Accession Number : ADA191164
Title : Coordinated Ground and Space Measurements of Auroral Surge over South Pole.
Descriptive Note : Technical rept.,
Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB
Personal Author(s) : Rosenberg, T J ; Detrick, D L ; Mizera, P F ; Gorney, D J ; Berkey, F T
PDF Url : ADA191164
Report Date : 01 Feb 1988
Pagination or Media Count : 42
Abstract : Coincident ground-based and satellite observations are presented of a premidnight auroral surge over Amundsen-Scott South Pole station. The set of near-simultaneous measurements provides an excellent opportunity to gain amore quantitative understanding of the nature of premidnight substorm activity at high geomagnetic latitudes. The surge produced a rapid onset of cosmic radio noise absorption at the station. On the polar-orbiting DMSP-F6 spacecraft, intense X-ray emissions with E 2 keV energy were imaged 1 to 2 deg magnetically equatorward of the South Pole approximately 1 min prior to the peak of the absorption event. The precipitating electron spectrum determined from the X-ray measurements could be characterized by an e-folding energy of approx. 11 keV and is found to be adequate to account for the cosmic noise absorption and maximum auroral luminosity recorded at South Pole. Photometer, all-sky camera, riometer, and magnetometer data are used to estimate the velocity of motion and spatial extent of the auroral precipitation and the ionospheric currents associated with the surge.
Descriptors : *AURORAE, ABSORPTION, ANTARCTIC REGIONS, ARTIFICIAL SATELLITES, ELECTRIC CURRENT, ELECTRON IMPACT SPECTRA, EMISSION, GEOMAGNETISM, HIGH LATITUDES, INTENSITY, IONOSPHERE, LUMINOSITY, MAGNETOMETERS, MEASUREMENT, MOTION, PEAK VALUES, PHOTOMETERS, PRECIPITATION, RIOMETERS, STORMS, SURGES, VELOCITY, X RAYS, MAGNETIC STORMS
Subject Categories : Atmospheric Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE