Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..103..235c&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 103, no. 2, 1986, p. 235-247.
Astronomy and Astrophysics
Astronomy
20
Chromosphere, Type 3 Bursts, Doppler Effect, Radio Astronomy, Red Shift, Visible Spectrum
Scientific paper
The temporal association between the kinematic parameters of chromospheric dark features (DF) and the production of radio type-III bursts is investigated during a period of five months. It appears that 23 out of 24 bursts take place when the DF is totally or predominantly blue-shifted. In 18 out of 21 cases, a maximum of the outward velocity is observed in the optical image closest in time to the radio burst. The following peculiarities are also shown by the analyzed DF: (a) All of them present a lengthened shape, in most cases pointing toward a sunspot: a bright region coinciding with a parasitic polarity is observed in between. (b) Horizontal velocities along the DF major axis are often observed, always in a direction opposite to the sunspots. This association is interpreted by assuming that a shock wave, generated by the moving chromospheric material, is able to accelerate coronal electrons thus producing type-III bursts.
Chiuderi-Drago F.
Mein Nicole
Pick Monique
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