Rocket-borne wave measurements in the dayside auroral oval

Details Rocket-borne wave measurements in the dayside auroral oval Rocket-borne wave measurements in the dayside auroral oval

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2915t&link_type=abstract

Journal of Geophysical Research, vol. 85, June 1, 1980, p. 2915-2924.

Computer Science

Sound

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Auroral Zones, Extremely Low Radio Frequencies, Hiss, Ionospheric Sounding, Rocket Sounding, Very Low Frequencies, Barium Ion Clouds, Daytime, Electron Precipitation, Electrostatic Waves, Ion Injection, Ionospheric Ion Density, Nitric Oxide, Oxygen Ions, Vlf Emission Recorders

Scientific paper

VLF and ELF waves were measured on two rocket payloads launched into the dayside auroral oval on Dec. 18, 1974, and on Jan. 11, 1975. The correlation of the VLF hiss intensity with the fluxes of precipitating electrons above 500 eV on short spatial and time scales was often poor, even when a positive slope existed in the electron phase space density. During the flight in 1975, distinct features were observed at the lower hybrid frequency; the frequency of this emission was used together with an independent density measurement to determine the relative concentration of O(+) to the heavier ions NO(+) and O2(+). It was found that the density of NO(+) or O2(+), which could not be distinguished, is enhanced over expected values between 150 and 400 km altitude. Broadband electrostatic and electromagnetic waves were observed after the barium-shaped charged explosion in 1975; the observed lowering of the auroral VLF hiss cutoff due to the barium is consistent with either ducting of VLF hiss emissions along the enhanced density duct produced by the barium or with local generation VLF hiss during the barium injection.

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