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First results of convectively generated long-period Kelvin waves in the low-latitude mesosphere during Indian summer monsoon
Authors:GJ Bhagavathiammal  S Sathishkumar  S Sridharan  Manohar Lal  S Gurubaran  KU Nair
Institution:1. Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Krishnapuram, Maharajanagar, Tirunelveli 627011, India;2. National Atmospheric Research Laboratory, Gadanki 517 112, Chittoor District, Andhra Pradesh, India;1. Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Trivandrum 695022, India;2. Instituto Nacional de Pesquisas Espaciais, C.P. 515, São José dos Campos, SP, Brazil;1. Department of Physics & Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5005, USA;2. Department of Biology & Biochemistry, University of Houston, Houston, TX 77204-5001, USA;1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany;2. Institute of Quantum Physics, Albert-Einstein Allee-11, Ulm University, 89069 Ulm, Germany;3. Center for Integrated Quantum Science and Technology, Albert-Einstein-Allee 11, Ulm University, 89069 Ulm, Germany;4. Institute for Theoretical Physics, Albert-Einstein-Allee 11, Ulm University, 89069 Ulm, Germany;5. Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Givat Ram, Israel;6. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA;7. Department of Physics, University of Massachusetts Boston, Boston, MA 02125, USA;1. Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Geographical Institute “Jovan Cviji?” Serbian Academy of Sciences and Arts, Djure Jak?i?a 9, 11000 Belgrade, Serbia;3. Perm National Research Polytechnic University, Perm, Russian Federation;4. Department of Astronomy, Faculty of Mathematics, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia;5. Department of Telecommunications and Information Science, Military Academy, University of Defence, Generala Pavla Juri?i?a ?turma 33, 11000 Belgrade, Serbia;6. Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
Abstract:Spectral analysis of Tirunelveli (8.7°N, 77.8°E) MF radar winds for the year 2007 indicate the presence of long-period Kelvin waves with periods ~23 and ~16 days in the low-latitude mesosphere during Indian summer monsoon months. The dominant presence of these slow-phase speed waves at mesospheric altitudes motivated us to investigate their origin and vertical propagation characteristics. Space-time Fourier analysis of NCEP winds and OLR show the presence of these periodicities with zonal wavenumber 1 indicating that tropical convection is the potential source for these waves and westward phase of stratospheric QBO winds might have favoured these waves to reach the mesosphere.
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