Magnetospheric processes preceding the onset of an isolated substorm - A case study of the March 31, 1978, substorm

Details Magnetospheric processes preceding the onset of an isolated substorm - A case study of the March 31, 1978, substorm Magnetospheric processes preceding the onset of an isolated substorm - A case study of the March 31, 1978, substorm

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7005n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 7005-7014.

Physics

21

Geomagnetism, Interplanetary Magnetic Fields, Magnetic Disturbances, Magnetospheric Instability, Polar Substorms, Auroral Zones, Geomagnetic Micropulsations, Ionospheric Currents, Magnetic Signatures, Satellite Observation, Solar Wind

Scientific paper

A detailed examination is conducted of the effect of a southward turning of the IMF on the state of the magnetosphere, using magnetometer meridian chain and spacecraft data for the clear onset substorm of March 31, 1978. At this time, the magnetometer stations were located in the midnight-to-morning sector, while the spacecraft were near the equatorial plane of the nightside magnetosphere. There was a one-hour interval between the IMF southward turning and the onset of the substorm expansion phase, and during this interval a DP 2-type ionospheric current system developed. This association of the expansion phase onset with the decrease of the magnetic field energy density in the tail provides evidence that the substorm energy was supplied by the unloading of energy from the tail.

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