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          Institute: MPI für extraterrestrische Physik     Collection: Space Plasma Physics     Display Documents

ID: 12953.0, MPI für extraterrestrische Physik / Space Plasma Physics
Statistical survey of magnetic field and ion velocity fluctuations in the near-Earth plasma sheet: Active Magnetospheric Particle Trace Explorers Ion Release Module (AMPTE IRM) measurements
Authors:Neagu, Elena; Borovsky, Joseph E.; Thomsen, Michelle F.; Gary, S. Peter; Baumjohann, Wolfgang; Treumann, Rudolf A.
Date of Publication (YYYY-MM-DD):2002-07
Title of Journal:Journal of Geophysical Research A
Journal Abbrev.:J. Geophys. Res. A
Issue / Number:A7
End Page:1098
Sequence Number of Article:1098
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:[1] Low-frequency magnetic field and ion velocity fluctuations in the plasma sheet of Earth's magnetotail are surveyed using data from Active Magnetospheric Particle Trace Explorers/Ion Release Module (AMPTE/IRM) tail passes in 1985 and 1986. The data is divided into 259 ten-minute-long intervals, and the velocity and field fluctuation amplitudes and plasma parameters are determined for each interval. There is no significant dependence of the amplitude of the fluctuations on either the down-tail distance or the distance from the neutral sheet. The amplitudes of both the field and velocity fluctuations are positively correlated with the level of geomagnetic activity as measured by the AE index. The strongest correlation is between the fluctuating velocities and the average ion velocities. These results suggest that geomagnetic activity is the global source of enhanced field and velocity fluctuations observed in the plasma sheet and that velocity shear instabilitiesmay be the proximate cause of these fluctuations.
Free Keywords:magnetotail; plasma sheet; fluctuations; geomagnetic activity
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Los Alamos Natl Lab, Space & Atmospher Sci Grp, Mail Stop; D466,Grp NIS-1 SM-30,Bikini Atoll Rd, Los Alamos, NM 87545 USA; Los Alamos Natl Lab, Space & Atmospher Sci Grp, Los Alamos, NM 87545 USA; Max Planck Inst Extraterr Phys, D-85748 Garching, Germany; OAW, Inst Weltraumforsch, Graz, Austria
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