The study of tides and gravity waves with the help of field-aligned velocities measured by EISCAT
Abstract
From fifteen 24 h records of v-parallel, measured by EISCAT, tidal motions of the neutral atmosphere have been deduced. The maximal amplitude of this motion was studied as a function of altitude for different times and seasons. The signatures of gravity waves have also clearly been identified in the same v-parallel records. Some parameters of the waves can be deduced. Finally, average power spectra of gravity waves in the frequency range 15 min to about 6 h have been computed. These power spectra show a distinctly different shape in summer and winter, indicating that long period gravity waves occur more frequently in summer. Possible explanations of this result are discussed.
- Publication:
-
Journal of Atmospheric and Terrestrial Physics
- Pub Date:
- October 1986
- DOI:
- 10.1016/0021-9169(86)90062-0
- Bibcode:
- 1986JATP...48..879S
- Keywords:
-
- Eiscat Radar System (Europe);
- Gravity Waves;
- Neutral Atmospheres;
- Tides;
- Annual Variations;
- Power Spectra;
- Time Series Analysis