Ionospheric electrodynamic model with an eccentric dipole geomagnetic field

Details Ionospheric electrodynamic model with an eccentric dipole geomagnetic field Ionospheric electrodynamic model with an eccentric dipole geomagnetic field

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..795s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 7, p. 795-803

Physics

Computerized Simulation, Dynamo Theory, Earth Ionosphere, Eccentricity, Electrodynamics, Geomagnetism, Magnetic Dipoles, Atmospheric Circulation, Lines Of Force, Magnetic Field Configurations, Plasma Density, Variations

Scientific paper

A computer model of ionospheric electrodynamic processes using an eccentric dipole (ED) for the geomagnetic field has been developed. This is a development from existing models which are based on the centred dipole (CD) coaxial with the geographic axis. The ED dynamo model introduces or modifies the effects of hemispheral asymmetry and longitudinal variation in the dynamo processes through two explicit parameters - the geomagnetic field intensity and the length of the field lines. These parameters of the ED field have been quantified and displayed. An additional contribution to the above effects comes implicity from the ionospheric parameters - plasma density and atmospheric tidal winds - which become asymmetric relative to the ED dip equator. The integrated effect of the geomagnetic and ionospheric parameters produces significant variation in the field line integrated ionospheric conductivity. The ED dynamo model shows that the peak height of the equatorial electrojet (EEJ) moves by over 2 km and height profiles of the EEJ display strong hemispherical asymmetry.

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