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Experiments are reported where a collisionfree plasma cloud penetrates amagnetic barrier by self-polarization. We here focus on the resulting anomalousmagnetic field diffusion into the plasma cloud, two orders of magnitude fasterthan classical, which is one important aspect of the plasma cloud penetrationmechanism. Without such fast magnetic diffusion, clouds with kinetic beta belowunity would not be able to penetrate magnetic barriers at all. Tailor-madediagnostics has been used for measurements in the parameter range with thekinetic beta ? 0.5 to 10, and with normalized width w/r(gi) of the order ofunity. Experimental data on hf fluctuations in density and in electric fieldhas been combined to yield the effective anomalous transverse resistivityeta(EFF). It is concluded that they are both dominated by highly nonlinearoscillations in the lower hybrid range, driven by a strong diamagnetic currentloop that is set up in the plasma in the penetration process. The anomalousmagnetic diffusion rate, calculated from the resistivity eta(EFF), isconsistent with single-shot multi-probe array measurements of the diamagneticcavity and the associated quasi-dc electric structure. An interpretation of theinstability measurements in terms of the resistive term in the generalized (lowfrequency) Ohm's law is given.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004,  Nice (France

The penetration of plasma clouds across magnetic boundaries: The role of high frequency oscillations