Search NASA⌕ Search

Engineering topics

Dick, K. A.

Publications and source records attributed to Dick, K. A..

13 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1976

Studies of molecular nitrogen bands from airborne auroral spectroscopy

Absolute auroral emission rates of several bands of the 1 PG (first positive), 2 PG, and Vegard-Kaplan systems of N2 and of the 1 NG (first negative) system of N2(+) were obtained from simultaneous spectral scans of two Ebert spectrophotometers mounted on board the NASA CV 990 aircraft. Analysis of these bands emitted during a 2-min auroral event leads to some conclusions regarding the excitation mechanisms of the C(3)Pi, B(3)Pi, and A(3)Sigma levels: the v' = 0 to v' = 3 levels of the C(3)Pi electronic state are populated by electron impact; the cross sections predict absolute emission rates that are in good agreement with the observations. Cross sections for excitation of the v' = 4 to v' = 8 levels, derived from laboratory measurement of the optical excitation functions, predict well the 1 PG bands observed in the auroral event.

Rees, M. H.↗
NASA NTRS1972

Temporal variations in night-time hydroxyl rotational temperature.

Airborne and groundbased OH measurements showing short-term temporal variations in OH rotational temperature are presented. These variations are interpreted in terms of a dynamic model of the OH emitting layer in which the intensity variations result from the changes in temperature the OH layer undergoes as it moves during the night.

Sivjee, G. G.↗