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Hard X-ray and high-frequency decimetric radio observations of the 4 April 2002 solar flare by S.R. Kane; H.S. Sawant; J.R. Cecatto; M.C. Andrade; F.C.R. Fernandes; M. Karlicky; H. Meszarosova is a Physics and Astronomy article available to read on EtoBox.

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Hard X-ray and high frequency decimetric type III radio bursts have been observed in association with the soft Xray solar flare (GOES class M 6.1) on 4 April 2002 (-1532 UT). The flare apparently occurred -6 degrees behind the east limb of the Sun in the active region NOAA 9898. Hard X-ray spectra and images were obtained by the Xray imager on RHESSI during the impulsive phase of the flare. The Brazilian Solar Spectroscope and Ondrejov Radio Telescopes recorded type III bursts in 800-1400 MHz range in association with the flare. The images of the 3-6, 6-12, 12-25, and 25-50 keV X-ray sources, obtained simultaneously by RHESSI during the early impulsive phase of the flare, show that all the four X-ray sources were essentially at the same location well above the limb of the Sun. During the early impulsive phase, the X-ray spectrum over 8-30 keV range was consistent with a power law with a negative exponent of -6. The radio spectra show drifting radio structures with emission in a relatively narrow (Af 5 200 MHz) frequency range indicating injection of energetic electrons into a plasmoid which is slowly drifting upwards in the corona.

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Author

S.R. Kane; H.S. Sawant; J.R. Cecatto; M.C. Andrade; F.C.R. Fernandes; M. Karlicky; H. Meszarosova

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0273-1177)

Published

2003

Language

EN

Field

Physics and Astronomy (Physical Sciences)