Tomographic imaging of airglow from airborne spectroscopic measurements

Anderson, David S.; Swenson, G. R.; Kamalabadi, F.; Liu, Alan

doi:10.1364/ao.47.002510

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…Airglow imagery is frequently used to obtain key parameters of the gravity waves in the mesosphere-lower-thermosphere (MLT) to define their characteristics and to better understand how they transfer momentum and generate turbulence at these altitudes [25]. One of these parameters is the intrinsic phase speed of the wave (i.e., speed relative to the background wind field at that altitude).…”

Section: Discussionmentioning

confidence: 99%

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Three-dimensional tomographic reconstruction of mesospheric airglow structures using two-station ground-based image measurements

et al. 2012

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A new methodology is presented to create two-dimensional (2D) and three-dimensional (3D) tomographic reconstructions of mesospheric airglow layer structure using two-station all-sky image measurements. A fanning technique is presented that produces a series of cross-sectional 2D reconstructions, which are combined to create a 3D mapping of the airglow volume. The imaging configuration is discussed and the inherent challenges of using limited-angle data in tomographic reconstructions have been analyzed using artificially generated imaging objects. An iterative reconstruction method, the partially constrained algebraic reconstruction technique (PCART), was used in conjunction with a priori information of the airglow emission profile to constrain the height of the imaged region, thereby reducing the indeterminacy of the inverse problem. Synthetic projection data were acquired from the imaging objects and the forward problem to validate the tomographic method and to demonstrate the ability of this technique to accurately reconstruct information using only two ground-based sites. Reconstructions of the OH airglow layer were created using data recorded by all-sky CCD cameras located at Bear Lake Observatory, Utah, and at Star Valley, Wyoming, with an optimal site separation of ∼100 km. The ability to extend powerful 2D and 3D tomographic methods to two-station ground-based measurements offers obvious practical advantages for new measurement programs. The importance and applications of mesospheric tomographic reconstructions in airglow studies, as well as the need for future measurements and continued development of techniques of this type, are discussed.

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Section: Discussionmentioning

confidence: 99%

“…Recently, a virtual chain was created by collecting a sequence of all-sky OH images for 2D tomographic imaging using a single camera on an airplane [25]. However, the motion of the aircraft combined with the integration time of the imagers limited the resolution of the data to 8 km for an assumed stationary gravity wave.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional tomographic reconstruction of mesospheric airglow structures using two-station ground-based image measurements

et al. 2012

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“…Concerning GW, there are only five larger campaigns reported during which such measurements were performed to our knowledge -three between 1993 and 1999 and two between 2014 and 2016. Anderson et al (2008) used an aircraft-mounted spectroscopic imager to tomographically reconstruct atmospheric gravity waves, i.e. to estimate the horizontal-vertical airglow structure.…”

Section: Airborne Measurementsmentioning

confidence: 99%

Hydroxyl airglow observations for investigating atmospheric dynamics: results and challenges

et al. 2023

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Abstract. Measurements of hydroxyl (OH*) airglow intensity are a straightforward and cost-efficient method which allows the derivation of information about the climate and dynamics of the upper mesosphere/lower thermosphere (UMLT) on different spatiotemporal scales during darkness. Today, instrument components can be bought “off-the-shelf” and developments in detector technology allows operation without cooling, or at least without liquid nitrogen cooling, which is difficult to automate. This makes instruments compact and suitable for automated operation. Here, we briefly summarize why an OH* airglow layer exists, how atmospheric dynamics influence it and how temperature can be derived from OH* airglow measurements. Then, we provide an overview of the scientific results regarding atmospheric dynamics (mainly gravity waves (GWs) but also planetary waves (PWs) and infrasound) achieved with OH* airglow measurements. We focus on long-term ground-based OH* airglow measurements or airglow measurements using a network of ground-based instruments. The paper includes further results from global or near-global satellite-based OH* airglow measurements, which are of special importance for characterizing the OH* airglow layer. Additionally, the results from the very few available airborne case studies using OH* airglow instruments are summarized. Scientific and technical challenges for the next few years are described.

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“…Concerning GW, there are only five larger campaigns reported during which such measurements were performed to our knowledge; three between 1993 and 1999 and two between 2014 and 2016. Anderson et al (2008) used an aircraft-mounted spectroscopic imager to tomographically reconstruct atmospheric gravity waves, i.e., to estimate the horizontal-vertical airglow structure. The authors illustrate the applicability of their algorithm based on data taken during the ALOHA campaign, which took place in October 1993.…”

Section: Airborne Measurementsmentioning

confidence: 99%

Hydroxyl airglow observations for investigating atmospheric dynamics: results and challenges

Wüst

Bittner²,

Espy³

et al. 2022

Preprint

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Abstract. Measurements of hydroxyl (OH*) airglow intensity are a straightforward and cost-efficient method which allows information to be derived about the climate and dynamics of the upper mesosphere / lower thermosphere (UMLT) on different spatiotemporal scales during darkness. Today, instrument components can be bought “off-the-shelf” and developments in detector technology allows operation without cooling or at least without liquid nitrogen cooling, which is difficult to automate. This makes instruments compact and suitable for automated operation. Here, we provide an overview of the scientific results regarding atmospheric dynamics and relying on long-term ground-based OH*-airglow measurements or airglow measurements using a network of ground-based instruments. It includes further results from global or nearly-global satellite-based OH*-airglow measurements. Additionally, the results from the very few available airborne case studies using OH*-airglow instruments are summarised. Scientific and technical challenges for the next few years are described.

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Tomographic imaging of airglow from airborne spectroscopic measurements

Cited by 7 publications

References 30 publications

Three-dimensional tomographic reconstruction of mesospheric airglow structures using two-station ground-based image measurements

Three-dimensional tomographic reconstruction of mesospheric airglow structures using two-station ground-based image measurements

Hydroxyl airglow observations for investigating atmospheric dynamics: results and challenges

Hydroxyl airglow observations for investigating atmospheric dynamics: results and challenges

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