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11 - The Ionospheric Field

from Part III - Spatial and Temporal Variations of the Geomagnetic Field

Published online by Cambridge University Press:  25 October 2019

Edited by
Mioara Mandea ,
Monika Korte ,
Andrew Yau  and
Eduard Petrovsky
Mioara Mandea
Affiliation:
Centre National d'études Spatiales, France
Monika Korte
Affiliation:
GeoforschungsZentrum, Helmholtz-Zentrum, Potsdam
Andrew Yau
Affiliation:
University of Calgary
Eduard Petrovsky
Affiliation:
Academy of Sciences of the Czech Republic, Prague
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Summary

The ionosphere boundary between the magnetosphere and atmosphere is often considered thin in the magnetosphere-ionosphere-thermosphere system. This approximation is not valid at the inner boundary, where height variation is important in ionosphere-thermosphere (I-T) coupling, particularly with respect to momentum/energy transfer. Here the Cowling channel and energy coupling between regions are better modelled including altitude variations. In the equatorial region the equatorial plasma fountain results from a field perpendicular ExB drift and field aligned plasma diffusion, while the equatorial ionisation anomaly is formed by removal of equatorial plasma by upward ExB drift. Under magnetic storm conditions an eastward prompt penetration electric field and neutral winds contribute. The polar cap ionosphere and auroral zones transfer solar wind energy into the magnetosphere. In the polar cap key indicators for energy/momentum transfer to the solar wind I-T system are the cross-polar cap potential/electric field, and the relationship to the interplanetary magnetic field where linear and non-linear relationships may occur. Models have been produced to describe various aspects of the coupled system. In the auroral zones aurora are associated with different regions and processes; substorm-associated aurora, shock associated aurora, pulsation aurora, cusp aurora and mid-latitude aurora. These categories and recent models are referenced.

Keywords

ionosphere-thermospherePedersen and Hall conductivitiesmomentum transferCowling channelenergeticsEquatorial ionization anomalyplasma fountainsuper plasma fountaincross-polar potentialconvectionconductanceirregularitiesauroraionospheremagnetosphere
Type
Chapter
Information
Geomagnetism, Aeronomy and Space Weather
A Journey from the Earth's Core to the Sun
 , pp. 141 - 159
Publisher: Cambridge University Press
Print publication year: 2019

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