Solar and geomagnetic data

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
20170521 73.5 55 36 35 8.0 8 4-12 33222122 34322222 564-695      
20170520 72.3 59 24 22 21.9 22 15-27 44444433 4444242* 572-769      
20170519 72.3 27 24 24 10.1 10 4-18 22212333 23323323 358-591      
20170518 72.2 42 37 24 8.8 9 2-18 33310112 43432312 348-462      
20170517 71.4 31 25 13 6.6 7 4-9 22222112 12332322 445-534      
20170516 71.9 35 11 23 7.0 7 3-12 22323112 33222322 530-606      
20170515 70.6 25 22 0 9.8 10 2-18 02232233 12342433 339-610      
20170514 71.2 23 11 0 7.5 8 5-12 21132222 22243323 272-352      
20170513 70.4 0 0 0 3.4 3 2-5 01011111 13111222 272-350      
20170512 68.9 22 11 0 6.1 6 4-9 21222111 21223212 344-439      
20170511 69.1 36 12 0 5.5 6 3-12 13211112 23312122 344-369      
20170510 68.6 12 11 0 4.9 5 0-9 21002112 22012313 344-394      
20170509 68.9 0 0 0 4.6 5 3-6 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 6.6 7 3-12 12211132 22312322 332-356      
20170506 72.8 26 24 26 4.0 4 2-6 12111011 12112421 317-361      
20170505 73.5 39 32 31 4.0 4 0-15 31001000 32112211 344-456      
20170504 74.2 52 32 29 5.8 6 2-22 01101014 12112124 340-381      
20170503 74.9 23 17 15 2.9 3 2-4 10011100 10122310 329-453      
20170502 77.2 50 31 25 3.8 4 2-7 12110002 13121111 378-455      
20170501 75.3 44 28 11 3.8 4 0-9 22000012 23111212 347-439      
20170430 77.4 25 23 33 4.9 5 3-7 11111222 21121222 342-405      
20170429 77.0 44 36 34 5.4 5 4-7 21211122 22222322 344-405      
20170428 78.0 55 47 35 5.0 5 3-9 11211112 12212312 349-444      
20170427 78.2 72 39 23 6.0 6 3-9 22211121 13411222 379-524      
20170426 79.6 78 41 36 8.0 8 5-12 31212222 22422322 451-568      
20170425 81.3 50 41 36 9.8 10 7-15 33223222 33332332 463-666      
20170424 80.2 59 41 41 18.8 19 7-27 34342343 45452333 570-800      
20170423 82.5 91 52 43 36.0 36 27-56 44545544 45554433 658-834      
20170422 83.6 66 29 29 47.0 47 22-67 56555545 66565434 593-782      

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).

[Solar Terrestrial Activity Report]