an introduction to magnetohydrodinamics by Davidson

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DUNLOP ET AL. when repeated motion of high-altitude cusp resulted in the spacecraft encountering the dayside magnetospheric boundary, and then magnetosheath. The spacecraft entered the cusp throat at around 04:08 UT, as suggested by increased ULF wave activity, apparent as increased fluctuations in |B| in the lower panel of Figure 10. The spacecraft traversed the throat during the next hour, and appeared to move to higher altitudes during this time in a manner almost as inferred by the model field lines and orbit track, shown in the top panel of Figure 10.

This interpretation that the field depressed high-latitude region is the exterior cusp raises the issue of whether the outer or inner boundaries represent the MAGNETIC STRUCTURE AND DYNAMICS 51 extension of the magnetopause. , 2003). The inner boundary, on the other hand, also shows magnetopause-like properties in that there is always a clear magnetic transition representing a current sheet form. The nature of this inner boundary, however, depends on location up the cusp throat, and is not magnetically well defined deeper into mid-altitudes because of the relative diamagnetic effect.

Schematic of the cusp crossings: northern geometry. W. DUNLOP ET AL. The DA analysis also suggests that the funnel boundary is slightly thinner on the equatorward edge, and is 1000 km overall. A second entry, between 05:56 and 06:02 UT, represents a reversal in and out of what could possibly be the exterior cusp region (at least sampling at higher altitudes than the throat crossings). The spacecraft are again originally equatorward and on the duskside of the cusp. 85). 7), appears to correspond to the extreme edge of the cusp (and corresponds in orientation to an indented magnetopause).

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