Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm53a1079l&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM53A-1079
Other
2744 Magnetotail, 2756 Planetary Magnetospheres (5443, 5737, 6033), 5443 Magnetospheres (2756), 5737 Magnetospheres (2756)
Scientific paper
Spectral indices from power spectra of the magnetic field fluctuations observed within the Earth's plasma sheet appear to confirm the presence of turbulence in the magnetotail. Using Galileo magnetometer data mainly from Jupiter's magnetotail, we have determined spectral indices from power spectra within the frequency range of tenths of mHz to 10 mHz for approximately 100 plasma sheet intervals over a range of local times principally in the noon to midnight sector and at radial distances between 20 and 60 RJ. We find spectral indices centered near -2.3 for the radial and azimuthal components of the field, but typically closer to -2.0 for the north-south component. The most probable values do not appear to depend strongly on local time but local time coverage is spotty. When examined as a function of the radial distance, the spectral index decreases with radial distance from values near -1.4 to 2.0 in the range 20-30 RJ to values near -2.3 to -2.6 in the range 50-60 RJ.. The observed spectral indices are not those expected for homogenous fully developed turbulence (-5/3) or MHD turbulence (- 3/2). For some of our observations, the large negative indices may relate to fluctuations in the dissipative regime. We will discuss our observations in the context of the spectral indices and other derived values.
Galland Kivelson Margaret
Joy Steven
Luk Onnie
Weygand James M.
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