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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 3 | Copyright
Ann. Geophys., 36, 925-936, 2018
https://doi.org/10.5194/angeo-36-925-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 21 Jun 2018

Regular paper | 21 Jun 2018

A case study of mesospheric planetary waves observed over a three-radar network using empirical mode decomposition

Pangaluru Kishore1, Isabella Velicogna1,2, Tyler C. Sutterley1, Yara Mohajerani1, Enrico Ciracì1, and Gummadipudi Nagasai Madhavi3,4 Pangaluru Kishore et al.
  • 1Department of Earth System Science, University of California, Irvine, California 92697, USA
  • 2Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 3Department of Physics, Sri Venkateswara University, Tirupati, India
  • 4Vignana Bharathi Institute of Technology, Hyderabad, India

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 42km. 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 84–94km 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.

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