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Signature of gyro-phase drift

Published online by Cambridge University Press:  08 January 2014

MARK E. KOEPKE ,
J. J. WALKER ,
M. I. ZIMMERMAN ,
W. M. FARRELL  and
V. I. DEMIDOV
MARK E. KOEPKE
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV, 26506, USA ([email protected])
J. J. WALKER
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV, 26506, USA ([email protected])
M. I. ZIMMERMAN
Affiliation:
Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD, 20771, USA
W. M. FARRELL
Affiliation:
Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD, 20771, USA
V. I. DEMIDOV
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV, 26506, USA ([email protected]) University ITMO, Kronverkskiy pr. 49, St. Petersburg 197101, Russia
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Abstract

Gyro-phase drift is a guiding center drift that is directly dependent on the charging rate limit of dust grains. The effect of introducing a gyro-phase-dependence on the grain charge leads to two orthogonal components of guiding-center drift. One component, referred to here as grad-q drift, results from the time-varying, gyro-phase angle dependent, in-situ-equilibrium grain charge, assuming that the grain charging is instantaneous. For this component, the grain is assumed to be always in its in-situ-equilibrium charge state and this state gyro-synchronously varies with respect to the grain's average charge state. The other component, referred to here as the gyro-phase drift, arises from any non-instantaneous-charging-induced modification of the diamagnetic drift and points in the direction of -∇RLd (where RLd is the grain gyro-radius), i.e. the direction associated with increasing magnitude of in-situ-equilibrium charge state. For this component, the grain gyro-synchronously undercharges and overcharges with respect to its gyro-synchronously varying, in-situ-equilibrium charge state. These characteristics are illustrated with a single-particle code for predicting grain trajectory that demonstrates how gyro-phase drift magnitude and direction could be exploited, using an extended version of the presented model, as sensitive indicators of the charging time of dust grains because of the cumulative effect of the ever-changing charge state of a grain making repeated excursions in inhomogeneous plasma over many gyro-periods.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Special Issue 6: Special issue in memory of Professor Padma Kant Shukla 1950-2013 , December 2013 , pp. 1099 - 1105
Copyright
Copyright © Cambridge University Press 2013 

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