Accession Number : ADA131215

Title :   The Anisotropy of High Latitude Nighttime F-Region Irregularities.

Descriptive Note : Technical rept.,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA

Personal Author(s) : Livingston,Robert C ; Owen,Jacqueline ; Rino,Charles L ; Tsunoda,Roland T

PDF Url : ADA131215

Report Date : 31 Mar 1982

Pagination or Media Count : 34

Abstract : The anisotropy of intermediate-scale, F-region irregularities in the nighttime auroral zone is described. The study is based upon spaced-receiver phase-scintillation measurements made with the Wideband satellite at Poker Flat, Alaska. A systematic dependence of irregularity anisotropy with local time and magnetic latitude is observed, suggesting convective control. Sheet-like irregularities are confined to the zone of east-west drift near the equatorward boundary of the auroral zone. At the flow reversal, or Harang discontinuity, the cross-field extension of the sheets is reduced. The extension of rod-like irregularities, which are observed poleward of the zonal convection boundary, also shows apparent convection dominance. Mechanisms for convection control of the anisotropy are discussed. (Author)

Descriptors :   *Ionospheric propagation, *Electron density, *F region, *Aurorae, Anisotropy, High latitudes, Night, Scintillation, Radio waves, Artificial satellites, Broadband, Measurement, Time, Convection(Atmospheric), Control, Discontinuities, Sheets, Boundaries, Magnetic fields, Coherence, Ionospheric disturbances

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE