Magnetic activity inside the auroral zones and field-aligned currents |
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| Authors: | Jean-Louis Le Mouël Pierre-Noël Mayaud Peter Shebalin |
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| Institution: | 1. Institut de physique du Globe de Paris, 4, place Jussieu, 75252 Paris cedex 05, France;2. 42, rue de Grenelle, 75343 Paris cedex 07, France;3. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Warshavskoye shosse, 79, korp 2, Moscow 113556, Russia |
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| Abstract: | Big perturbations of the magnetic field (amplitudes larger than 250 nT) are simply detected by subtracting the values of a model from the measurements of CHAMP satellite. Taking a full year of CHAMP data and organizing them in four subsets of three months length (spring, summer, autumn, winter), it is found that: (a) the two domains where such big perturbations mainly exist are limited, in both hemispheres, by a parallel of high latitude of the corrected geomagnetic coordinates system; (b) a conspicuous seasonal (annual) variation affects the density of the perturbations and is opposite in the two hemispheres. We hold that these perturbations are linked to the midday magnetic activity within the auroral zone, long ago described by one of us (Mayaud, 1956). The source of the perturbations observed at the satellite altitude would be field-aligned currents resulting from the penetration of the solar wind into the magnetospheric cusps. To cite this article: J.-L. Le Mouël et al., C. R. Geoscience 335 (2003). |
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| Keywords: | magnetic activity auroral zones field-aligned currents CHAMP satellite activité magnétique zones aurorales courants alignés satellite CHAMP |
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