Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510703l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10703-10706.
Physics
21
Bow Waves, Earth Atmosphere, Extremely Low Radio Frequencies, Magnetic Signatures, Magnetohydrodynamic Stability, Wave Propagation, Coherence, Consecutive Events, Correlation Coefficients, Gyrofrequency, International Sun Earth Explorers, Solar Wind
Scientific paper
High-time-resolution magnetic-field data for different separations of ISEE 1 and 2 in the earth's ion foreshock region are examined to study the coherence length of upstream ULF waves. Examining the correlation coefficients of the low-frequency waves as a function of separation distance shows that the correlation coefficient depends mainly on the separation distance of ISEE 1 and 2 transverse to the solar-wind flow. It drops to about 0.5 when the transverse separation is about 1 earth radius, a distance much larger than the proton thermal gyroradius in the solar wind. Thus the coherence length of the low-frequency waves is about one earth radius, which is of the order of the wavelength, and is consistent with that estimated from the bandwidth of the waves.
Le Guan
Russell Christopher T.
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