Results 21 to 30 of about 5,343,913 (293)

First Observational Evidence for the Role of Polar Vortex Strength in Modulating the Activity of Planetary Waves in the MLT Region [PDF]

Geophysical Research Letters, 2022
Based on the meteor winds measured at Mohe (MH; 53.5°N, 122.3°E) and the reanalysis data, we investigate the variations of planetary waves in the mesosphere and lower thermosphere (MLT) region during the 2019/2020 Arctic winter.
Zheng Ma, Yun Gong, Shaodong Zhang, Qihou Zhou, Chunming Huang, Kaiming Huang, Guozhu Li   +6 more
openalex   +2 more sources

New Findings Relating Tidal Variability and Solar Activity in the Low Latitude MLT Region

Journal of Geophysical Research: Space Physics, 2022
Mesospheric winds have been measured by meteor radar at Cachoeira Paulista (22.7°S; 45°W) since April 1999. The tidal components were analyzed over about 21 years of available data exhibiting an annual and semi‐annual variation.
V. Andrioli, J. Xu, P. Batista, L. Resende, Da Silva, A. L., J. P. Marchezi, H. Li, C. Wang, Z. Liu, A. Guharay   +10 more
semanticscholar   +2 more sources

NN‐MLT Model Prediction for Low‐Latitude Region Based on Artificial Neural Network and Long‐Term SABER Observations [PDF]

Earth and Space Science, 2023
The low‐latitude mesosphere and lower thermosphere (MLT) regions are distinct and, highly turbulent transition zones in Earth's atmosphere. The scarcity of reliable measurements makes continuous monitoring of these areas challenging.
Chalachew Lingerew, U. Jaya Prakash Raju, Celso Augusto Guimarães Santos   +2 more
doaj   +2 more sources

Atomic oxygen retrievals in the MLT region from SCIAMACHY nightglow limb measurements [PDF]

Atmospheric Measurement Techniques, 2014
. Vertical distributions of atomic oxygen concentration ([O]) in the mesosphere and lower thermosphere (MLT) region were retrieved from sun-synchronous SCIAMACHY/Envisat (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY on board the ...
O. Lednyts'kyy, C. Savigny, K. Eichmann, M. Mlynczak   +3 more
semanticscholar   +4 more sources

Vertical propagation characteristics and seasonal variability of tidal wind oscillations in the MLT region over Trivandrum (8.5° N, 77° E): first results from SKiYMET Meteor Radar [PDF]

, 2006
. Tidal activity in the Mesospheric Lower Thermosphere (MLT) region over Trivandrum (8.5° N, 77° E) is investigated using the observations from newly installed SKiYMET Meteor Radar.
V. Deepa, G. Ramkumar, Maria Antonita, Karanam Kishore Kumar, M. N. Sasi   +4 more
openalex   +2 more sources

Simulations of large winds and wind shears induced by gravity wave breaking in the mesosphere and lower thermosphere (MLT) region [PDF]

, 2014
. Using a fully nonlinear two-dimensional (2-D) numerical model, we simulated gravity waves (GWs) breaking and their contributions to the formation of large winds and wind shears in the mesosphere and lower thermosphere (MLT).
Xiaodong Liu, Jiyao Xu, Hanli Liu, Jia Yue, Wei Yuan   +4 more
openalex   +2 more sources

Trends in MLT region winds and planetary waves, Collm (52° N, 15° E) [PDF]

Annales Geophysicae, 2008
Abstract. Long-period oscillations in the period range 2–30 days, interpreted as planetary wave (PW) signatures, have been analysed using daily mesosphere/lower thermosphere wind measurements near 90 km over Collm (52° N, 15° E) in the time interval 1980–2005. Interannual and interdecadal variability of PW are found.
Christoph Jacobi, Peter Hoffmann, D. Kürschner   +2 more
openalex   +3 more sources

Study of the Tidal Variations in the Ionosphere and the MLT Region over Mohe and Beijing During Six Intense Geomagnetic Storms from 2016 to 2021 [PDF]

Remote Sensing
Geomagnetic storms can cause large variations in the ionosphere, but their impacts on the mesosphere and lower thermosphere (MLT) are not well understood. Based on the Total Electron Content (TEC) data and the meteor neutral winds data over Mohe (53.5°N,
Jiarong Ma, Zheng Ma, Jiaxin Bao, Jiahui Luo, Junfeng Yang, Dan Liu   +5 more
doaj   +2 more sources

Derivation of vertical wavelengths of gravity waves in the MLT-region from multispectral airglow observations [PDF]

Journal of Atmospheric and Solar-Terrestrial Physics, 2018
Abstract We present the derivation of gravity wave vertical wavelengths from OH airglow observations of different vibrational transitions. It utilizes small phase shifts regularly observed between the OH(3-1) and OH(4-2) intensities in the spectra of the GRIPS (GRound-based Infrared P-branch Spectrometer) instruments, which record the OH airglow ...
C. Schmidt, T. Dunker, S. Lichtenstern, J. Scheer, S. Wüst, U. Hoppe, M. Bittner   +6 more
semanticscholar   +4 more sources

3-4 day Kelvin waves observed in the MLT region at 7.4º S, Brazil

Geofísica Internacional, 2008
Mediciones de vientos obtenidas con un radar de meteoros operando en São João do Cariri-PB (7.4° S, 36.5° O), Brasil, durante el año 2005, se han usado para estudiar las características de las ondas ultra rápidas Kelvin en la región de la mesopausa y la termosfera inferior. Un análisis de los datos, por la técnica de transformadas de wavelet, revela la
Lourivaldo Mota Lima, E. De Oliveira Alves, A. F. Medeiros, R. A. Buriti, P. P. Batista, B. R. Clemesha, H. Takahashi   +6 more
openalex   +5 more sources