Statistics – Applications
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..552..488o&link_type=abstract
Space Technology and Applications International Forum - 2001. AIP Conference Proceedings, Volume 552, pp. 488-493 (2001).
Statistics
Applications
Electric Fields, Current System, Spaceborne And Space Research Instruments, Apparatus, And Components, Observation And Data Reduction Techniques, Computer Modeling And Simulation
Scientific paper
An electrodynamic bare tether has been considered as an alternative method of propulsion without expenditure of propellant. The object of the work reported here is the development of a numerical method, Particle-In-Cell (PIC) method, for the calculation of electron current to a positive bare tether moving at orbital velocity in the ionosphere, i.e. in a flowing magnetized plasma under Maxwellian collisionless conditions. In a PIC code, a number of particles are distributed in phase space and the computational domain has a grid on which the Poisson equation is solved for field quantities. The code uses the quasi-neutrality condition to solve for the local potential at points in the plasma which coincide with the computational outside boundary. Given the boundary conditions, Poisson equations is solved in such a way that the presheath region can be captured in the computation. Electrons are assumed to have a Maxwellian distribution at the boundary due to their high mobility, whereas ions are assumed so only in the far upstream region and are also assumed to only decelerate one-dimensionally due to their large mass. Results show that the collected current is higher than the Orbital Motion Limit (OML) theory. As a possible cause of this current enhancement, field oscillation has been recognized and also some numerical effects have been detected. .
Cooke David L.
Martinez-Sanchez Manuel
Onishi Tatsuo
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