Date of Graduation
2015
Document Type
Dissertation
Degree Type
PhD
College
Eberly College of Arts and Sciences
Department
Physics and Astronomy
Committee Chair
Mark E Koepke
Committee Co-Chair
Paul Cassak
Committee Member
David Lewellen
Committee Member
Maura McLaughlin
Committee Member
Earl Scime
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 grad-q drift and points in the direction associated with increasing magnitude of in-situ-equilibrium charge state. Gyro-synchronous grain charge modulation may arise from either abrupt or gradual inhomogeneity in plasma conditions. In the abrupt inhomogeneity, q1 is the in-situ-equilibrium charge on one side of the inhomogeneity, q2 is the in-situ equilibrium charge on the other side, q1 Gyro-synchronous grain charge modulation may arise from either abrupt or gradual inhomogeneity in plasma conditions. In the abrupt inhomogeneity, q1 is the in-situ-equilibrium charge on one side of the inhomogeneity, q2 is the in-situ equilibrium charge on the other side, q1.
Recommended Citation
Walker, Jeffrey J., "Fine-Particle Charging-Rate-Limit Modification to Grain Dynamics in Abrupt and Gradual Inhomogeneities" (2015). Graduate Theses, Dissertations, and Problem Reports. 6889.
https://researchrepository.wvu.edu/etd/6889
