Results 181 to 190 of about 4,157,933 (216)

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
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Manifestations of minor and final stratospheric warmings in the MLT and F2-region

23rd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2017
We present the results of studying the state of the neutral upper atmosphere and the ionosphere over the Eastern Siberia region during minor winter sudden stratosphere warming (SSW) in early February, 2016 and final stratospheric warming in early March, 2016. We used the data from spectrometric measurements of OH (~87 km, 834.0 nm, (6-2)) and At O 2 (~
Irina V. Medvedeva, Konstantin Ratovsky
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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
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The role of EEP forcing and background dynamics on the seasonal NO variability in the MLT region

2020
<p><a name="docs-internal-guid-803d1a38-7fff-fefe-52f7-d0a055a4547b"></a><a name="docs-internal-guid-b8d76d48-7fff-149a-6440-413c0de833ae"></a> <span>Energetic electron precipitation (EEP) ionizes the Earth's atmosphere and leads to ...
Christine Smith-Johnsen, Hilde Nesse Tyssøy, Daniel Marsh, Anne Smith   +3 more
openaire   +1 more source

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

Modulation of the SE2 Tide in the MLT Region by the MJO Phenomenon

Journal of Geophysical Research: Space Physics
Abstract Based on Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics (TIMED)/Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature observations and the Real‐Time Multivariate Madden–Julian Oscillation (MJO) Index, this study provides the first analysis of the non‐migrating SE2 temperature tide at ...
Xing Li, Zhipeng Ren, Jinbin Cao
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Analyzing the MLT region with mass spectrometers

The mesosphere and lower thermosphere (MLT) region is a key transition zone between Earth’s lower and upper atmospheres, where energetic processes, wave dynamics, and chemical reactions converge. Understanding the temperature and chemical composition in this region is crucial for interpreting processes at higher altitudes. Despite the MLT&
Rico Fausch, Audrey Vorburger, Peter Wurz   +2 more
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Periodic auroral forms and geomagnetic field oscillations in the 1400 MLT region

Journal of Geophysical Research: Space Physics, 1990
The UV images obtained with the Viking satellite often show bright features which resemble “beads” or “pearls” aligned in the east–west direction between noon and 1800 MLT (Lui et al., 1989). Viking acquired a series of 25 UV images during a 28‐min period on July 29, 1986, which showed a distinctive series of periodic bright features in this region ...
T. A. Potemra, H. Vo, D. Venkatesan, L. L. Cogger, R. E. Erlandson, L. J. Zanetti, P. F. Bythrow, B. J. Anderson   +7 more
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Experimental Evidence for Solar Cycle and Long-Term Change in the Low-Latitude MLT Region

Journal of Atmospheric and Solar-Terrestrial Physics, 2005
Abstract There is a great deal of interest in long-term change in the upper atmosphere and its possible relationship with human activities, but it is clear that we do not yet have a consistent picture of solar cycle and long-term trends in the MLT region.
Paulo Batista, Hisao Takahashi, Dale Simonich   +2 more
exaly   +2 more sources

The role of energetic electron precipitation and background dynamics on the seasonal NO variability in the MLT region

2021
<p><span>Energetic electron precipitation (EEP) ionizes the Earth's atmosphere and leads to production of nitric oxide (NO) throughout the polar Mesosphere and Lower Thermosphere (MLT). In this study we investigate the direct and indirect NO response to the EEP using the Whole Atmosphere Community Climate Model (WACCM ...
Christine Smith-Johnsen, Hilde Nesse Tyssøy, Daniel Robert Marsh, Anne Smith, Ville Maliniemi   +4 more
openaire   +1 more source