Table 1
Occurrence of soft X-ray flares during solar cycle 21, 22, and 23.
| Class | Cycle 21 | Cycle 22 | Cycle 23 | |||
|
|
||||||
| Counts | F ISXR | Counts | F ISXR | Counts | F ISXR | |
|
|
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| X | 148 (1.4%) | 33 870 (33.8%) | 144 (1.3%) | 31 130 (30.8%) | 107 (0.9%) | 27 820 (35.3%) |
| M | 1681 (15.6%) | 39 265 (39.1%) | 1673 (14.6%) | 40 591 (40.2%) | 1060 (8.8%) | 25 799 (32.7%) |
| C | 8033 (74.6%) | 26 670 (26.6%) | 7821 (68.0%) | 28 177 (28%) | 7259 (59.9%) | 23 395 (29.7%) |
| B | 900 (8.4%) | 464 (0.5%) | 1857 (16.1%) | 1036 (1%) | 3674 (30.4%) | 1776 (2.3%) |
Notes. The events of soft X-ray flares over the solar cycle are characterized by their counts as well as soft X-ray flare index (FISXR). The value in brackets denotes the contribution of the corresponding parameter out of its total value over that particular solar cycle. The FISXR has been rounded up to the nearest integer.
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