Computer Science – Sound
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..137b&link_type=abstract
Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, April 1986, p. 137-143.
Computer Science
Sound
1
E Region, Eiscat Radar System (Europe), F Region, Ionospheric Ion Density, Ionospheric Sounding, Ionospheric Propagation, Photoelectrons, Radar Scattering
Scientific paper
Photoelectron excited plasma lines were observed with the EISCAT UHF radar in July 1984 for altitudes between 112 and 290 km. Plasma-line frequencies lie between 2.9 and 5.0 MHz, corresponding to phase energies between 0.6 and 1.8 eV. Simultaneous ion-line measurements were made so that plasma-line intensities could be derived. The maximum intensity obtained was about 0.6 eV. The maximum plasma-line enhancement was about 20 times the thermal level and was found to occur just above the E-region peak. Above 190 km no significant enhancement occurred due to an increased thermal Landau damping. Experimental values are compared with theoretical values predicted by a particular power-law photoelectron distribution function. Qualitative agreement is found between theory and experiment.
Bjorna Noralv
Kirkwood Sheila
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