Measurement of rate constant for quenching CO 2 (0110) by atomic oxygen at low temperatures: reassessment of the population of CO 2 (0110) and the CO 2 15-μm emission cooling in the lower thermosphere

2003 ◽  
Author(s):  
Gustav M. Shved ◽  
Lyudmila E. Khvorostovskaya ◽  
Igor Y. Potekhin ◽  
Vladimir P. Ogibalov ◽  
Tatyana V. Uzyukova
Keyword(s):  
Rate Constant ◽  
Low Temperatures ◽  
Atomic Oxygen ◽  
Lower Thermosphere

OSAS-B: a balloon-borne heterodyne spectrometer for sounding atomic oxygen in the MLT region

2021 ◽  
Author(s):  
Martin Wienold ◽  
Alexey Semenov ◽  
Heiko Richter ◽  
Heinz-Wilhelm Hübers
Keyword(s):  
Atomic Oxygen ◽  
Near Infrared ◽  
Lower Thermosphere ◽  
Local Oscillator ◽  
Hot Electron ◽  
Water Vapor Absorption ◽  
Mesosphere And Lower Thermosphere ◽  
Spectrally Resolved ◽  
Heterodyne Spectrometer ◽  
Mlt Region

<p>The Oxygen Spectrometer for Atmospheric Science on a Balloon (OSAS-B) is dedicated to the remote sounding of atomic oxygen in the mesosphere and lower thermosphere (MLT) region of Earth's atmosphere, where atomic oxygen is the dominant species. Quantitative radiometry of atomic oxygen via its visible and near-infrared transitions has been difficult, due to the complex excitation physics involved. OSAS-B is a heterodyne spectrometer for the thermally excited ground state transition of atomic oxygen at 4.75 THz. It will enable spectrally resolved measurements of the line shape,  which in turn enables the determination of the concentration of atomic oxygen in the MLT. Due to water absorption, this line can only be observed from high-altitude platforms such as a high-flying airplanes, balloons or satellites. Recently the first spectrally resolved observation of the 4.75-THz line has been reported using a heterodyne spectrometer on SOFIA, the Stratospheric Observatory for Infrared Astronomy [1]. Compared to SOFIA a balloon-borne instrument has the advantage of not being hampered by atmospheric water vapor absorption. OSAS-B will comprise a hot-electron bolometer mixer and a quantum-cascade laser as local oscillator in a combined helium/nitrogen dewar. A turning mirror will allow for sounding at different vertical inclinations. The  first flight of OSAS-B is planned for autumn 2022 in the frame of the European HEMERA project [2].</p><p>[1] H. Richter et al., Direct measurements of atomic oxygen in the mesosphere and lower thermosphere using terahertz heterodyne spectroscopy, accepted for publication in Communications Earth & Environment (2021).</p><p>[2] https://www.hemera-h2020.eu/</p>

scholarly journals Effects of the planetary waves on the MLT airglow

2017 ◽  
Vol 35 (5) ◽  
pp. 1023-1032 ◽  
Author(s):  
Fabio Egito ◽  
Hisao Takahashi ◽  
Yasunobu Miyoshi
Keyword(s):  
General Circulation ◽  
Atomic Oxygen ◽  
Lower Thermosphere ◽  
Lower Boundary ◽  
Circulation Model ◽  
Vertical Transport ◽  
Transport Processes ◽  
Planetary Waves ◽  
Emission Rates ◽  
Middle Latitudes

Abstract. The planetary-wave-induced airglow variability in the mesosphere and lower thermosphere (MLT) is investigated using simulations with the general circulation model (GCM) of Kyushu University. The model capabilities enable us to simulate the MLT OI557.7 nm, O2b(0–1), and OH(6–2) emissions. The simulations were performed for the lower-boundary meteorological conditions of 2005. The spectral analysis reveals that at middle latitudes, oscillations of the emission rates with the period of 2–20 days appear throughout the year. The 2-day oscillations are prominent in the summer and the 5-, 10-, and 16-day oscillations dominate from the autumn to spring equinoxes. The maximal amplitude of the variations induced by the planetary waves was 34 % in OI557.7 nm, 17 % in O2b(0–1), and 8 % in OH(6–2). The results were compared to those observed in the middle latitudes. The GCM simulations also enabled us to investigate vertical transport processes and their effects on the emission layers. The vertical transport of atomic oxygen exhibits similar periodic variations to those observed in the emission layers induced by the planetary waves. The results also show that the vertical advection of atomic oxygen due to the wave motion is an important factor in the signatures of the planetary waves in the emission rates.

The rate constant for the reaction O(3P)+D2 at low temperatures

1989 ◽  
Vol 90 (1) ◽  
pp. 183-188 ◽  
Author(s):  
Yi‐Fei Zhu ◽  
Sivaram Arepalli ◽  
Robert J. Gordon
Keyword(s):  
Rate Constant ◽  
Low Temperatures

Measurement of a structured profile of atomic oxygen in the mesosphere and lower thermosphere

1980 ◽  
Vol 85 (A3) ◽  
pp. 1291-1296 ◽  
Author(s):  
L.C. Howlett ◽  
K.D. Baker ◽  
L.R. Megill ◽  
A.W. Shaw ◽  
W.R. Pendleton ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Lower Thermosphere ◽  
Mesosphere And Lower Thermosphere
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