Solar and geomagnetic data

Date Solar flux density
2.8 GHz		 Sunspot number Planetary A index
(3)		 K indices
(3-hour intervals) (3)		 Solar wind
speed range
(km/s)
(SOHO)(2)		 Number
of flares
DRAO (4) Almaty (1)
(daily avg)		 STAR
(SDO) (6)		 NOAA
(5)		 STAR
ap avg		 Pots-
dam
WDC		 Daily
ap range		 Planetary
(WDC)		 Boulder
(5)		 Andenes
(Tromsų)		 C M X
Measured
(20h UT)		 (02-11 UT) 2K 1K
  1AU
20250930 187.1 187.9 188.5 364 240 171 74.0 74 48-132 57656665 46656545 47655766 411-706 29 3  
20250929 186.4 176.8 177.5 347 240 170 27.6 28 9-56 22354553 23344442 43344555 373-432 48 6  
20250928 170.5 161.4 162.1 420 270 131 9.4 9 3-15 33022322 23112422 43112444 376-469 41 1  
20250927 163.5     361 223 160 4.6 5 3-9 11111122 11112223 11011044 377-431 35 3  
20250926 165.1 155.6 156.4 329 203 137 5.4 5 3-9 22121121 32113221 43111144 399-495 29 1  
20250925 170.4 162.2 163.2 292 221 149 6.0 6 3-9 11122222 11222322 11022224 436-569 32    
20250924 177.2     303 178 157 6.4 6 4-9 21122212 21123322 32123224 495-631 38 2  
20250923 171.3     328 230 172 14.4 14 6-22 33334332 32224332 53334443 507-658 14 1  
20250922 172.4 172.0 173.3 363 261 152 13.3 13 7-18 22233333 32223433 31133354 328-594 12    
20250921 176.0 176.2 177.7 364 244 157 4.5 4 2-6 11202211 12203222 11112223 291-354 19    
20250920 166.4     346 233 155 3.9 4 2-6 11211101 12312211 11211103 331-408 19    
20250919 159.9     378 242 158 1.5 2 0-4 00001000 01012111 20011121 390-516 19 1  
20250918 150.4     309 192 119 6.0 6 3-9 22222211 13232221 23133332 493-619 27    
20250917 147.2 163.8 165.5 232 165 119 9.5 10 5-15 23332122 22332222 33333255 542-802 20    
20250916 134.9     254 168 130 17.4 17 9-32 44433233 54433322 64434355 651-801 18    
20250915 129.9 151.2 152.9 185 142 94 47.9 48 22-111 76555444 56644433 65544446 593-783 23    
20250914 122.1 138.9 140.6 193 133 75 11.0 11 6-39 22222235 22332234 32112237 339-713 26    
20250913 117.6     148 132 43 5.4 5 2-12 12321101 13332111 33221233 356-436 7    
20250912 114.1 136.7 138.4 113 80 67 6.4 6 2-12 02232221 03342211 13323243 383-444 2    
20250911 115.2 135.2 137.0 140 116 92 7.8 8 4-18 32211212 33322212 44423225 387-514 17    
20250910 119.0 139.9 141.8 166 127 94 10.9 11 3-27 44122211 44112322 56123244 448-592 3    
20250909 121.7 141.9 143.9 231 144 99 16.6 17 7-56 32323235 32332324 44223256 462-591 2    
20250908 124.6 140.9 143.0 272 198 93 12.9 13 5-22 34223331 34234332 55333363 463-671 9    
20250907 132.5 154.8 157.2 223 147 83 2.4 2 0-7 00000022 11012212 10001155 492-669 31    
20250906 146.4 159.9 162.5 184 105 108 24.5 24 5-48 34444541 34434441 44544643 490-666 26 1  
20250905 149.0 176.7 179.6 238 154 128 6.5 6 2-15 20121133 10133323 40122345 366-488 14 1  
20250904 172.0 183.8 187.0 277 204 150 8.5 8 3-15 11232223 21334322 10124454 419-535 32 1  
20250903 179.6 189.8 193.1 269 185 128 11.0 11 2-32 43222120 33221221 54222241 446-621 25    
20250902 187.4 196.4 200.0 261 165 175 31.4 31 15-56 54433454 34433443 65433454 516-664 19    
20250901 201.9 200.9 204.6 341 223 165 13.8 14 4-67 11111236 21112324 21011356 369-676* 25    
Average 154.4 163.8 165.7 274.4 185.5 127.7 14.02 13.93
International sunspot number (SILSO-WDC): 129.8
K factor       0.47 0.70 1.02  

1) Calculated based on data obtained courtesy of the Institute of Ionosphere, Kazakhstan
 2) Solar wind speed is preliminary (* on days with no or too few measurements from SOHO-CELIAS/MTOF PM, measurements from DSCOVR or ACE are used)
3) Ap and Kp values in red are based on the definitive Potsdam WDC data.
4) Flare enhanced measurements and measurements that most likely are invalid are replaced by other same day measurements ## (daily QC). Solar flux measurements that may be invalid are temporarily marked **, while interpolated values are marked # .
5) Suspected faulty measurement or incomplete observation.
6) Sunspot count temporarily using other data sources than SDO.

This page is normally updated once a day by Jan Alvestad.

[Solar Terrestrial Activity Report]