Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 119, Issue 3, Pages 1643-1657Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013JA019384
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Funding
- NASA [NAS5-0299, nnx13AF81G]
- NSF [1044495]
- German Ministry for Economy and Technology
- German Center for Aviation and Space (DLR) [50 OC 0302]
- NASA [NNX13AF81G, 475103] Funding Source: Federal RePORTER
- Directorate For Geosciences [1044495] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences [1044495] Funding Source: National Science Foundation
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It is well established that fast flows in the magnetotail plasma sheet which are separated from the ambient plasma by dipolarization fronts brake in the tail-dipole transition region. Flow/front braking is suggested to play an important role in generation of compressional waves in the inner magnetosphere and geomagnetic pulsations. Because of the paucity of multipoint observations in the tail-dipole transition region, however, details of wave generation during flow/front braking are unknown. Using comprehensive coverage of the near-Earth plasma sheet and geostationary orbit by six spacecraft, we explore the relationship between dipolarization fronts that propagated earthward at x = -11 to -9 R-E and stopped at x = -9 to -8 R-E and compressional oscillations observed at x approximate to -8 R-E. The oscillations, which were diamagnetic (i.e., exhibited antiphase variations in magnetic and plasma pressures), were observed about a minute prior to front detection. The amplitude of the magnetic oscillations at -8 R-E was similar to 5 nT; the wavelength was similar to 0.5 R-E. Enhancements of magnetic oscillations with different frequencies and amplitudes of 1 to 2 and 2 to 4 nT were detected at geosynchronous orbit and on the ground, respectively. Analysis of observations reveals that although the fast flow/front stopped a few R-E beyond geosynchronous orbit, the plasma compression propagated farther inward and excited compressional diamagnetic oscillations in the tail-dipole transition region.
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