Physics – Plasma Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1429v&link_type=abstract
Journal of Geophysical Research, Volume 108, Issue A12, pp. SMP 12-1, CiteID 1429, DOI 10.1029/2003JA010155
Physics
Plasma Physics
9
Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Plasma Sheet, Space Plasma Physics: Turbulence
Scientific paper
A statistical study of the Cluster FGM data is performed on compressional waves for 68 selected 12 min intervals when the spacecraft are in or near the neutral sheet. The data are well distributed in local time between 2100 and 0300 LT. The compressional wave power is strongly dependent on the maximum plasma flow velocity (based on the CIS-CODIF data) during the 12-min interval. Up to a perpendicular flow velocity of ~400 km/s the spectral power increases with velocity; at higher velocities the spectral power saturates. The turbulence measured in the frequency range between 0.08 and 1 Hz shows that on that scale the magnetotail has fully developed quasi two-dimensional turbulence. We relate the quasi two-dimensional (2-D) turbulence to the finite extension of the flow channel, with a streaming instability as its source. There is an asymmetry in wave power between the premidnight and midnight/postmidnight sectors. The plasma flow direction splits the data into two distinct categories, the Earth/duskward and the tail/dawnward flows.
Asano Yasuhiro
Balogh André
Baumjohann Wolfgang
Klecker Berndt
Nakamura Riou
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