Modeling of Plasma Irregularities in Expanding Ionospheric Dust Clouds

Details Modeling of Plasma Irregularities in Expanding Ionospheric Dust Clouds Modeling of Plasma Irregularities in Expanding Ionospheric Dust Clouds

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21a1442f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA21A-1442

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[2403] Ionosphere / Active Experiments, [2439] Ionosphere / Ionospheric Irregularities, [2461] Ionosphere / Plasma Interactions With Dust And Aerosols, [2471] Ionosphere / Plasma Waves And Instabilities

Scientific paper

Natural dust layers occur in the earth’s mesosphere (50km-85km). Plasma irregularities are associated with these natural dust layers that produce radar echoes. Recently, an Ionospheric sounding rocket experiment was performed to investigate the plasma irregularities in upper atmospheric dust layers. The Charged Aerosol Release Experiment (CARE) uses a rocket payload injection of particles in the ionosphere to determine the mechanisms for enhanced radar scatter from plasma irregularities embedded in artificial dusty plasma in space. A 2-D hybrid computational model is described that may be used to study a variety of irregularities in dusty space plasmas which may lead to radar echoes. In this model, the dust and ions are both treated with Particle-In-Cell method while the dust charge varies with time based on the standard dust Orbit Motion Limited charging model. A stochastic model is adopted to remove particle ions due to the dust charging process. Electrons are treated with a fluid model including the parallel dynamics of magnetic fields. Fourier spectral methods with a predictor-corrector time advance are used to solve it. This numerical model will be used to investigate the electrodynamics and several possible plasma irregularity generation mechanisms after the creation of an artificial dust layer. The first is the dust ion-acoustic instability due to the drift of dust relative to the plasma. The instability saturates by trapping some ions. The effects of dust radius and dust drift velocity on plasma irregularities will be analyzed further. Also, a shear- driven instability in expanding dusty clouds is investigated.

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