Other
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.8139b&link_type=abstract
Journal of Geophysical Research, vol. 87, Oct. 1, 1982, p. 8139-8148.
Other
75
Crossings, Geomagnetism, Gyromagnetism, International Sun Earth Explorer 1, International Sun Earth Explorer 2, Magnetopause, Crossed Fields, Earth Magnetosphere, Hodographs, Magnetosheath, Resolution, Rotating Plasmas
Scientific paper
ISEE 1 and 2 magnetic field data obtained during dayside magnetopause crossings are analyzed using a minimum variance technique in order to determine the characteristics of the rotation of the magnetic field across the magnetopause. Only a small fraction of the magnetopause crossings examined present a sufficiently coherent structure that they can be compared with theoretical predictions and only a few of the hodograms of the magnetic field at the crossings display the ideal rotation expected for a rotational discontinuity structure. It is found that the observed senses of rotation are not consistent with the predictions of the electron whistler polarization theory. Rotations exceeding 180 deg are very seldom observed; they usually occur across multiple crossings, either as 360 deg rotation about the minimum variance direction or, occasionally, in more complicated patterns associated with S-shaped hodograms. These observations are seen as indicating that the sense of the magnetic field rotation through the magnetopause is controlled by the relative orientation of the magnetosheath and the magnetospheric field and that the angular rotation is minimized when the magnetic field changes from one orientation to the other.
Berchem Jean
Russell Christopher T.
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