Computer Science – Sound
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..565k&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, June-July 1984, p. 565-575.
Computer Science
Sound
17
Arctic Regions, D Region, Eiscat Radar System (Europe), Ionospheric Sounding, Mesosphere, Ionospheric Electron Density, Line Spectra, Mesopause, Negative Ions, Radar Echoes
Scientific paper
A brief outline is given of the experimental technique used during the Cold Arctic Mesopause Project (CAMP) to record the first D-region ion line spectra with the EISCAT incoherent-scatter radar. The data analysis shows that echoes from mesospheric heights between about 70 km and 90 km can be detected during disturbed periods of enhanced electron density during particle-precipitation events. Electron-density profiles were determined which show a fairly high density, up to 5 x 10 to the 10th/cu m in the upper D-region. The measured meridional winds were lower than 10 m/s. A fit of the measured height profile of spectral width to temperature and neutral-density models yielded a measured temperature profile in good agreement with simultaneous rocket data. The mesopause temperature was determined to be as low as 130 K. This detailed analysis of the spectral-width profile indicates that below about 77-80 km the ratio of negative ions to electrons exceeded unity. Finally, some discussions are added on the limitations and significance of these first mesosphere observations.
Bertin Francois
Cremieux A.
Kofman Wlodek
Roettger Juergen
Williams J. S. P.
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