@Article{BatistaAbdu:1977:MaStAs,
               author = "Batista, Inez Staciarini and Abdu, Mangalathayil Ali",
                title = "Magnetic storm associated delayed sporadic e enhancements in the 
                         brazilian geomagnetic anomaly",
              journal = "Journal of Geophysical Research",
                 year = "1977",
               volume = "82",
               number = "29",
                pages = "4777--4783",
                month = "Oct.",
             keywords = "AERONOMIA, tempestades magn{\'e}ticas, atraso, Regi{\~a}o E, 
                         magnetic anmalies, magnetic storms, delay, E region, magnetic 
                         disturbances.",
             abstract = "Sporadic E layer behavior over Cachoeira Paulista (11 degree 57'S, 
                         22 degree 32'E geomagnetic coordinates), located near the center 
                         of the Brazilian Geomagnetic Anomaly., is investigated during 
                         magnetically disturbed periods. Significant enhancements in the Es 
                         layer parameters, ftEs and fbEs take place for short periods (2-3 
                         hours)following a magnetic disturbance of moderate intensity. The 
                         enhancements, however, are delayed by 1-3 days with respect to the 
                         initiation of a disturbance. The electron density enhancement in 
                         the Es layer inferred from fbEs during such events are at times an 
                         order of magnitude larger than undisturbed values. Also, during 
                         some night events the ambient E region electron densities appear 
                         comparable to the regular daytime maximum values. The Es traces in 
                         the ionograms during these events exhibit range spread in the 
                         echoes resembling the a-type Es, know to occur over auroral 
                         latitudes under disturbed conditions. These results are 
                         interpreted as evidence of enhanced charged particle precipitation 
                         in the E region over the geomagnetic anomaly following magnetic 
                         disturbances. The results also provide evidence that the E region 
                         response over our station is delayed with respect to magnetic 
                         activity.",
           copyholder = "SID/SCD",
                 issn = "0148-0227 and 2156-2202",
                label = "1752",
             language = "en",
           targetfile = "INPE-984.pdf",
        urlaccessdate = "29 jun. 2024"
}