| Date | Measured solar flux 2.8 GHz |
Sunspot number | Planetary A index | K indices (3-hour intervals) |
Solar wind speed range (km/s) (SOHO) |
Number of flares |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Magnetic (SDO) |
NOAA | STAR ap avg |
Pots- dam WDC |
Daily ap range |
Planetary (WDC) |
Boulder | C | M | X | ||||
| 2K | 1K | ||||||||||||
| 20170531 | 74.1 | 31 | 23 | 11 | 3.0 | 3 | 0-5 | 01001111 | 12102212 | 323-449 | 3 | ||
| 20170530 | 73.7 | 15 | 0 | 0 | 5.1 | 5 | 2-18 | 23110100 | 24222211 | 378-530 | |||
| 20170529 | 75.8 | 41 | 12 | 16 | 9.0 | 9 | 2-27 | 01124321 | 11224332 | 322-413 | |||
| 20170528 | 78.8 | 22 | 17 | 20 | 48.6 | 49 | 3-132 | 67654211 | 66653311 | 326-413 | 2 | ||
| 20170527 | 81.9 | 38 | 26 | 21 | 12.9 | 13 | 0-67 | 10001336 | 10011436 | 277-421 | |||
| 20170526 | 80.2 | 36 | 26 | 22 | 2.3 | 2 | 0-4 | 10010010 | 11022311 | 278-340 | |||
| 20170525 | 76.1 | 60 | 53 | 19 | 2.3 | 2 | 0-4 | 00001101 | 01112312 | 309-365 | |||
| 20170524 | 77.9 | 73 | 49 | 15 | 3.3 | 3 | 2-5 | 11111000 | 22211411 | 352-483 | |||
| 20170523 | 76.0 | 101 | 64 | 47 | 7.4 | 7 | 4-15 | 23112122 | 23212322 | 449-557 | |||
| 20170522 | 74.4 | 81 | 53 | 55 | 8.6 | 9 | 6-15 | 22222233 | 23133333 | 478-592 | |||
| 20170521 | 73.5 | 55 | 36 | 35 | 7.5 | 8 | 5-12 | 23222122 | 34322222 | 564-695 | |||
| 20170520 | 72.3 | 59 | 24 | 22 | 21.8 | 22 | 12-32 | 44444433 | 4444242* | 572-769 | |||
| 20170519 | 72.3 | 27 | 24 | 24 | 12.1 | 12 | 5-22 | 23212443 | 23323323 | 358-591 | |||
| 20170518 | 72.2 | 42 | 37 | 24 | 9.3 | 9 | 2-22 | 43310112 | 43432312 | 348-462 | |||
| 20170517 | 71.4 | 31 | 25 | 13 | 6.6 | 7 | 5-9 | 22222122 | 12332322 | 445-534 | |||
| 20170516 | 71.9 | 35 | 11 | 23 | 7.3 | 7 | 4-12 | 32223111 | 33222322 | 530-606 | |||
| 20170515 | 70.6 | 25 | 22 | 0 | 11.5 | 12 | 2-22 | 02242433 | 12342433 | 339-610 | |||
| 20170514 | 71.2 | 23 | 11 | 0 | 8.3 | 8 | 5-15 | 21133222 | 22243323 | 272-352 | |||
| 20170513 | 70.4 | 0 | 0 | 0 | 3.6 | 4 | 2-5 | 01111111 | 13111222 | 272-350 | |||
| 20170512 | 68.9 | 22 | 11 | 0 | 7.3 | 7 | 4-15 | 21223121 | 21223212 | 344-439 | |||
| 20170511 | 69.1 | 36 | 12 | 0 | 5.4 | 5 | 3-12 | 13211112 | 23312122 | 344-369 | |||
| 20170510 | 68.6 | 12 | 11 | 0 | 5.0 | 5 | 0-12 | 21003112 | 22012313 | 344-394 | |||
| 20170509 | 68.9 | 0 | 0 | 0 | 4.9 | 5 | 3-7 | 11112211 | 21222211 | 344-426 | |||
| 20170508 | 70.5 | 23 | 11 | 11 | 4.8 | 5 | 3-7 | 21211111 | 31322322 | 339-438 | |||
| 20170507 | 71.7 | 22 | 22 | 23 | 8.3 | 8 | 4-15 | 13211132 | 22312322 | 332-356 | |||
| 20170506 | 72.8 | 26 | 24 | 26 | 4.1 | 4 | 2-6 | 12111011 | 12112421 | 317-361 | |||
| 20170505 | 73.5 | 39 | 32 | 31 | 3.9 | 4 | 0-12 | 32011000 | 32112211 | 344-456 | |||
| 20170504 | 74.2 | 52 | 32 | 29 | 5.3 | 5 | 0-18 | 01211013 | 12112124 | 340-381 | |||
| 20170503 | 74.9 | 23 | 17 | 15 | 3.0 | 3 | 0-5 | 11011100 | 10122310 | 329-453 | |||
| 20170502 | 77.2 | 50 | 31 | 25 | 3.5 | 4 | 0-7 | 12010002 | 13121111 | 378-455 | |||
| 20170501 | 75.3 | 44 | 28 | 11 | 4.4 | 4 | 0-9 | 22000112 | 23111212 | 347-439 | |||
| Average | 73.6 | 36.9 | 24.0 | 17.4 | 8.09 | 8.10 | |||||||
| International sunspot number (SILSO-WDC): 18.8 | |||||||||||||
| K factor | 0.51 | 0.78 | 1.08 | ||||||||||
This page is normally updated once a day by Jan Alvestad. Solar wind speed is preliminary. Ap and Kp values in red are based on the definitive Potsdam WDC data. Flare enhanced and erroneous solar flux measurements are replaced by other same day measurements (QC).