Physics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91...59m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Jan. 1, 1986, p. 59-69. Previously announced in STAR as N85-27784.
Physics
56
Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Magnetohydrodynamic Turbulence, Solar Wind, Correlation, International Sun Earth Explorers, Interplanetary Medium, Variability
Scientific paper
A method for calculation ensemble averages from magnetic field data is described. A data set comprising approximately 16 months of nearly continuous ISEE-3 magnetic field data is used in this study. Individual subintervals of this data, ranging from 15 hours to 15.6 days comprise the ensemble. The sole condition for including each subinterval in the averages is the degree to shich it represents a weakly time-stationary process. Averages obtained by this method are appropriate for a turbulence description of the interplanetary medium. The ensemble average correlation length obtained from all subintervals is found to be 4.9 x 10 to the 11th cm. The average value of the variances of the magnetic field components are in the approximate ratio 8:9:10, where the third component is the local mean field direction. The correlation lengths and variances are found to have a systematic variation with subinterval duration, reflecting the important role of low-frequency fluctuations in the interplanetary medium.
Goldstein Michel L.
King Joseph H.
Matthaeus William H.
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