Accession Number : AD0749859

Title :   A Model of Auroral Substorm Absorption.

Descriptive Note : Environmental research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Elkins,Terence J.

Report Date : 18 JUL 1972

Pagination or Media Count : 23

Abstract : High-frequency radio propagation at high latitudes is strongly affected by auroral absorption, which is known to occur sporadically in events known as auroral substorms. A brief discussion of the morphology of substorms is presented, followed by an analysis of auroral absorption during 60 substorms. The statistical parameters necessary to specify a predictive model are derived empirically as a function of time after substorm onset. Also presented from other evidence are relationships to model the latitude dependence, substorm duration, frequency dependence, and the seasonal and solar cycle dependence. A brief discussion of structure size in auroral absorption events is included. (Author)

Descriptors :   (*IONOSPHERIC DISTURBANCES, ATMOSPHERE MODELS), POLAR REGIONS, AURORAE, RADIOFREQUENCY INTERFERENCE, PROBABILITY DENSITY FUNCTIONS, DISTRIBUTION FUNCTIONS, HIGH FREQUENCY, IONOSPHERIC PROPAGATION, MAGNETIC STORMS

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE