Results 261 to 270 of about 5,343,913 (293)

Comprehensive Study of the Climatology of the Quasi‐6‐Day Wave in the MLT Region Based on Aura/MLS Observations and SD‐WACCM‐X Simulations

Journal of Geophysical Research: Space Physics, 2020
The westward quasi‐6‐day wave (Q6DW) with zonal wavenumber 1 is a prominent and recurrent phenomenon in the mesosphere and lower thermosphere (MLT) and has a significant impact on day‐to‐day ionospheric variability.
Yusong Qin, Sheng‐yang Gu, Chen‐Ke‐Min Teng, X. Dou, Youjun Yu, Na Li   +5 more
semanticscholar   +1 more source

Gravity waves in the equatorial MLT region

Journal of Atmospheric and Solar-Terrestrial Physics, 2006
Abstract Observations of MF radar winds made at Christmas Island ( 2 ∘ N , 157 ∘ W ) between 1990 and 1997 are used to produce daily values of gravity wave variances in the equatorial mesosphere and lower thermosphere (70–100 km).
Kovalam, S., Vincent, R., Love, P.
openaire   +2 more sources

Ionospheric Hole in the MLT Regions after Submarine Volcanic Eruptions

2023
A gigantic submarine volcano erupted near Tonga Island on 15 January 2022 generating a tsunami and related atmospheric and oceanic waves across the globe. This violent volcano triggered extreme disturbances just above the volcanic center that reached near Earth’s stratosphere.
Sovit Khadka, Cesar Valladares, Andrew Gerrard   +2 more
openaire   +1 more source

Boundary layer polarization and voltage in the 14 MLT region

Journal of Geophysical Research: Space Physics, 1995
Viking midaltitude observations of ions and electrons in the postnoon auroral region show that field‐aligned acceleration of electrons and ions with energies up to a few kiloelectron volts takes place. The characteristics of the upgoing ion beams and the local transverse electric field observed by Viking indicate that parallel ion acceleration is ...
Lundin, R., Yamauchi, M., Woch, J., Marklund, G.   +3 more
openaire   +2 more sources

Long-term trends of MLT region winds over Central Europe

Physics and Chemistry of the Earth, Parts A/B/C, 2006
Abstract Radar measurements of mesosphere/lower thermosphere winds are carried out since several decades, now allowing the detection of long-term trends and to distinguish from long-period oscillations connected with the solar cycle or atmospheric decadal variability. Here we analyse Collm (52°N, 13°E) LF mean winds near 95 km.
Ch. Jacobi, D. Kürschner
openaire   +1 more source

Impact of a stratospheric warming event in January 2001 on the minor constituents in the MLT region calculated on the basis of a new 3D-model LIMA of the dynamics and chemistry of the middle atmosphere

Journal of Atmospheric and Solar-Terrestrial Physics, 2006
G. Sonnemann, M. Grygalashvyly, U. Berger   +2 more
semanticscholar   +3 more sources

Seasonal variation of planetary wave momentum flux and the forcing towards mean flow acceleration in the MLT region

Journal of Atmospheric and Solar-Terrestrial Physics, 2012
V. Babu, G. Ramkumar, S. R. John
semanticscholar   +3 more sources

New Aspects of the Airglow Problem and Reactivity of the Dioxygen Quintet O2(5Πg) State in the MLT Region as Predicted by DFT Calculations.

Journal of Physical Chemistry A, 2020
Dioxygen in the quintet O2(5Πg) state is a weakly bound species near the entrance of the O(3P) + O(3P) recombination channel. It was predicted by ab initio calculations in 1977 and detected experimentally in 1999.
B. Minaev, A. Panchenko
semanticscholar   +1 more source

Observation of 6.5-day waves in the MLT region over Wuhan

Journal of Atmospheric and Solar-Terrestrial Physics, 2008
Abstract In this paper, the 6.5-day planetary waves over Wuhan (30.5°N, 114.3°E) were investigated on the basis of the meteor radar measurements within 78–98 km height region during February 2002–December 2005. The observations show that 6.5-day waves have a prominent seasonal variability and have larger amplitudes at equinoxes than at solstices.
G. Jiang, J. Xiong, W. Wan, B. Ning, L. Liu   +4 more
openaire   +1 more source

Rotational effects in the field of tidal wind of the mid-latitude MLT-region

Advances in Space Research, 2003
Investigation of non-linear effects in the approach of quadratic coupling of tidal motions and planetary waves with taking into consideration their polarization properties was carried out. The investigation was based on the wind observations performed by meteor radar station of Kazan State University (Russia, Kazan, 56N, 49E) in the MLT-region (80 ...
Fahrutdinova A., Korotyshkin D., Fedorov D.   +2 more
openaire   +4 more sources