Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm54a..07w&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM54A-07
Physics
2403 Active Experiments, 2407 Auroral Ionosphere (2704), 2483 Wave/Particle Interactions (7867), 6984 Waves In Plasma (7867)
Scientific paper
An approach to expel minority species which can contribute to global warming from the upper atmosphere in the Arctic region by the use of HF electromagnetic waves has been proposed [1]. Laboratory plasma experiments have been designed to model various aspects of this concept - from the acquisiton of negative charges by green house gases such as CO2 to their ascent to the upper atmosphere and their acceleration and expulsion along the open magnetic field lines. Laboratory results are presented which confirmed the efficient gyro-resonance acceleration of minority ion species made possible through the space charge cancellation by majority species. The outflow of CO2 ions from the divergent magnetic field of a laboratory plasma device is measured at various background neutral pressures and for different amount of currents along the axial magnetic field. The central idea is to impart perpendicular energy to a selective ion species gyrating around the geomagnetic field at its cyclotron resonance. The wave field is produced by either modulating the auroral electrojet or from the nonlinear interaction between two electron plasma resonances. In the presence of the divergent polar geomagnetic field the accelerated perpendicular ion velocity is converted into an upward motion along open magnetic field lines. The ions thus removed will unlikely find their way back to the lower atmosphere. Negatively charged particles move upward by the fair-weather electric field and by atmospheric convection. When these ions reach above 120 km altitude where the ion gyro frequency is comparable to or greater than the ion- neutral collision frequency, they can be accelerated by EM fields through the gyro resonance interaction. The propagation of these low frequency waves to the upper atmosphere along the earth's magnetic field is permitted by the plasma dispersion relation. Laboratory experiments play an important role in confirming the theoretical prediction that ion cyclotron waves can grow in the presence of an axial electron current. This allows the utilization of free energy sources in the auroral ionosphere to expel the selected species. The feasibility of this concept depends on how efficiently the free energy can be directed towards this remediation. Experimental excitation of these low frequency waves using the HIPAS facility will be presented. By exciting ELF waves over a range of ion gyro frequencies of dominant ion species, dips were observed in the low frequency magnetometer at these frequencies suggesting that the ELF wave energy was absorbed by ion species at specific frequencies. Ion acceleration and expelling phenomenon over the polar regions have been observed by high latitude satellites as a natural process. A method of using the ground-based HIPAS LIDAR to directly observe this selective ion acceleration will be presented along with laboratory laser- induced- fluorescent experiments on doppler shifts. 1. Wong, A.Y. et al. AIP CIP 96-27719, Chap 3, pp 41-75, 1997
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