Abstract
The potential and density wake behind a finite-sized object in a magnetized collisionless plasma flow is studied with self-consistent numerical simulations. With increasing magnetization of the plasma, the standard picture of ion focusing in the wake for plasmas with large electron to ion temperature ratios becomes invalid. A strong magnetic field parallel to the flow direction leads to a chain of ion depletions in the wake and enhanced ion density at their envelopes. This is due to a novel mechanism of a dynamic ion shadow, which is not the geometrical shadow of the finite-sized object. It corresponds to a change in topology of the wake potential. Complex ion trajectories resulting from electrostatic collisions with the object can lead to significant variations in electrical charging of other objects in the wake.
Highlights
Interactions of plasmas with finite-sized objects, such as dust particles and probes in laboratory plasmas or spacecrafts in the magnetosphere, are fundamental problems in the physics of plasmas [1,2,3,4,5]
Wake effects have notable implications on the probe measurements in laboratory experiments [1], interpretation of data from spacecrafts [2], and charging and dynamics of systems comprising two or more dust particles exposed to the plasma flow, such as in complex plasmas [5, 6]
The charging becomes increasingly anisotropic, and static magnetic shadowing, characterized by geometrical plasma depletion in the wake due to plasma absorption at the object, gets pronounced. This is in addition to dynamic ion shadowing which is related to strong scattering of plasma particles at the object for large βi as it is demonstrated in this paper
Summary
With increasing magnetization of the plasma, the this work must maintain attribution to the standard picture of ion focusing in the wake for plasmas with large electron to ion temperature ratios author(s) and the title of becomes invalid. A strong magnetic field parallel to the flow direction leads to a chain of ion depletions the work, journal citation and DOI. In the wake and enhanced ion density at their envelopes. This is due to a novel mechanism of a dynamic ion shadow, which is not the geometrical shadow of the finite-sized object. It corresponds to a change in topology of the wake potential. Complex ion trajectories resulting from electrostatic collisions with the object can lead to significant variations in electrical charging of other objects in the wake
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