Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa31a1115r&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA31A-1115
Physics
2403 Active Experiments, 2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2483 Wave/Particle Interactions, 1512 Environmental Magnetism
Scientific paper
An approach to expel pollutants which can contribute to global warming from the upper atmosphere by the use of HF electromagnetic waves has been proposed [1]. Laboratory plasma experiments have shown significant gyro-resonance acceleration of minority ion species in a plasma is possible. The separation of ions differing in mass by one unit has been achieved. This method is applicable to the acceleration of selective ions perpendicular to the geomagnetic field in the ionosphere and involves the modulation of the auroral electrojet current to excite ion cyclotron waves. On account of the divergent geomagnetic field in the polar atmosphere the accelerated perpendicular ion velocity is converted into an upward motion along open magnetic field lines. The ions thus removed will not return to the upper 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. By modulating the auroral electrojet in the gyro frequency range for important minority ion species, ion cyclotron waves can be excited which propagate nearly along the magnetic field lines. Experimental evidence for this effect has been obtained with the HIPAS facility [1]. By exciting ELF waves over a range of ion gyro frequencies of dominant ion species, dips were observed in the magnetometer data at these frequencies. This suggests the ELF wave energy was absorbed by the ion species. Similar ion acceleration and expelling phenomenon over the polar regions occurs naturally in so called ion conics as observed by high latitude satellites. Field aligned currents might provide free energy needed to make this process practical. Field experiments are designed to observe directly this selective ion acceleration using the HIPAS Lidar together with ground-based and space-borne detectors. 1. Wong, A.Y. et al. AIP CIP 96-27719, Chap 3, pp 41-75, 1997
Pau Jordi
Quon B.
Rosenthal Gerald
Wong Alfred Y.
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