Table 1
Number of shock crossings on both STEREO spacecraft divided according to the different shock sources (from left to right) and associated 65−75 keV electron increases.
| ICME | SIR | SIR/ | Other | All | |
| ICME | |||||
|
|
|||||
| Total number | 209 | 193 | 23 | 50 | 475 (100%) |
| Background | 16 | 61 | 4 | 9 | 90 (19%) |
| No increase | 174 | 126 | 15 | 40 | 355 (75%) |
| Contamination | 14 | 5 | 2 | 1 | 22 (5%) |
| Solar event | 1 | 1 | 1 | 0 | 3 (1%) |
| Shock event | 4 | 0 | 1 | 0 | 5 (1%) |
Notes. From top to bottom, the numbers represent all shock crossings, no increase above quiet-time background, no increase above a 4h pre-event background, an increase that is due to ion contamination, an increase due to a solar event, and a real shock-associated increase.
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