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Showing 1 to 20 of 42 for “"airglow"”.
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Tsunami monitoring using airglow imaging systems
… content and for over 5 years in the 630.0 nm airglow. Here, we provide a comprehensive overview on the utilization of airglow imaging systems for monitoring tsunamis. We develop the basic theory behind tsunami-ionospheric coupling from first principles and give special attention to the topic …
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Relations between the airglow and the mesopheric circulation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1964.
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Extreme Ultraviolet Airglow Observations and Applications from the Ionospheric Connection Explorer
… in part by using observations of ultraviolet airglow, which have long been used as a tool for making remote sensing observations of the upper atmosphere. The Extreme Ultraviolet Spectrometer (EUV) instrument was included on ICON to measure atmospheric airglow between 54 and 88 nm in order to …
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Studies of Atmospheric Gravity Waves in the Mesopause Region Using Airglow Imaging
… potential of studying wave propagation through airglow layers using imaging systems, numerical simulations have been carried out to retrieve vertical structures from multisensor imaging measurements. Regularization techniques have been compared in the tomographic reconstruction processes of …
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Computing Two-Dimensional Unambiguous Horizontal Wave Number Spectra From OH Airglow Images
There is an inherent 180$\sp\circ$ ambiguity in the derived wave propagation direction when using conventional spectral analysis techniques on OH imager observations. A processing technique for computing the unambiguous two-dimensional (2-D) horizontal wave number spectrum from images of gravity …
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Estimation of the vertical wavelength of atmospheric gravity waves from airglow imagery
… propagate vertically, they spatially perturb the airglow emission layers in all three dimensions. Estimates of the vertical wavelength, horizontal wavelength, and the intrinsic frequency are needed to characterize an AGW and quantify its effects on upper atmospheric dynamics. The dispersion …
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A Full-Wave Investigation of the Use of a 'Cancellation Factor' in GW-Airglow Interaction Studies
… species involved in the chemical reactions of airglow emissions in the mesopause region of the earth's atmosphere. The so-called 'Cancellation Factor' (CF) is defined as a transfer function relating the amplitude of airglow brightness fluctuation to the amplitude of GW-induced fluctuation in …
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Estimation of Intrinsic Gravity Wave Parameters From Multiple, Ground-Based Observations of a Single Mesopheric Airglow Emission
… simultaneous observations of mesospheric airglow emissions to estimate key intrinsic parameters of atmospheric gravity waves (AGWs). As AGWs propagate through the mesosphere, they spatially and temporally perturb mesospheric airglow emissions, which, from the ground, can be imaged using …
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Radio and Optical Techniques for Locating Equatorial Plasma Irregularities
… equatorial regions using radio occultation and airglow imaging is presented. A similar technique is employed to study the relationship between Bragg-scale radar backscatter and depletions observed with the airglow imager. A climatology of airglow and radar data from the central Pacific that …
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Evaluating the Capability of ICON-MIGHTI to Detect Plasma Bubbles in the Ionosphere
The MIGHTI airglow imager onboard the ICON spacecraft in LEO was built to make remote thermospheric windspeed measurements at low latitudes. The MIGHTI team, when reviewing the data, observed variations in day-to-day brightness potentially indicative of plasma bubbles: regions of low-density …
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A night airglow study of the hydroxyl (OH) rotational-vibrational molecular spectra in the (8,3) sequence and its diurnal temperature and intensity variation.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Ionospheric imaging with compressed sensing
… from sensing to reconstruction. One example is airglow imaging, wherein we propose replacing CCD-based imagers with single-pixel, compressive imagers. This will reduce the cost of airglow imagers and allow access to spatial information at infrared wavelengths. We show preliminary simulation …
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Implementation and Analysis of 3-D Tomographic Reconstructions from Space-Based Imaging Platforms
… from the ground, from clouds, and from the OH-airglow layer. Depending on the desired object, these nuisance signals can significantly reduce image quality. The ground will have city lights, clouds will reflect light, and every material will have a different reflectance, some up to 60%. …
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An Observational Investigation on Gravity Wave Characteristics and Propagation in the Lower Stratosphere and Mesopause
… at South Pole and the mesopause region using OH airglow imager at Maui, Hawaii and Cerro Pachon, Chile. Wave characteristics at these regions are deduced and the seasonal variation of wave activity, wave sources, and propagation effect are studied. The study of gravity waves in the lower …
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Rocket Borne Measurements of a Near-Infrared Vehicle Induced Emission with a Newly Designed Spectrograph
… detector array measured the mesospheric hydroxyl airglow emissions during the initial ascent as well as the vehicle induced glow through the mesopause at eight discreet bandpasses. Data collected shows moderate agreement with previous measurements by Murtagh et al. [1997] and Lopez-Moreno et al. …
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Middle Atmosphere Structure and Dynamics: Lidar Studies and Gravity Wave Spectral Modeling
… and the existing DFT model predictions. Airglow and Na-layer parameter spectra are important because they can be used to characterize the small vertical wave number region of the wave spectrum, which is relatively unaffected by dissipation. The new DFT model is used to model the …
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A Quasiclassical Trajectory Study Of Impulsive Collisions Between Hydroxyl (nu = 1--9, K = 1,2,5,10) And Molecular Oxygen In The Upper Mesophere
Observations of the hydroxyl airglow are widely used as a remote sensing tool in the study of middle atmosphere dynamics. To assess the validity of this technique, a comprehensive understanding of the excitation and emission processes is required. The effect of collisional quenching of …
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Dynamical Processes of Gravity Waves Propagation and Dissipation, and Statistical Characteristics of Their Momentum Flux in the Mesosphere and Lower Thermosphere
… studies are based on the data acquired from an airglow imager and a sodium lidar, with the assistance of some simulation data from a meso-scale numerical model and GCMs.</p> <p>To understand the dynamical processes in gravity wave propagation and dissipation, a gravity wave should be resolved as …
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Investigation of Mountain Waves in the Mesosphere over the Andes Mountains
… to analyze data from a NIR All-Sky Imager of OH airglow emission (from about 87 km altitude), located in the Andes, with the purpose of investigating the atmospheric gravity waves generated when low level wind blows over the high mountains (referred to as Mountain Waves). These types of waves are …
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3D Simulator for Wind Interferometer Data-Model Comparison
… Doppler shifts from a suite of visible region airglow and measures zonal and meridian winds, temperature, and VER (Volume Emission rate) in the upper mesosphere and lower thermosphere (80 to 300 km) from observations of the Earth's airglow. We will use a similar approach discussed for MIGHTI to …
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