Computer Science – Sound
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617865j&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,865-17,878.
Computer Science
Sound
9
Auroral Zones, Ionospheric Propagation, Radio Emission, Rocket Sounding, Bistatic Reflectivity, Earth Magnetosphere, Plasma Waves, Propagation Modes, Tethering
Scientific paper
Observations are presented from the tethered sounding rocket payload OEDIPUS A (Observations of Electric-Field Distributions in the Ionospheric Plasma, a Unique Strategy), which is a large double probe that includes a high-frequency exciter, HEX, and the receiver for exciter, REX, for direct measurements of the magnetic field-aligned dc electric field E-parallel in the auroral topside ionosphere. Synchronized sweeps of the frequency range 0-5 MHz by the 2-W transmitter HEX on the upper end of the tether and its associated REX on the lower end have produced signatures of quasi-electrostatic waves guided along field-aligned depletions of ambient density. The ability of the HEX to make ionospheric irregularities 'ring' at frequencies around 2.5 MHz is interpreted in terms of guided Z mode waves, whose propagation is between the plasma frequency f(p) and the upper hybrid resonance frequency, when f(p) is greater than the cyclotron frequency.
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