HR: 1340h
AN: SH43A-1099    [Abstracts]
TI: The Gradient/Curvature Drift of Cosmic Rays in the Heliospheric Magnetic Fields with Turbulence
AU: * Ball, B M
EM: bball@cr1.pss.fit.edu
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AU: Zhang, M
EM: mzhang@galileo.pss.fit.edu
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AU: Qin, G
EM: gqin@fit.edu
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AU: Rassoul, H
EM: hrassoul@fit.edu
AF: Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 United States
AB: Although various observations of cosmic ray modulation indicate that the effects of gradient/curvature particle drift should be reduced from its full drift in the average Parker heliospheric magnetic field, there is no theory for the calculation of particle drift in a magnetic field with turbulence. We present here a new approach to this problem, using an orbit tracing method for the calculation of drift. The solution is a direct numerical integration of the basic expression for drift as presented in Rossi and Olbert [1970]. The same technique was previously used to calculate the drifts in the Parker field for particles with an isotropic distribution. The drift speed agrees with the first order drift approximation when the particle gyroradius is much less than the scale size of magnetic field gradient. In this case, we include a more complicated magnetic field which contains both slab and 2D components of turbulence [Bieber et al, 1994; Qin et al, 2002]. It is expected that the turbulence will alter the particle trajectory, thus changing the behavior of the particle drift. Its implications to cosmic ray modulation will also be discussed
DE: 7859 Transport processes
DE: 7863 Turbulence
DE: 2104 Cosmic rays
DE: 2114 Energetic particles, heliospheric (7514)
DE: 2194 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting