@Article{FernandesSawMelBenKan:2000:InAcRe,
               author = "Fernandes, Francisco Carlos Rocha and Sawant, Hanumant Shankar and 
                         Melendez, J. L. and Benz, A. O. and Kane, S. R.",
                title = "Investigations of the accelaration region of energetic electrons 
                         asociated with decimetry type III and X-ray bursts",
              journal = "Advances in Space Research",
                 year = "2000",
               volume = "25",
               number = "9",
                pages = "1813--1816",
             keywords = "GEOSTROF{\'{\I}}SICA, explos{\~o}es radio, flares solares, 
                         acelera{\c{c}}{\~a}o, cromosfera, radio x duro, fotosfera, 
                         accelaration, chromosphere, hard x ray, photosphere.",
             abstract = "Preliminary results of the association between type III decimetric 
                         bursts, mainly having center frequency above 1000 MHz and recorded 
                         by Phoenix radio spectrometer, and seven hard X-ray flares 
                         observed by the Yohkoh/HXT from September, 1992 to October, 1993 
                         are reported here. (a)For an assumed improved density model of the 
                         solar chromosphere, an average electron beam velocity (similar to 
                         0.16 c)and hence an average electron energy (similar to 7 keV)was 
                         inferred from the average frequency drift rate (similar to 1350 
                         MHz/s)of 160 isolated type III bursts. Assuming the electrons lose 
                         energy primarily by collisions, the height of injection of the 
                         energetic electrons was estimated (1.2 x 10(9)- 4.5 x 10(9)cm). 
                         (b)In two flares at the onset of the bursts, the correlation 
                         between X-rays and radio was better at lower frequencies (less 
                         than or equal to 500 MHz). However, during the time evolution of 
                         those flares, the correlation improved for higher and higher 
                         frequencies (greater than or equal to 800 MHz), suggesting that 
                         the acceleration region was displaced towards the photosphere. The 
                         estimated velocity of the acceleration region is similar to 3 x 
                         10(3)- 8 x 10(3)km/s. (c)In two flares, the enhancement of the 
                         radio decimetric emission above 500 MHz started earlier (similar 
                         to 10 s)than the X-ray emissions, suggesting in case of these two 
                         flares that the acceleration region is located near to where the 
                         decimetric emission is generated.",
                 issn = "0273-1177",
                label = "9421",
             language = "en",
           targetfile = "1-s2.0-S0273117799006171-main.pdf",
        urlaccessdate = "10 maio 2024"
}