Open Access
Table 4.
Typical parameter values for type II bursts and CMEs in solar cycles 23 and 24.
| Parameter | All type II |
Type II with CMEs |
Type II without CMEs |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Cycle 23 | Cycle 24 | Total | Cycle 23 | Cycle 24 | Total | Cycle 23 | Cycle 24 | Total | |
| Type II duration (min) | |||||||||
| Mean | 10.4 | 10.7 | 10.5 | 10.7 | 10.8 | 10.7 | 7.5 | 8.4 | 8.2 |
| Median | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | 6.0 | 6.0 | 6.0 |
| Std. dev. | 6.8 | 9.7 | 7.9 | 8.1 | 6.6 | 10.1 | 6.4 | 6.9 | 4.4 |
| Type II drift rate (MHz s−1) | |||||||||
| Mean | 0.08 | 0.09 | 0.08 | 0.10 | 0.11 | 0.11 | 0.08 | 0.08 | 0.08 |
| Median | 0.05 | 0.06 | 0.06 | 0.05 | 0.06 | 0.06 | 0.05 | 0.06 | 0.06 |
| Std. dev | 0.03 | 0.02 | 0.03 | 0.03 | 0.02 | 0.03 | 0.03 | 0.02 | 0.03 |
| Type II speed (km s−1) | |||||||||
| Mean | 700 | 840 | 751 | 645 | 848 | 729 | 632 | 621 | 626 |
| Median | 538 | 671 | 592 | 490 | 671 | 563 | 475 | 456 | 461 |
| Std. dev | 568 | 716 | 630 | 773 | 945 | 815 | 773 | 848 | 811 |
| Type II height (R⊙) | |||||||||
| Mean | 1.77 | 1.76 | 1.77 | 1.78 | 1.77 | 1.78 | 1.77 | 1.83 | 1.74 |
| Median | 1.71 | 1.62 | 1.69 | 1.73 | 1.64 | 1.69 | 1.69 | 1.85 | 1.67 |
| Std. dev. | 0.27 | 0.29 | 0.28 | 0.26 | 0.29 | 0.28 | 0.27 | 0.27 | 0.28 |
| CME width (deg) | |||||||||
| Mean | – | – | – | 160 | 173 | 165 | – | – | – |
| Median | – | – | – | 110 | 125 | 115 | – | – | – |
| Std. dev. | – | – | – | 126 | 122 | 123 | – | – | – |
| CME speed (km s−1) | |||||||||
| Mean | – | – | – | 768 | 670 | 728 | – | – | – |
| Median | – | – | – | 584 | 499 | 546 | – | – | – |
| Std. dev. | – | – | – | 489 | 546 | 526 | – | – | – |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.