Analytical model for gyro-phase drift arising from abrupt inhomogeneity

作者：Walker Jeffrey J^*; Koepke M E; Zimmerman M I; Farrell W M; Demidov V I

来源：Journal of Plasma Physics, 2014, 80(3): 395-404.

DOI：10.1017/S0022377813001359

If a magnetized-orbit-charged grain encounters any abrupt inhomogeneity in plasma conditions during a gyro-orbit, such that the resulting in-situ equilibrium charge is significantly different between these regions (q(1)/q(2) similar to 2, where q(1) is the in-situ equilibrium charge on one side of the inhomogeneity, q(2) is the in-situ equilibrium charge on the other side, and q(1) %26lt; q(2) %26lt; 0), then the capacitive effects of charging and discharging of the dust grain can result in a modification to the orbit-averaged grain trajectory, i.e. gyro-phase drift. The special case of q(1)/q(2) is notioned for the purpose of illustrating the utility of the method. An analytical expression is derived for the grain velocity, assuming a capacitor approximation to the OML charging model. For cases in which a strong electric field suddenly appears in the wake or at the space-plasma-to-crater interface from solar wind and/or ultraviolet illumination and in which a magnetic field permeates an asteroid, comet, or moon, this model could contribute to the interpretation of the distribution of fields and particles.

• 出版日期2014-6