Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l..49b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, March 20, 1991, p. L49-L52.
Astronomy and Astrophysics
Astrophysics
18
Solar Flares, Solar Radio Bursts, Polarized Radiation, Solar Magnetic Field, Solar X-Rays, Very Large Array (Vla)
Scientific paper
The Very Large Array was used for a period of about 80 minutes on September 11, 1989 to observe the sun at two frequencies in the 1.4 GHz band. In addition to a strong radio burst (700 sfu at maximum) of a duration of roughly 15 minutes, a multitude of small-amplitude, transient bursts occurred during the course of the observation. Specifically, some tens of microbursts occurred during a period of 65 minutes, ranging in amplitude from less than about 0.05 to 4 sfu, and ranging in duration from less than 10 to 40 s. A sample of these microbursts studied in detail shows that they occurred at five distinct locations in four different active regions. The microbursts are probably due to plasma radiation, although the microburst mechanism remains unknown. Their relation to known radio burst phenomena and hard X-ray microflares is unclear.
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