Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615711c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,711-15,723.
Physics
18
Extremely Low Frequencies, Geomagnetic Tail, Geomagnetism, Magnetic Field Configurations, Magnetic Storms, International Sun Earth Explorer 2, Magnetohydrodynamic Waves, Power Spectra, Satellite Observation
Scientific paper
ULF waves in the earth's magnetotail lobe region are examined using 1978 tail data from the ISEE 2-flux-gate magnetometer. The relation between the substorm activity, characterized by the AE index, and the wave power is also described. The wave amplitudes at periods of about 3 to 16 min are found to be below 0.8 nT for the transverse magnetic field components and below 0.6 nT for the compressional components about 90 percent of the time. The amplitudes of lower frequency waves are somewhat larger. For waves with periods of 16 to 64 min, the amplitudes are below 1 nT for both the compressional and transverse components about 90 percent of the time. The wave amplitudes and the AE index, which characterizes substorm activity, are weakly correlated, the correlation coefficients being about 0.55 and 0.35 for the compressional and transverse components, respectively.
Chen Sheng-Hsien
Galland Kivelson Margaret
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