Multi-Tube Model and Complexity of Interplanetary Magnetic Clouds.

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7513 Coronal Mass Ejections, 7524 Magnetic Fields

Scientific paper

The recently formulated multi-tube model for a magnetic cloud is based on exact MHD bounded state solutions [Osherovich, Fainberg and Stone, 1999] which describe magnetically interacting helices embedded in a cylindrical flux rope. We present March 4-7, 1998 Wind observations of a magnetic cloud which illustrate the model. The log-log plot of electron temperature Te versus density Ne shows two straight lines with negative slopes suggesting that the polytropic indices for the 2 tubes are below unity (γ e < 1). Similar results were obtained from Ulysses observations at 5.4 AU for the same cloud and for another cloud observed on June 10-13, 1993 by Ulysses [Fainberg et al., 1996]. The boundary between the two tubes in this cloud is marked by a significant increase in the density and abnormal rotation of B. Such a divider, being a magnetic separatrix, is formed by proton dominated Maxwellian plasma whereas inside the two tubes, the main contribution to the total gas pressure comes from a non-Maxwellian electron component. References: Fainberg, J. et al., Proc. Solar Wind 8 Conference, Dana Point, CA., eds. D. Winterhalter, J.T. Gosling, S.R. Habbal, W.S. Kurth and M. Neugebauer, 554, 1996. Osherovich, V.A., J. Fainberg and R.G. Stone, Geophys. Res. L., 26(3), 401, 1999.

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