Field and thermal plasma observations of ULF pulsations during a magnetically disturbed interval

Details Field and thermal plasma observations of ULF pulsations during a magnetically disturbed interval Field and thermal plasma observations of ULF pulsations during a magnetically disturbed interval

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714859l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,859-14,875.

Physics

12

Extremely Low Radio Frequencies, Geomagnetic Pulsations, Magnetic Disturbances, Solar Terrestrial Interactions, Thermal Plasmas, Dynamics Explorer 1 Satellite, Earth Magnetosphere, Space Plasmas

Scientific paper

A ULF pulsation event is discussed on the basis of experimental observations of electric and magnetic field measurements as well as particle measurements from the DE 1 spacecraft. The observations were made near the magnetic equator in a space covering a large range of L shells and magnetic latitudes, and comparisons are made to ground observations. Azimuthal oscillations are observed following gradually decaying long-period compressional waves. Weak interaction between magnetic shells indicates that the source is probably weak, and ground data on magnetic pulsations showed strong signals that did not necessarily correspond to the quasisinusoidal pulsations observed in space. Azimuthal pulsations observed by the spacecraft indicate that there was a plasma density gradient beyond the plasmapause. The ULF pulsations were probably affected by changes in the magnetic field and solar-wind dynamic pressure, and their periods are found to be linked to geomagnetic latitude.

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