@Article{ChakrabartyFeGuPaAbSe:2014:PrAsFl,
               author = "Chakrabarty, D. and Fejer, B. G. and Gurubaran, S. and Pant, Tarun 
                         K. and Abdu, Mangalathayil Ali and Sekar, R.",
          affiliation = "Physical Research LaboratoryAhmedabad, India and Center for 
                         Atmospheric and Space Sciences, Utah State UniversityLogan, UT, 
                         United States and Indian Institute of GeomagnetismNavi Mumbai, 
                         India and Space Physics Laboratory, Vikram Sarabhai Space 
                         CentreTrivandrum, India and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and Physical Research LaboratoryAhmedabad, 
                         India",
                title = "On the pre-midnight ascent of F-layer in the June solstice during 
                         the deep solar minimum in 2008 over the Indian sector",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2014",
               volume = "121",
               number = "PB",
                pages = "177--187",
             keywords = "E region, Electric fields, F region, Geomagnetism, Ionosphere, 
                         Solar radiation, Diurnal tides, Equatorial ionosphere, Forecasting 
                         system, Geomagnetic conditions, Solar activity, Tidal winds, Wind 
                         measurement, Zonal electric fields, Solar energy.",
             abstract = "Investigations on the variations of the virtual height (h'F) of 
                         the base of the F-layer over Thumba (8.5°N, 77°E, dip lat 0.5°N) 
                         in 2002 (high solar activity) and 2008 (very low solar activity) 
                         under quiet geomagnetic conditions show characteristic 
                         pre-midnight rise of h. '. F in the June solstice of 2008. 
                         Comparison of the h. '. F variations in 2008 over Thumba and 
                         Fortaleza (3.9°S, 38.4°W, dip lat 1.8°S), Brazil, reveals that the 
                         pre-midnight rise of h'F is significantly more over Thumba during 
                         the June solstice. Drift measurements on-board the 
                         Communication/Navigation Outage Forecasting System (C/NOFS) 
                         satellite elicit that the midnight upward drift over the Indian 
                         sector during the northern summer months of 2009 is the largest, a 
                         feature that significantly weakens in 2010. C/NOFS measurements 
                         also confirm the electro-dynamical nature of the pre-midnight h. 
                         '. F rise over the Indian sector in the June solstice during the 
                         low solar activity. As the equatorial F-region vertical drifts 
                         during nighttime are controlled by E-region dynamo driven by tidal 
                         wind system, systematic wind measurements at upper mesospheric 
                         heights by an MF radar (1.98. MHz) from Tirunelveli (8.7°N, 
                         77.8°E, dip lat 0.5°S), India, during 2000-2011 are used to derive 
                         the tidal components. This reveals that the phases of both the 
                         meridional and zonal components of the diurnal tide regress while 
                         the phase of the meridional component of the semidiurnal tide 
                         significantly advances with decreasing solar activity with 
                         concomitant increases in amplitudes during the summer months. 
                         These observations suggest the possible semidiurnal tidal 
                         influence on the pre-midnight h'F rise over the Indian sector in 
                         the June solstice during low solar activity.",
                  doi = "10.1016/j.jastp.2014.01.002",
                  url = "http://dx.doi.org/10.1016/j.jastp.2014.01.002",
                 issn = "1364-6826",
                label = "scopus 2015-01 ChakrabartyFeGuPaAbSe:2014:PrAsFl",
             language = "en",
        urlaccessdate = "27 abr. 2024"
}