Solar soft X-rays and solar activity

Soft solar X-rays (8 ⩽ gl ⩽ 12 Å) were observed from OSO-III. An analysis of the X-ray enhancements associated with 165 solar flares revealed that there is a tendency for a weak soft X-ray enhancement to precede the cm- λ burst and H α flare. The peak soft X-ray flux follows the cm- λ peak by about 4 min, on the average. Additionally, it was found that flare-rich active centers tend to produce flares which are stronger X-ray and cm- λ emitters than are flares which take place in flare-poor active centers.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43754/1/11207_2004_Article_BF00155382.pd