Magnetic clouds and force-free fields with constant alpha

Details Magnetic clouds and force-free fields with constant alpha Magnetic clouds and force-free fields with constant alpha

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7217b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7217-7224.

Physics

290

Field Theory (Physics), Helices, Lorentz Force, Magnetic Clouds, Magnetic Field Configurations, Magnetohydrodynamics, Perturbation Theory, Steady State

Scientific paper

Magnetic clouds observed at 1 AU are modeled as cylindrically symmetric, constant alpha force-free magnetic fields. The model satisfactorily explains the types of variations of the magnetic field direction that are observed as a magnetic cloud moves past a spacecraft in terms of the possible orientations of the axis of a magnetic cloud. The model also explains why the magnetic field strength is observed to be higher inside a magnetic cloud than near its boundaries. However, the model predicts that the magnetic field strength profile should be symmetric with respect to the axis of the magnetic cloud, whereas observations show that this is not generally the case.

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