@InProceedings{FernandesMeléSawa:1998:AcReEn,
               author = "Fernandes, Francisco C. R. and Mel{\'e}ndez, Jorge L. and Sawant, 
                         Hanumant S.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Acceleration region of energectic particles associated with type 
                         III and x-ray bursts during solar flares",
            booktitle = "Proceedings...",
                 year = "1998",
                pages = "357--360",
         organization = "Encontro Brasileiro de F{\'{\i}}sica dos Plasmas, 5.",
             abstract = "We investigated the association between type III decimetric bursts 
                         mainly having center frequency above 1000 MHz, and hard x-ray 
                         flares, observed by Phoenix radio spectrometer and Yohkoh 
                         satellite, respectively. Assuming an improved density model of the 
                         solar chromosphere, the average electron beam velocity (~0.16c) 
                         and hence the average electron energy (~7 keV) was inferred from 
                         the average frequency drift rate (~1350 MHz/s) of the 160 isolated 
                         type III bursts. The height of acceleration region of the 
                         energetic electrons was estimated (1.2-4.5 x 10 9 cm), assuming 
                         the electrons lose energy primarily by collisions with 
                         chromospheric plasma. In majority of flares analysed, decimetric 
                         and X-ray emissions started almost simultaneously. However in two 
                         flares, radio emission started earlier (~5-10 sec.), suggesting 
                         that the acceleration region is located near to where the 
                         decimetric emission is generated, about 10 9 cm above the 
                         photosphere. In two flares, the correlation between x-rays and 
                         radio was better at lower frequencies (= < 100-600 MHz) at the 
                         onset of the bursts. However, during the evolution of those 
                         flares, the correlation improved for higher and higher frequencies 
                         (=> 600 MHz) suggesting that the acceleration region was displaced 
                         towards the photosphere. The estimated velocity of the 
                         acceleration region is ~3-8 x 10 3 km/s.",
  conference-location = "{\'A}guas de Lind{\'o}ia, SP",
      conference-year = "30 nov. - 04 dez.",
             language = "en",
           targetfile = "acceleratin region.pdf",
        urlaccessdate = "24 abr. 2024"
}