Accession Number : ADA193008

Title :   On the Conjugacy of the Aurora: High and Low Latitudes.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB

Personal Author(s) : Mizera, P F ; Gorney, D J ; Evans, D S

PDF Url : ADA193008

Report Date : 05 Feb 1988

Pagination or Media Count : 18

Abstract : On December 5, 1983 the polar orbiting satellites NOAA-7 and DMSP-F6, while in opposite hemispheres, each crossed a narrow structure of auroral electron precipitation at nearly the same Universal Time (UT) and at the same high magnetic-latitude, local time location. The Operational Line Scanner (OLS) image taken by DMSP-F6 of the northern polar region showed that this enhancement was associated with a sun-aligned arc (SAA) which extended poleward from the midnight sector auroral zone and passed across the polar cap very near to the magnetic pole. The DMSP-F6 plasma measurements showed particle precipitation at background levels in the regions adjacent to the SAA suggesting that those magnetic field lines connected to the interplanetary medium via the northern tail lobe. NOAA-7 observations show that the analogous precipitation structure in the southern hemisphere was embedded in a region of low intensity ion and electron precipitation which had the characteristics of the plasma sheet population. Comparisons between the boundaries of the lower latitude auroral zone precipitation and the electron distributions at those boundaries were also made. The results of these comparisons together with those made for the high altitude SAA argue for a high degree of inter-hemisphere conjugacy in the electron precipitation over a wide range of invariant magnetic latitudes. Keywords: Plasma measurements, Auroral conjugacy, Electron precipitation, Polar orbiting satellites.

Descriptors :   *AURORAE, *PLASMAS(PHYSICS), DISTRIBUTION, ELECTRONS, HIGH ALTITUDE, INTERPLANETARY SPACE, INVARIANCE, IONS, LATITUDE, LINE SCANNING, LOW ALTITUDE, LOW INTENSITY, MAGNETIC FIELDS, PARTICLES, POLAR CAP, POLAR ORBIT TRAJECTORIES, POLAR REGIONS, PRECIPITATION, RANGE(EXTREMES), SHEETS, SOUTHERN HEMISPHERE, TIME, SCIENTIFIC SATELLITES

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE