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- Title
Latitude variability of acoustic-gravity waves in the upper atmosphere based on satellite data.
- Authors
Fedorenko, A.; Bespalova, A.; Zhuk, I.; Kryuchkov, E.
- Abstract
Based on satellite measurements, we investigated the properties of acoustic-gravity waves in different geographical areas of the Earth's upper atmosphere. To study wave activity at high latitudes, we used the concentration of neutral particles measured by the low-altitude polar satellite Dynamic Explorer 2 and measurements from the equatorial satellite Atmosphere Explorer-E for analysis of waves at low latitudes. In the range of heights 250-400 km, there are observed latitudinal variations of amplitudes, together with variations in the morphological and spectral properties of acoustic-gravity waves. In the polar regions of thermosphere, the wave amplitudes amount to 3-10% in terms of relative variations of density and do not exceed 3% at low and middle latitudes. At low latitudes, regular fluctuations induced by the solar terminator are clearly seen with a predominant wave mode moving synchronously with terminator. Moreover, at low and middle latitudes, there are observed sporadic local wave packets of small amplitudes (1-2%) that can have origins of various natures. We also investigated the relation between some of the observed wave trains and the earthquakes.
- Subjects
GRAVITY waves; SOUND waves; UPPER atmosphere; THERMOSPHERE; EQUATORIAL satellites
- Publication
Geomagnetism & Aeronomy, 2017, Vol 57, Issue 4, p471
- ISSN
0016-7932
- Publication type
Article
- DOI
10.1134/S0016793217030057