• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/121/06/1511-1525

    • Keywords

       

      Tidal and gravity wave; airglow emission; mesosphere and lower thermosphere (MLT); planetary waves.

    • Abstract

       

      Simultaneous photometric measurements of the OI 557.7 nm and OH (7, 2) band from a low latitude station, Kolhapur (16.8°N, 74.2°E) during the period 2004–2007 are analyzed to study the dominant waves present in the 80–100 km altitude region of the atmosphere. The nocturnal intensity variations of different airglow emissions are observed using scanning temperature controlled filter photometers. Waves having period lying between 2 and 12 hours have been recorded. Some of these waves having subharmonic tidal oscillation periods 4, 6, 8 and 12 hours propagate upward with velocity lying in the range 1.6–11.3 m/s and the vertical wave length lying between 28.6 and 163 kms. The other waves may be the upward propagating gravity waves or waves resulting from the interaction of inter-mode tidal oscillations, interaction of tidal waves with planetary waves and gravity waves. Some times, the second harmonic wave has higher vertical velocity than the corresponding fundamental wave. Application of these waves in studying the thermal structure of the region is discussed.

    • Author Affiliations

       

      R N Ghodpage1 Devendraa Siingh2 R P Singh3 G K Mukherjee1 P Vohat4 A K Singh5

      1. Medium Frequency Radar, Indian Institute of Geomagnetism, Shivaji University Campus, Kolhapur 416 004, India.
      2. Indian Institute of Tropical Meteorology, Pune 411 008, India.
      3. Department of Physics, Banaras Hindu University, Varanasi 221 005, India.
      4. Geophysical Services, Makarpura Road, ONGC, Vadodara 390 009, India.
      5. Department of Physics, University of Lucknow, Lucknow 226 007, India.
    • Dates

       
  • Journal of Earth System Science | News

© 2017-2019 Indian Academy of Sciences, Bengaluru.