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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 1
Ann. Geophys., 33, 101–108, 2015
https://doi.org/10.5194/angeo-33-101-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Observation, analysis and modelling of solar and heliospheric...

Ann. Geophys., 33, 101–108, 2015
https://doi.org/10.5194/angeo-33-101-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 27 Jan 2015

Regular paper | 27 Jan 2015

A dominant acoustic-gravity mode in the polar thermosphere

A. K. Fedorenko, A. V. Bespalova, O. K. Cheremnykh, and E. I. Kryuchkov A. K. Fedorenko et al.
  • Space Research Institute of NAS Ukraine and SSA Ukraine, Prosp. Akad. Glushkova, 40, build. 4/1, 03680 MSP, Kyiv 187, Ukraine

Abstract. The article presents a summary of the main findings of the systematic study of acoustic-gravity waves (AGWs) in the polar thermosphere. This study was based on the in situ measurements made by the Dynamics Explorer 2 (DE2) spacecraft late in its mission when it descended low enough (250–400 km). It was found out that AGWs in the polar thermosphere are observed within a narrow frequency band close to the Brunt–Väisälä frequency and with horizontal wavelengths about 500–600 km. The broadband spectrum of travelling ionospheric disturbance (TID) frequencies observed by radars is caused by the Doppler effect. The AGW amplitudes do not depend on the altitude, but grow almost linearly with the wind velocity. They propagate towards the wind.

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The article presents a summary of the main findings of the systematic study of acoustic-gravity waves (AGWs) in the polar thermosphere. This study was based on the in situ measurements made by the Dynamics Explorer 2 spacecraft. It was found out that AGWs in the polar thermosphere are observed within a narrow frequency band and with horizontal wavelengths about 500-600km. The connection between the directions of motion of AGW and polar wind circulation was detected.
The article presents a summary of the main findings of the systematic study of acoustic-gravity...
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