Computer Science
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sci...242.1022b&link_type=abstract
Science (ISSN 0036-8075), vol. 242, Nov. 18, 1988, p. 1022-1027. Navy-supported research.
Computer Science
47
Airglow, Electromagnetic Interactions, Ionospheric Propagation, Night Sky, Traveling Ionospheric Disturbances, Electron Acceleration, Plasma Density, Space Plasmas, Vertical Distribution
Scientific paper
High-power electromagnetic waves beamed into the ionosphere from ground-based transmitters illuminate the night sky with enhanced airglow. The recent development of a new intensified, charge coupled-device imager made it possible to record optical emissions during ionospheric heating. Clouds of enhanced airglow are associated with large-scale plasma density cavities that are generated by the heater beam. Trapping and focusing of electromagnetic waves in these cavities produces accelerated electrons that collisionally excite oxygen atoms, which emit light at visible wavelengths. Convection of plasma across magnetic field lines is the primary source for horizontal motion of the cavities and the airglow enhancements. During ionospheric heating experiments, quasi-cyclic formation, convection, dissipation and reappearance of the cavities comprise a major source of long-term variability in plasma densities during ionospheric heating experiments.
Bernhardt Paul A.
Duncan L. M.
Tepley Craig A.
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