author = "Rastogi, R. G. and Janardhan, P. and Chandra, H. and Trivedi, 
                         Nalin Babulal and Erick, Vidal",
          affiliation = "{Physical Research Laboratory} and {Physical Research Laboratory} 
                         and {Physical Research Laboratory} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Geofisico del Peru}",
                title = "Effect of solar flare on the equatorial electrojet in eastern 
                         Brazil region",
              journal = "Journal of Earth System Science",
                 year = "2017",
               volume = "126",
               number = "4",
                month = "June",
             keywords = "Solar flare, equatorial electrojet.",
             abstract = "The effect of solar flare, sudden commencement of magnetic storm 
                         and of the disturbances ring current on the equatorial electrojet 
                         in the Eastern Brazil region, where the ground magnetic 
                         declination is as large as 20 degrees W is studied based on 
                         geomagnetic data with one minute resolution from Bacabal during 
                         November-December 1990. It is shown that the mean diurnal vector 
                         of the horizontal field was aligned along 2 degrees E of north at 
                         Huancayo and 30 degrees W of north at Bacabal during the month of 
                         December 1990. Number of solar flares that occurred on 30 December 
                         1990 indicated the direction of solar flare related Delta H vector 
                         to be aligned along 5 degrees E of north at Huancayo and 28 
                         degrees W of north at Bacabal. This is expected as the solar flare 
                         effects are due to the enhanced conductivity in the ionosphere. 
                         The SC at 2230 UT on 26 November 1990 produced a positive impulse 
                         in Delta X and negative impulse in Delta Y at Bacabal with Delta H 
                         vector aligned along 27 degrees W of north. At Huancayo the Delta 
                         H vector associated with SC is aligned along 8 degrees E of north, 
                         few degrees east to the alignment of the diurnal vector of H. The 
                         magnetic storm that followed the SC had a minimum Dst index of 
                         -150 nT. The corresponding storm time disturbance in Delta X at 
                         Huancayo as well as at Bacabal were about -250 nT but Delta Y at 
                         Bacabal was about +70 nT and very small at Huancayo, that give the 
                         alignment of the H vector due to ring current about 16 degrees W 
                         of north at Bacabal and almost along N-S at Huancayo. Thus 
                         alignment of the Delta H vector due to ring current at Bacabal is 
                         14 degrees E of the mean direction of Delta H vector during 
                         December 1990. This is consistent with the direction of ring 
                         current dependent on the dipole declination at the ring current 
                         altitude which is about 5 degrees W of north over Bacabal and the 
                         deviation of declination due to the ring current during disturbed 
                         period given by the angle (psi-D).",
                  doi = "10.1007/s12040-017-0837-8",
                  url = "http://dx.doi.org/10.1007/s12040-017-0837-8",
                 issn = "0253-4126",
             language = "en",
           targetfile = "rastogi_effect.pdf",
        urlaccessdate = "05 dez. 2020"