Results 111 to 120 of about 14,994 (266)

A fast SWIR imager for observations of transient features in OH airglow

, 2016
. Since December 2013 the new imaging system FAIM (Fast Airglow IMager) for the study of smaller-scale features (both in space and time) is in routine operation at the NDMC (Network for the Detection of Mesospheric Change) station at DLR (German ...
P. Hannawald, C. Schmidt, S. Wüst, M. Bittner, M. Bittner   +4 more
semanticscholar   +1 more source

High-resolution observations of small-scale gravity waves and turbulence features in the OH airglow layer

, 2016
. A new version of the Fast Airglow Imager (FAIM) for the detection of atmospheric waves in the OH airglow layer has been set up at the German Remote Sensing Data Center (DFD) of the German Aerospace Center (DLR) at Oberpfaffenhofen (48.09° N, 11.28° E),
René Sedlak, P. Hannawald, C. Schmidt, S. Wüst, M. Bittner   +4 more
semanticscholar   +1 more source

Electrodynamic influence on the diurnal behaviour of neutral daytime airglow emissions

, 2016
. The diurnal variations in daytime airglow emission intensity measurements at three wavelengths OI 777.4 nm, OI 630.0 nm, and OI 557.7 nm made from a low-latitude location, Hyderabad (17.5° N, 78.4° E; 8.9° N MLAT) in India have been investigated.
D. Karan, D. Pallamraju, K. Phadke, T. Vijayalakshmi, T. Pant, S. Mukherjee   +5 more
semanticscholar   +1 more source

Impact of lower atmospheric scattering on ground-based optical thermospheric wind observations with spatially uneven airglow [PDF]

Atmospheric Measurement Techniques
Scattered airglow emissions in the lower atmosphere can bias ground-based interferometer observations of thermospheric winds, particularly when airglow brightness becomes spatially uneven due to auroras. During two geomagnetic storms with visible auroras
X. Wei, X. Wei, X. Wei, G. Jiang, G. Jiang, G. Jiang, Y. Zhu, Y. Zhu, Y. Zhu, J. Xu, J. Xu, W. Liu, W. Liu, T. Wang, T. Wang, T. Wang, G. Zhu, G. Zhu, W. Yuan, W. Yuan   +19 more
doaj   +1 more source

A Dual-Channel Passive Limb Imaging System (DUALIS) for Mars with UV Airglow-Based CO₂ Retrieval and 557.7 nm Doppler Wind Imaging Interferometry

Remote Sensing
Characterizing both the CO2 distribution and wind dynamics in the Martian mesosphere and lower thermosphere is vital for planetary atmospheric science and mission planning. In this work, we propose a novel dual-channel passive limb-viewing imaging system
Yanqiang Wang, Shun Zhou, Tingyu Yan, Shiping Guo, Zeyu Chen, Yifan He, Yao Lu   +6 more
doaj   +1 more source

Nightside Detection of a Large‐Scale Thermospheric Wave Generated by a Solar Eclipse

Geophysical Research Letters, 2018
The generation of a large‐scale wave in the upper atmosphere caused by a solar eclipse was first predicted in the 1970s, but the experimental evidence remains sparse and comprises mostly indirect observations. This study presents observations of the wind
B. J. Harding, D. P. Drob, R. A. Buriti, J. J. Makela   +3 more
doaj   +1 more source

High-latitude artificial aurora using the EISCAT high-gain HF facility [PDF]

, 2002
The EISCAT high-frequency (HF) transmitter facility at Ramfjord, Norway, has been used to accelerate F-region electrons sufficiently to excite the oxygen atoms and nitrogen molecules, resulting in optical emissions at 630, 557.7 and 427.8 nm.
Hagfors, T., Holma, H., Honary, F., Isham, B., Jussila, J., Kaila, K., Kavanagh, A. J., Kosch, M. J., McCrea, I. W., Rietveld, M. T., Senior, A.   +10 more
core  

Resolving thermospheric vertical wind ambiguities and energy processes

Frontiers in Astronomy and Space Sciences
This study applies a generalized vertical coordinate system approach alongside thermodynamic control volume analysis to explore the nuanced interpretations of energy transfer processes associated with vertical motion in the thermosphere.
Jeffrey P. Thayer, Jeffrey P. Thayer, Austin Coleman   +2 more
doaj   +1 more source

Resolving the disk rotation of HD 97048 and HD 100546 in the [O I] 6300A line: evidence for a giant planet orbiting HD 100546

, 2005
Aims. We intend to spatially and spectrally resolve the [O I] emission region in two nearby Herbig stars. Methods. We present high-resolution (R = 80,000) VLT/UVES echelle spectra of the [O I] 6300A line in the Herbig Ae/Be stars HD 97048 and HD 100546.
Acke, Acke, Acke, Acke, Armitage, Artymowicz, Augereau, B. Acke, Boss, Bouwman, Chiang, Deleuil, Dominik, Dullemond, Eggleton, Grady, Grady, Hill, Leinert, Liu, M. E. van den Ancker, Malfait, McCarthy, Oppenheimer, Pantin, Quillen, van Boekel, van den Ancker, Wilner   +28 more
core   +1 more source

Spectroscopy of a mesospheric ghost reveals iron emissions. [PDF]

Nat Commun, 2023
Passas-Varo M, Van der Velde O, Gordillo-Vázquez FJ, Gómez-Martín JC, Sánchez J, Pérez-Invernón FJ, Sánchez-Ramírez R, García-Comas M, Montanyà J.   +8 more
europepmc   +1 more source