Structural changes in the tidal components in mesospheric winds as observed by the MF radar during afternoon counter electrojet events |
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| Institution: | 1. Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Krishnapuram, Tirunelveli 627 011, India;2. Indian Institute of Geomagnetism, Colaba, Mumbai 400 005, India;1. National Institute of Meteorology and Hydrology, Bulgarian Academy of Sciences, 67 Tsarigradsko shose Blvd., 1784 Sofia, Bulgaria;2. Faculty of Physics, Sofia University “St. Kliment Ohridski”, 5 James Bourchier Blvd., 1164 Sofia, Bulgaria;3. Bulatsa, Sofia, 1 Brussels Blvd., 1540 Sofia, Bulgaria;4. National Institute of Geophysics, Geodesy and Geography, Acad. G. Bonchev Str., bl. 3, 1113 Sofia, Bulgaria;1. Physics Department, Colorado State University, Fort Collins, USA;2. Center of Atmospheric and Space Sciences, Utah State University, Logan, USA;3. Department of Physics and Astronomy, Clemson University, Clemson, USA;1. Institute for Meteorology, Universität Leipzig, Stephanstr.3, 04103, Leipzig, Germany;2. Institute for Experimental Meteorology, Obninsk, Russia;1. Space and Earth Science Laboratory, Department of Physics, Shivaji University, Kolhapur, India;2. Medium Frequency Radar, Indian Institute of Geomagnetism, Shivaji University Campus, Kolhapur, India;1. Frederick Research Center, Nicosia, Cyprus;2. Department of Physics, University of Crete, Heraklion, Crete, Greece;3. Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada |
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| Abstract: | In this paper we examine the relationship between the tidal characteristics as observed by the MF radar at Tirunelveli (8.7°N, 77.8°E, geographic; 0.3°N magnetic dip) and the occurrence of afternoon counter electrojet (ACEJ) events. A reduction in the diurnal tide activity and/or an enhancement of semi-diurnal tide amplitude is observed on many of the ACEJ days. A clear anticorrelation is seen between the afternoon electrojet strength and the amplitude of the semi-diurnal tide in the solstitial months of June and July, 1995. The results presented herein provide observational support to the earlier numerical models that consider the interplay of various tidal modes in the evolution of equatorial ionospheric current system whose extreme manifestation in ground-geomagnetic field variations being the reversal of the electrojet in the afternoon hours. |
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