Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12b0761m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH12B-0761
Physics
2111 Ejecta, Driver Gases, And Magnetic Clouds, 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma
Scientific paper
A magnetic flux rope model is widely accepted as a model to explain the internal magnetic structure ejected into interplanetary space in association with coronal mass ejections. Its global configuration is proposed to be loop-shaped structure extending from the Sun with both ends rooted to the Sun, and deformed to match the Parker spiral. If the interplanetary flux ropes really have such configuration, a cylindrical model can explain the observed magnetic field variations only for those cases where the spacecraft traversed the central part of the loop. A torus model can be used as a proxy of such configuration to explain magnetic field variations observed when the spacecraft traversed the curved portions of such a global configuration. This is an attempt to investigate the validity of the torus model for interplanetary magnetic flux ropes by examining the direction of discontinuities often detected at the boundaries of interplanetary flux ropes. The analysis was made for four different types of events. They are (1) cases in which the directions of magnetic field vectors are maintained rather unchanged, (2) cases in which the rotation of magnetic field vectors changes from clockwise to anti-clockwise, or vice versa, (3) cases in which magnetic field vectors rotate by about 360 degrees, and (4) cases in which magnetic field vectors rotate angles only slightly larger than 180 degrees. The result shows that the planes of discontinuities are generally parallel to the flux rope axes, providing a strong support for the validity of the torus model, or the proposed global configuration of the interplanetary magnetic flux rope. It is particularly interesting to note that though both a cylinder model and a torus model can sometimes be reasonably well fitted to observed magnetic fields for those cases in (4) the two models give completely different directions for the flux rope axis.
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