Accession Number : ADA137947

Title :   Chatanika Radar and S3-2 Measurements of Auroral-Zone Electrodynamics in the Midnight Sector.

Descriptive Note : Rept. for 6 Jul 82-31 Oct 83,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA

Personal Author(s) : Robinson,R M

PDF Url : ADA137947

Report Date : Nov 1983

Pagination or Media Count : 41

Abstract : Chatanika radar measurements were combined with S3-2 satellite data obtained during passes over the midnight sector auroral zone to study the relationships between conductivities, electric fields, and currents in the Harang discontinuity. Three passes were chosen based on the quality of the radar and satellite data and the availability of supplementary ground-based or satellite measurements. The radar measured electric fields and conductivities as a function of latitude and local time. The satellite measured the latitudinal distribution of electric field and field-aligned current during the three polar passes. The most intenser electric fields were observed in the poleward and equatorward portions of the auroral oval as defined by the region of enhanced ionospheric conductivity. These high electric fields were located at the boundaries between oppositely directed field-aligned-current sheets. The dominant field-aligned-current region in the Harang discontinuity was a broad upward current sheet within which bright auroral arcs were observed. In the three cases examined, there was a net upward current in the discontinuity. (Author)

Descriptors :   *IONOSPHERIC PROPAGATION, *PLASMAS(PHYSICS), *IONOSPHERIC DISTURBANCES, *RADAR SIGNALS, ELECTRIC FIELDS, SCIENTIFIC SATELLITES, MAGNETIC FIELDS

Subject Categories : Atmospheric Physics
      Active & Passive Radar Detection & Equipment
      Plasma Physics and Magnetohydrodynamics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE