OBSERVATIONS OF A QUASI-STATIC PLASMA SHEET BOUNDARY

No high-speed flows or discernible counterstreaming ion beams were obs erved during a series of plasma sheet boundary encounters resulting fr om solar wind-driven plasma sheet motions. We conclude that the bounda ry may be active primarily during plasma sheet ''recovery''. A tempora l onset of flows in the inner plasma sheet (IPS) was associated with t he appearance of counterstreaming beams embedded in an already isotrop ic plasma sheet distribution, suggesting that high speed flows at the plasma sheet boundary and close to the neutral sheet may have a common generation mechanism.