Large scale response of the magnetosphere to a southward turning of the interplanetary magnetic field

Details Large scale response of the magnetosphere to a southward turning of the interplanetary magnetic field Large scale response of the magnetosphere to a southward turning of the interplanetary magnetic field

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.2365s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 1, 1987, p. 2365-2376. Research supported by the Max-Planck-Ges

Physics

22

Auroral Zones, Earth Magnetosphere, Geomagnetic Tail, Interplanetary Magnetic Fields, Solar Wind, Auroral Electrojets, Electron Precipitation, Energetic Particles, Geos Satellites (Esa), International Sun Earth Explorers, Plasma Layers

Scientific paper

A set of coordinated measurements obtained on March 4, 1979 in the solar wind, in the magnetotail, at geostationary orbit, in the auroral ionosphere, and on the ground has been used to conduct a detailed study of the overall magnetospheric response to a southward turning of the IMF. The change of the IMF direction is found to be associated with a delay of less than about 5 min for increasing eastward and westward electrojets, and precedes by about 10 min the beginning of a taillike deformation of the B field geometry at geostationary orbit near midnight. After the IMF reversal and before the main substorm onset, the general motion of the westward electrojet is southward. At 6.6 R(E) in the nightside, the equatorially trapped high-energy particles adiabatically respond to the local change of the B field by moving earthward. Short-lived substorms occur soon after the IMF reversal.

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