Evolution and Radio Activity of a Flare Productive Active Region NOAA7321

Details Evolution and Radio Activity of a Flare Productive Active Region NOAA7321 Evolution and Radio Activity of a Flare Productive Active Region NOAA7321

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994kofu.symp..151n&link_type=abstract

In: Proceedings of Kofu Symposium, Kofu, Japan, Sept. 6-10, 1993, p.151-155.

Computer Science

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Scientific paper

By the Nobeyama Radioheliograph, evolution of radio features in flare productive active region NOAA7321 was observed. Delay of emergence of radio feature was detected comparing with soft X-ray feature observed by Yohkoh, which implied that coronal region above NOAA7321 had weak magnetic field strength and high temperature at initial phase of evolution. During evolution of this region, many radio bursts are observed by the radioheliograph and the radio polarimeters at Nobeyama and Toyokawa. These bursts showed radio spectra with high turnover frequency and steep lower frequency cutoff. Negative bursts were observed during entire observation period of NOAA7321. These results suggest that the radio bursts in NOAA7321 were caused by continuous appearance of strong magnetic field regions to lower corona.

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