TEMPORAL CHARACTERISTICS OF SOLAR SOFT X-RAY AND HαFLARES

摘要

Temporal aspects of solar soft X-ray and Hαflares for the period 1997―2000 are investigated. For the considered time span about 8400 SXR and 11 400 Hαflares are reported in the SGD. Related flares observed in Ha as well as in SXR are identified amounting to about 2 100 events. Correlations among corresponding SXR and Ha events are analyzed and their relative timing is investigated. From the timing analysis we infer that for most of the events (84%) the start of the Ha emission is delayed with respect to the SXR emission. On average, the Hαflare starts 3 minutes after the SXR flare. The peaks occur preferentially simultaneously with a slight tendency that the Hαpeak precedes the SXR peak.