AGU Fall Meeting location:San Francisco, California date:10-14 December 2007
We address the coupling of drift instabilities in the lower-hybrid range with the large scale dynamics of the magnetotail. We consider two ways in which microinstabilities affect large scales: anomalous resistivity and large scale momentum creation. First, on anomalous resistivity, we present a new approach to analyze non- linear kinetic simulations and to extract the role of wave-particle interaction in momentum creation. The approach is applied to the lower-hybrid drift instability where it is shown that the anomalous resistivity generated does not penetrate in the plasma even when electromagnetic fluctuations are considered. Second, on large-scale momentum creation we show how fluctuations in the drift range lead to large scale momentum creation over the whole magnetotail region. An analogy with spontaneous momentum creation in laboratory plasmas (focusing especially on Alcator C-Mod [W. D. Lee and et al., Phys. Rev. Lett. 91, 205003 (2003)]) will be presented.