used to calculate energy deposition profiles as a function of latitude, longitude, and altitude. In the 70 - 90 km altitude, midlatitude ionization due to these precipitating energetic electrons can be comparable to that due to direct solar H Lyman alpha. At night, the electrons produce ionization more than an order of magnitude greater than that expected from scattered H Lyman alpha. Maximum precipitation rates in the region of the South Atlantic Anomaly are on the order of 1/100 erg/sw cm-sec with a spectrum of the form j(E) = 134000 x 1/E + 2.27 power (keV). Southern hemisphere precipitation dominates that in the north for 1.1 L 6 except for regions of low local surface field in the northern hemisphere. Above L = 6, local time effects dominates; i.e., longitudinal effects due to the asymmetric magnetic field which are strong features below L = 6 disappear and are replaced by high-latitude precipitation events which are local-time features. (Author)

Descriptors :   *Ionosphere, *D region, Magnetosphere, Electron energy, Ionization, Electromagnetic wave propagation, Energy transfer, Altitude, Southern hemisphere, South atlantic Ocean

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE