Computer Science – Sound
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31...49s&link_type=abstract
(American Geophysical Union, Spring Meeting, Philadelphia, PA, May 31-June 9, 1982.) Planetary and Space Science, vol. 31, Jan.
Computer Science
Sound
1
Atmospheric Chemistry, Atmospheric Composition, Auroral Ionization, Altitude, Molecular Ions, Nitrogen, Nitrogen Oxides, Oxygen Ions, Reaction Kinetics, Rocket Sounding
Scientific paper
For nighttime auroras, it is found that positive ion ratios are only a function of the neutral atmospheric composition and of the pertinent ionic processes if the ions are depleted mainly by ion-molecule reactions. Ionic ratios calculated for N(+)/N2(+) using the 1976 U.S. Standard Atmosphere and laboratory rate coefficients (with one exception) rise smoothly with altitude: 0.1 (120 km), 0.3 (140 km), 0.6 (160 km), 1.0 (180 km) and 1.5 (200 km). These values compare favorably with experimental ratios from three different auroral experiments. The exception refers to the use of a larger rate coefficient for N2(+) + O yields NO(+) + N than found in the laboratory. An N2(+)/O(+) ratio is also determined with altitude: 0.36 (120 km), 0.078 (140 km), 0.030 (160 km), 0.014 (180 km) and 0.0075 (200 km). These values compare favorably with results from the same three auroral experiments. However, the match with a fourth auroral experiment is poor. Except for this last case, it is concluded that the neutral composition at auroral latitudes in late winter is similar to the U.S. Standard for the altitudes examined.
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