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

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)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1983
Accession Number
ADA135210

Entities

People

  • J. W. Slowey

Organizations

  • Smithsonian Astrophysical Observatory

Tags

DTIC Thesaurus Topics

  • Artificial Satellites
  • Atmospheres
  • Atmospheric Temperature
  • Corpuscular Radiation
  • Equations
  • Grids
  • High Latitudes
  • Isotherms
  • Latitude
  • Magnetic Disturbances
  • Magnetic Storms
  • Mass Spectrometers
  • Measurement
  • Orbits
  • Security
  • Spectrometers
  • Thermosphere

Fields of Study

  • Environmental science

Readers

  • Computational Modeling and Simulation
  • Space Exploration and Orbital Mechanics.