Short-period magnetic pulsations during substorms

Details Short-period magnetic pulsations during substorms Short-period magnetic pulsations during substorms

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..599k&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 599-602 (SEE N85-24544 14-46)

Physics

Auroras, Geomagnetic Pulsations, Magnetic Storms, Earth Ionosphere, Field Aligned Currents, Magnetic Measurement, Magnetospheric Instability

Scientific paper

Coordinated observations of auroral phenomena together with magnetic pulsation recordings at a dense network of stations were used to study substorm processes and generation of substorm-associated magnetic pulsations. It is shown that a PiB magnetic pulsation event is a good measure of the onset and intensification of the substorm. The generation of PiB pulsations is closely connected to localized field-aligned upward currents. Intervals of pulsation with diminishing period (IPDP) type wave events are a manifestation of the westward expansion of the substorm. The source region of IPDP pulsations may expand 100 deg in east-west direction in the course of the substorm. The source also moves inwards as the frequency of pulsations increases.

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