Irregularities Associated with Artificially Created Dusty Plasmas in the near Earth Space Environment

Details Irregularities Associated with Artificially Created Dusty Plasmas in the near Earth Space Environment Irregularities Associated with Artificially Created Dusty Plasmas in the near Earth Space Environment

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21a1440b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA21A-1440

Physics

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

Scientific paper

A natural dust layer formed by tons of meteoric dust spans the altitude range between 80 and 100 kilometers of the earth’s upper mesosphere and lower thermosphere which forms Noctilucent Clouds NLCs. These dust layers are charged due to collection of electrons and ions from the earth’s ionosphere. Polar Mesospheric Summer Echoes are radar echoes which result from scattering from the irregularities in the electron density above the NLC altitude. An alternate approach to understanding natural dust layers is to perform active space experiments in which a dust cloud is artificially created in a controlled manner in the upper atmosphere. The goal of Charged Aerosol Release Experiment (CARE) is to investigate similarity in plasma irregularity associated with natural and artificial dust layers. This presentation will address some of the physical processes expected to be important during the early time phase after creation of an artificial dust cloud in the earth’s ionosphere. Of major importance will be the production of plasma irregularities which may lead to radar echoes and the possibility of their relationship to PMSEs observed from natural dusty space plasmas. The objective is to investigate the production of electron irregularities due to growth of plasma instabilities driven by inhomogeneities in the boundary between the background plasma and the expanding charged dust layer. First, a two dimensional plasma simulation model will be described that may be used for examining early time evolution after expansion of an artificial dust cloud across the magnetic field in the ionosphere. The model considers a three species system with fluid electrons and ions and Particle-In-Cell PIC charged dust grains in which the dust charge on the grains varies in time according to the standard charging model. The electrons are magnetized and the algorithm incorporates the parallel electron dynamics while the ions are assumed to be unmagnetized. Simulations runs were made to study irregularities with different dust densities, radii, and expansion speed and inclination angle of magnetic field with respect to dust expansion direction. The mechanism is shown to effectively generate irregularities for early times after localized release dust for the parameter regimes of upcoming space experiments.

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