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- Title
A case study of mesospheric planetary waves observed over a three-radar network using empirical mode decomposition.
- Authors
Kishore, Pangaluru; Velicogna, Isabella; Sutterley, Tyler C.; Mohajerani, Yara; Ciracì, Enrico; Madhavi, Gummadipudi Nagasai
- Abstract
In this paper an attempt is made to study equatorial Kelvin waves using a network of three radars: Kototabang (0.204° S, 100.320° E) meteor radar, Pameungpeuk (7.646° S, 107.688° E) medium-frequency radar, and Pontianak (0.003° S, 109.367° E) medium-frequency radar. We have used the continuous data gathered from the three radars during April-May 2010. Empirical mode decomposition (EMD), Lomb-Scargle periodogram (LSP) analysis, and wavelet techniques are used to study the temporal and altitude structures of planetary waves. Here, we used a novel technique called EMD to extract the planetary waves from wind data. The planetary waves of ~6.5 and ~3.6 days periodicity are observed in all three radar stations with peak amplitudes of about 12 and 11ms-1, respectively. The 3.6- day wave has an average vertical wavelength from the three radars of about 42 km. The 3.6- and 6.5-day planetary waves are particularly strong in the zonal wind component. We find that the two waves are present at the 84-94 km height region. The observed features of the 3.6- and 6.5-day waves at the three tropical-latitude stations show some correspondence with the results reported for the equatorial-latitude stations.
- Subjects
MESOSPHERIC thermodynamics; ROSSBY waves; HILBERT-Huang transform; METEORITES; OCEAN waves
- Publication
Annales Geophysicae (ANGEO) (09927689), 2018, Vol 36, Issue 3, p925
- ISSN
0992-7689
- Publication type
Article
- DOI
10.5194/angeo-36-925-2018