Decimetric solar type U bursts - VLA and PHOENIX observations

Details Decimetric solar type U bursts - VLA and PHOENIX observations Decimetric solar type U bursts - VLA and PHOENIX observations

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..380a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 380-392.

Astronomy and Astrophysics

Astrophysics

39

Decimeter Waves, Solar Corona, Solar Magnetic Field, Solar Radio Bursts, Very Large Array (Vla), Electron Beams, Magnetic Field Configurations, Solar Flares, Solar Wind

Scientific paper

Observations of type U bursts, simultaneously detected by the VLA at 1.446 GHz and by the broadband spectrometer Phoenix in the 1.1-1.7 GHz frequency band on August 13, 1989 are reported. Extrapolations of the coronal magnetic field, assuming a potential configuration, indicate that the VLA 20 cm source demarcates an isodensity level. The source covers a wide angle of diverging magnetic field lines whose footpoints originate close to a magnetic intrusion of negative polarity into the main sunspot group of the active region with dominant positive polarity. The centroid of the 20-cm U-burst emission, which corresponds to the turnover frequency of the type U bursts and remains stationary during all U bursts, coincides with the apex of extrapolated potential field lines at a height of about 130,000 km. It is demonstrated that the combination of radio imaging and broadband dynamic spectra, combined with the magnetic field reconstruction from magnetograms, can constrain all physical parameters of a magnetic loop system.

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