A flux rope followed by recurring encounters with traveling compression regions: GEOTAIL observations

Details A flux rope followed by recurring encounters with traveling compression regions: GEOTAIL observations A flux rope followed by recurring encounters with traveling compression regions: GEOTAIL observations

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2891k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2891-2894

Physics

13

Electric Fields, Geomagnetic Tail, Magnetic Flux, Planetary Magnetic Fields, Plasma Compression, Plasma Waves, Satellite Observation, Space Plasmas, Traveling Waves, Energetic Particles, Field Aligned Currents, Geophysical Satellites, Magnetic Disturbances, Mathematical Models, Perturbation, Plasma Density, Plasma Temperature

Scientific paper

This paper reports a peculiar series of events observed with Geotail on October 24, 1992 at X approximately equals -80 R(sub E). On this day a combination of a bipolar perturbation in B(sub y) and a double-peaked perturbation in B(sub z), signature of a flux rope, was observed. Following this flux rope, bipolar B(sub z) events, identifiable as Traveling Compression Regions (TCRs), were recurrently observed. The axis of the flux rope was deduced to be field-aligned. Energetic ions (electrons) streamed earthward (tailward) in the flux rope. During the TCRs, the E x B flow showed a bipolar north-then-south perturbation, consistent with expected lobe plasma motion. The TCRs corresponded to weak ground magnetic disturbances and Pi2 waves. The observations can be explained by a model in which quasi-stagnant plasmoids are recurrently generated.

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