Accession Number : ADA135210

Title :   A New Model of the Geomagnetic Variation in the Upper Atmosphere.

Descriptive Note : Final rept. 1 Apr 81-15 Aug 83,

Corporate Author : SMITHSONIAN ASTROPHYSICAL OBSERVATORY CAMBRIDGE MA

Personal Author(s) : Slowey,J W

PDF Url : ADA135210

Report Date : Sep 1983

Pagination or Media Count : 13

Abstract : A new empirical model of the geomagnetic variation in the earth's thermosphere and exosphere is presented. The form of the new model is similar to that developed earlier by Jacchia et al. from ESRO 4 mass spectrometer data. It differs from the earlier formulation in that it incorporates the variation with local magnetic time, allows the shape of the latitudinal response to vary with the level of geomagnetic disturbance and includes a latitude-dependent term in the thermal component of the variation. A new index of disturbance is also introduced that is designed to take into account the effect of the prior heat input associated with geomagnetic activity. The model parameters are essentially those deduced from analysis of the ESRO 4 mass spectrometer data. Some refinement of the parameters is to be expected, especially in regard to separation of thermal and mass transport effects in low latitudes. (Author)

Descriptors :   *MATHEMATICAL MODELS, *GEOMAGNETISM, *THERMOSPHERE, *EXOSPHERE, UPPER ATMOSPHERE, MAGNETIC FIELDS, VARIATIONS, TIME, SHAPE, LATITUDE, LOW LEVEL, MAGNETIC DISTURBANCES, THERMAL PROPERTIES, HEAT TRANSFER, INPUT, MASS SPECTROMETRY, MASS TRANSFER, NITROGEN, DENSITY, ISOTHERMS, TEMPERATURE

Subject Categories : Geomagnetism
      Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE