Effect of geomagnetic storms on the daytime low-latitude thermospheric wave dynamics

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dc.contributor.author Karan, Deepak K.
dc.contributor.author Pallamraju, Duggirala
dc.date.accessioned 2018-02-26T04:53:40Z
dc.date.available 2018-02-26T04:53:40Z
dc.date.issued 2018-02
dc.identifier.citation Karan, Deepak K. and Pallamraju, Duggirala, “Effect of geomagnetic storms on the daytime low-latitude thermospheric wave dynamics”, Journal of Atmospheric and Solar-Terrestrial Physics, DOI: 10.1016/j.jastp.2018.02.003, Feb. 2018. en_US
dc.identifier.issn 1364-6826
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/3484
dc.identifier.uri http://dx.doi.org/10.1016/j.jastp.2018.02.003
dc.description.abstract The equatorial- and low-latitude thermospheric dynamics is affected by both equatorial electrodynamics and neutral wave dynamics, the relative variation of which is dependent on the prevalent background conditions, which in turn has a seasonal dependence. Depending on the ambient thermospheric conditions, varying effects of the geomagnetic disturbances on the equatorial- and low-latitude thermosphere are observed. To investigate the effect of these disturbances on the equatorial- and low-latitude neutral wave dynamics, daytime airglow emission intensities at OI 557.7 nm, OI 630.0 nm, and OI 777.4 nm are used. These emissions from over a large field-of-view (FOV∼1000) have been obtained using a high resolution slit spectrograph, MISE (Multiwavelength Imaging Spectrograph using Echelle grating), from a low-latitude location, Hyderabad (17.50N, 78.40E; 8.90N MLAT), in India. Variations of the dayglow emission intensities are investigated during three geomagnetic disturbance events that occurred in different seasons. It is seen that the neutral dayglow emission intensities at all the three wavelengths showed different type of variations with the disturbance storm time (Dst) index in different seasons. Even though the dayglow emission intensities over low-latitude regions are sensitive to the variation in the equatorial electric fields, during periods of geomagnetic disturbances, especially in solstices, these are dependent on thermospheric O/N2 values. This shows the dominance of neutral dynamics over electrodynamics in the low-latitude upper atmosphere during geomagnetic disturbances. Further, spectral analyses have been carried out to obtain the zonal scale sizes in the gravity wave regime and their diurnal distributions are compared for geomagnetic quiet and disturbed days. Broadly, the zonal scales seem to be breaking into various scale sizes on days of geomagnetic disturbances when compared to those on quiet days. This contrast in the diurnal distribution of the zonal scale sizes brings to light, for the first time, the varying nature of the neutral wave coupling in the daytime thermosphere during periods of geomagnetic disturbances. en_US
dc.description.statementofresponsibility Deepak K. Karana and Duggirala Pallamrajua
dc.format.extent vol.170, pp.35-47
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject OI 557.7 nm en_US
dc.subject 630.0 nm en_US
dc.subject 777.4 nm en_US
dc.subject dayglow en_US
dc.subject Low-latitude thermosphere en_US
dc.subject Thermospheric gravity waves en_US
dc.subject Geomagnetic storm en_US
dc.title Effect of geomagnetic storms on the daytime low-latitude thermospheric wave dynamics en_US
dc.type Article en_US
dc.relation.journal Journal of Atmospheric and Solar-Terrestrial Physics


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