Accession Number : ADA183143

Title :   A Mid-Latitude Scintillation Model.

Descriptive Note : Technical rept. 1 Nov 85-31 Oct 86,

Corporate Author : NORTHWEST RESEARCH ASSOCIATES INC BELLEVUE WA

Personal Author(s) : Robins,Robert E ; Secan,James A ; Fremouw,E J

PDF Url : ADA183143

Report Date : 31 Oct 1986

Pagination or Media Count : 75

Abstract : Radiowave scintillation in the presence of ionospheric disturbances has the potential to disrupt numerous transionospheric radio and radar systems. This report describes development of a model characterizing the plasma density irregularities that produce scintillation in the naturally disturbed mid latitude F layer. The model will be incorporated into Program WBMOD, which includes subroutines for computing both link geometry and scintillation indices, the latter by means of phase screen diffraction theory. Earlier versions of WBMOD, were based on extensive analysis of scintillation data collected in the auroral and equatorial zones in Wideband Satellite Mission. The model described herein is based on similarly extensive analysis of Wideband data from one mid latitude station and of data collected from HiLat satellite at another mid latitude station. The model describes irregularities at an effective height of 350 km that are isotropic across the geomagnetic field and elongated by a factor of 10 along the field and whose one-dimensional spatial power spectrum obeys a single regime power law with a (negative) spectral index of 1.5. The height-integrated spectral strength of the irregularities is modeled as a function apex latitude of the point. The report highlights a disagreement by a factor of approximately three between irregularity strength inferred from the two satellites in a region of overlap between the two mid-latitude stations.

Descriptors :   *IONOSPHERIC DISTURBANCES, *RADIO INTERFERENCE, *RADAR INTERFERENCE, AURORAE, EQUATORIAL REGIONS, POLAR REGIONS, GEOMETRY, RADIO LINKS, MODELS, TEMPERATE REGIONS, ONE DIMENSIONAL, POWER SPECTRA, SPATIAL DISTRIBUTION, GEOMAGNETISM, MAGNETIC FIELDS, LATITUDE, DENSITY, PLASMAS(PHYSICS), F REGION, IONOSPHERIC SCINTILLATIONS, SUNSPOTS, MILITARY SATELLITES, RADAR EQUIPMENT, OVERLAP, SCINTILLATION, POWER, STATIONS, TEMPERATE REGIONS, BROADBAND, RADIO WAVES, INDEXES, SUBROUTINES, ARTIFICIAL SATELLITES

Subject Categories : Atmospheric Physics
      Electromagnetic Pulses

Distribution Statement : APPROVED FOR PUBLIC RELEASE