Solar U- and J- radio bursts at the decameter waves

Details Solar U- and J- radio bursts at the decameter waves Solar U- and J- radio bursts at the decameter waves

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1206..433d&link_type=abstract

ASTROPHYSICS AND COSMOLOGY AFTER GAMOW: Proceedings of the 4th Gamow International Conference on Astrophysics and Cosmology Afte

Physics

High Energy Physics

1

Radio Telescopes, Solar Corona, Solar Radio Emission, Radio Telescopes And Instrumentation, Heterodyne Receivers, Corona, Solar Electromagnetic Emission

Scientific paper

The results of the first observations of solar U- and J- bursts with the radiotelescope UTR-2 at the decameter wavelengths are reported. During 2003-2004 more than 50 J- bursts and only 7 U- bursts were registered. It is the first case of ground based observations of J- and U- bursts with turning frequencies below 25 MHz. For the first time the harmonic structure of J- bursts in the form of Jb-J pairs was found. The mean harmonic ratio appeared to be 1.8. Also a group of J-bursts with unusual Turning Frequency Drift (TFD) of -2 kHz/s was detected. Such TFD corresponds to the velocity of coronal loop elevation of about 60 km/s. Coronal loops with similar elevation velocities were also detected by SOHO-LASCO coronagraph in white light. The dynamic spectra of unusual U- and J- bursts are shown. Simplified model of the coronal loop in the form of semicircle was created on the base of the U- burst dynamic spectrum and the Newkirk coronal density model. With this loop model the linear velocity of the source along the loop, the height of the Turning Frequency point and the geometrical size of the loop were calculated.

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