On the source region of flux transfer events |
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Authors: | CT Russell J Berchem JG Luhmann |
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Institution: | Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90024, USA |
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Abstract: | We have examined the region of occurrence of flux transfer events for three distinct orientations of the interplanetary magnetic field: nearly horizontal in the solar magnetospheric equator, diagonally southward at 45° to the magnetospheric equator and nearly due south. For horizontal IMF conditions the FTE's occur in a horizontal band about ± 6 RE wide. For diagonally southward IMF conditions, the FTE's occur in a diagonal swath about ± 6 RE wide passing through the subsolar point. For duskward but nearly due southward IMF conditions, our observations reveal FTE's throughout the northern morning quadrant. These observations are consistent with a near equatorial source for flux transfer events and hence with component merging and not anti-parallel merging. These observations also help understand the energetic ion anisotropies seen in these events. |
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