Accession Number : ADA140615

Title :   Distributions of Aurora and Ionospheric Currents Observed Simultaneously on a Global Scale.

Descriptive Note : Scientific rept. for period ending 1981,

Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Craven,J D ; Kamide,Y ; Frank,L A ; Akasofu,S I ; Sugiura,M

PDF Url : ADA140615

Report Date : Aug 1983

Pagination or Media Count : 36

Abstract : The instantaneous spatial distribution of auroral emissions is observed with auroral imaging photometers on board the spacecraft Dynamics Explorer 1 (DE 1) as ground-based meridian chains of magnetometers simultaneously detect the magnetic signatures of ionospheric and field-aligned currents flowing at northern polar latitudes. Ionospheric conductivities at nighttime auroral latitudes are estimated from the measured auroral luminosities and used with the measured polar magnetic variations to compute model distributions of ionospheric and field-aligned currents. Temporal resolution for the coordinated observations and model calculations is 12 minutes. Model ionospheric and field-aligned current distributions are overlayed on global auroral images to illustrate spatial relations on a global scale at the maximum epoch of an auroral substorm. Eccentric-dipole-latitude and magnetic-local-time coordinates are used. A model field-aligned current distribution is compared quantitatively with the distribution of field-aligned currents inferred from simultaneous observations by the DE-2 magnetometer. (Author)

Descriptors :   *Aurorae, *Ionospheric modification, Emission, Magnetic storms, Spatial distribution, Field theory, Solar satellites, Magnetometers, Polar regions, High latitudes

Subject Categories : Atmospheric Physics
      Geomagnetism
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE