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Nonlinear guiding center theory of perpendicular diffusion: General properties and comparison with observation

Qin, Gang; Matthaeus, W. H.; Shalchi, Andreas +1 more

A nonlinear guiding center (NLGC) theory for diffusion of charged particles perpendicular to the mean magnetic field was recently proposed. Here, we draw attention to a number of attractive features of this theory: (1) The theory provides a natural mechanism to connect the perpendicular mean free path with the parallel mean free path. In fact, the…

The termination shock near 35° latitude

Burlaga, L. F.; Sheeley, N. R.; Wang, Y. -M. +1 more

The termination shock moves outwards and inwards over timescales of a solar cycle in response to the variations in the average solar wind speed. The amplitude is greater than 50 AU near 35° latitude; the maximum (minimum) distance occurs during the rising (declining) phase of the solar cycle. Shock parameters are distinctly different when the shoc…

Two examples of magnetic clouds with double rotations observed by the Ulysses spacecraft

Forsyth, R. J.; Rees, A.

A survey of Ulysses magnetometer data has been carried out between Oct 1990 (launch) and Apr 2003 (just after the second northern polar pass) cataloguing magnetic cloud (MC) signatures, i.e., a smooth magnetic field rotation and enhanced magnetic field magnitude. After confirming that each of these events was a true MC by checking for a low proton…

Discrete modes and turbulence in a wave-driven strongly magnetized plasma

Matthaeus, William H.; Lanzerotti, Louis J.; Dmitruk, Pablo

We show the coexistence of discrete modes and turbulence in numerical experiments of magnetohydrodynamics with a strong background magnetic field. The particular system we consider is a model of an open magnetic region which we have previously used in coronal heating studies. In the simulations shown here, Alfven waves at discrete frequencies with…

A slow streamer blowout at the Sun and Ulysses

Bemporad, A.; Poletto, G.; Suess, S. T.

On 10 June 2000 a streamer on the southeast limb slowly disappeared from LASCO/C2 over ~10 hours. A small CME was reported in C2. A substantial interplanetary CME (ICME) was later detected at Ulysses, which was at quadrature with the Sun and SOHO at the time. This detection illustrates the properties of an ICME for a known solar source and demonst…

Correction to "Low energy charged particles in the high latitude heliosphere: Comparing solar maximum and solar minimum"

Lanzerotti, L. J.; Gold, R. E.; Maclennan, C. G.