Night airglow hydroxyl rotational temperatures

1970 ◽  
Vol 48 (15) ◽  
pp. 1766-1768 ◽  
Author(s):  
A. W. Harrison ◽  
E. J. Llewellyn ◽  
D. C. Nicholls
Keyword(s):  
Rotational Temperature ◽  
Apparent Increase ◽  
Night Airglow

Rotational temperatures have been determined from observations of the OH emission in the night airglow. It is proposed that an apparent increase in the derived rotational temperature with the value of K′ may be explained in terms of a nonisothermal emitting region.

Study of the (4–1) and (5–2) Hydroxyl Bands in the Night Airglow

1971 ◽  
Vol 49 (19) ◽  
pp. 2509-2517 ◽  
Author(s):  
A. W. Harrison ◽  
W. F. J. Evans ◽  
E. J. Llewellyn
Keyword(s):  
Seasonal Variation ◽  
Rotational Temperature ◽  
Band Intensity ◽  
K Value ◽  
Intensity Fluctuations ◽  
Single Night ◽  
Summer Minimum ◽  
Night Airglow

A 1 year study of the (4–1) and (5–2) hydroxyl bands in the night airglow near 1 μ has revealed a non-uniform rotational temperature across the P branch of each band. The temperature increases with K′ value. There is a pronounced seasonal variation of temperature showing a summer minimum and winter maximum. The average measured brightness for the (4–1) band is 4.6 kR (winter) and 3.5 kR (summer), and for the (5–2) band is 5.8 kR (winter) and 4.3 kR (summer). It is shown that the time-averaged total band intensity fluctuations during a single night are quite large, sometimes a factor of 2, and are not definitely correlated with the rotational temperature during the same period.

Spectrum of the night airglow between 3 and 4 microns

1968 ◽  
Vol 46 (23) ◽  
pp. 2575-2578 ◽  
Author(s):  
R. MacDonald ◽  
H. L. Buijs ◽  
H. P. Gush
Keyword(s):  
Rotational Temperature ◽  
Rotational Structure ◽  
Intensity Analysis ◽  
Prominent Feature ◽  
Night Airglow

The spectrum of the night airglow has been measured between 3 and 4 μ at a limit of resolution of 4 cm−1, the observations being made at an altitude of 95 000 feet. The most prominent feature of the spectrum is the Δν = 1 sequence of hydroxyl bands. An intensity analysis of the rotational structure yields a rotational temperature of 234 °K. In addition, the ν3 band of methane near 3000 cm−1 and the ν3 band of CO2 near 2350 cm−1 appear in emission.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

Effects of a large mesospheric temperature enhancement on the hydroxyl rotational temperature as observed from the ground

2001 ◽  
Vol 106 (A12) ◽  
pp. 30381-30388 ◽  
Author(s):  
Stella M. L. Melo ◽  
R. P. Lowe ◽  
W. R. Pendleton ◽  
M. J. Taylor ◽  
B. Williams ◽  
...  
Keyword(s):  
Rotational Temperature ◽  
Mesospheric Temperature ◽  
Temperature Enhancement

Rotational temperature imaging of a leading-edge separation in hypervelocity flow

2019 ◽  
Author(s):  
Laurent M. Le Page ◽  
Matthew Barrett ◽  
Sean O’Byrne ◽  
Sudhir L. Gai
Keyword(s):  
Rotational Temperature ◽  
Leading Edge ◽  
Temperature Imaging ◽  
Edge Separation
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