Vertical coupling of atmospheres: dependence on strength of sudden stratospheric warming and solar activity

Show simple item record Laskar, Fazlul I. Pallamraju, Duggirala Veenadhari, Bhaskara 2014-08-22T17:14:20Z 2014-08-22T17:14:20Z 2014-08
dc.identifier.citation Laskar, Fazlul I.; Pallamraju, Duggirala and Veenadhari, Bhaskara, “Vertical coupling of atmospheres: dependence on strength of sudden stratospheric warming and solar activity”, Earth, Planets and Space, DOI: 10.1186/1880-5981-66-94, vol. 66, no. 1, Aug. 2014 en_US
dc.identifier.issn 1343-8832
dc.description.abstract Comprehensive behavior of the low-latitude upper atmosphere during sudden stratospheric warming (SSW) events at varying levels of solar activity has been investigated. The equatorial electrojet (EEJ) strength and the total electron content (TEC) data from low latitudes over Indian longitudes during the mid-winter season in the years 2005 to 2013 are used in this study. Five major and three minor SSW events occurred in the observation duration, wherein the solar activity had varied from minimum (almost no sunspots) to mini-maximum (approximately 50 sunspots of the solar cycle 24). Spectral powers of the large-scale planetary wave (PW) features in the EEJ and the TEC have been found to be varying with solar activity and SSW strengths. Specially, the spectral powers of quasi-16-day wave variations during the three very strong SSW events in the years 2006, 2009, and 2013 were found to be very high in comparison with those of other years. For these major events, the amplitudes of the semi-diurnal tides and quasi-16-day waves were found to be highly correlated and were maximum around the peak of SSW, suggesting a strong interaction between the two waves. However, this correlation was poor and the quasi-16-day spectral power was low for the minor events. A strong coupling of atmospheres was noted during a relatively high solar activity epoch of 2013 SSW, which was, however, explained to be due to the occurrence of a strong SSW event. These results suggest that the vertical coupling of atmospheres is stronger during strong major SSW events and these events play an important role in enabling the coupling even during high solar activity. en_US
dc.description.statementofresponsibility by Fazlul I. Laskar, Duggirala Pallamraju and Bhaskara Veenadhari
dc.format.extent vol. 66, no. 1
dc.language.iso en en_US
dc.publisher Terra Scientific Publishing Company en_US
dc.subject Atmospheric tides en_US
dc.subject Ionosphere en_US
dc.subject Planetary waves en_US
dc.subject Sudden stratospheric warming en_US
dc.subject Sun-Earth interaction en_US
dc.subject Therm osphere en_US
dc.subject Total electron content en_US
dc.subject Upper atmosphere en_US
dc.subject Vertical coupling en_US
dc.title Vertical coupling of atmospheres: dependence on strength of sudden stratospheric warming and solar activity en_US
dc.type Article en_US
dc.relation.journal Earth, Planets and Space

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