Observations of preburst heating and magnetic field changes in a coronal loop at 20 CM wavelength

Details Observations of preburst heating and magnetic field changes in a coronal loop at 20 CM wavelength Observations of preburst heating and magnetic field changes in a coronal loop at 20 CM wavelength

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92..189w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 189-198.

Physics

13

Centimeter Waves, Coronal Loops, Plasma Heating, Solar Magnetic Field, Solar Radio Bursts, Astronomical Maps, Circular Polarization, H Alpha Line, Time Response, Very Large Array (Vla)

Scientific paper

The Very Large Array (VLA) has been used at 20 cm wavelength to study the evolution of a burst loop with 4-arcsec resolution on timescales as short as 10 s. The VLA observations show that the coronal loop began to heat up and change its structure about 15 min before the eruption of two impulsive bursts. The first of these bursts occurred near the top of the loop that underwent preburst heating, while the second burst probably occurred along the legs of an adjacent loop. These observations evoke flare models in which coronal loops twist, develop magnetic instabilities, and then erupt. The VLA observations are also combined with GOES X-ray data to derive a peak electron temperature of 2.5 x 10 to the 7th K and an average electron density of about 10 to the 10th per cu cm in the coronal loop during the preburst heating phase.

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