Magnetic flux and particle transport in the plasma sheet

[ 1] Sets of 12 long-term averaged three-dimensional (3-D) data-based models were created to show how the structure of the plasma sheet depends upon particle transport rates and upon magnetic flux transport rates. The volume V and content N of unit flux tubes and the entropy parameters PV5/3 and TV2/3 were evaluated for each model. It was found that V and PV5/3 depend only weakly on the transport rates. In contrast, N was much smaller and TV2/3 was much larger when the transport rates were large. Most parameters depended strongly upon x. The long-term averaged x dependence of PV5/3 was closely associated with the x dependence of N. Earthward and tailward transport nearly cancelled during periods of slow and moderate flow. The transport and spatial dependence of the measured variables therefore were attributed primarily to the confined, intermittent, high-temperature, low-density, fast or bursty bulk flows. Several mechanisms were described that can contribute to the observed earthward decreases of N and of PV5/3 or to the pressure balance inconsistency. A sequence of events involving reconnection was shown to be one mechanism that is capable of producing the observed spatial variations.