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
20250831 217.0 192.0 195.7 366 256 188 6.3 6 5-9 22122221 22122322 10121212 380-498* 18    
20250830 219.4 232.1 236.6 396 246 183 6.3 6 4-7 11222222 12223423 20122431 344-425* 24 5  
20250829 221.7 235.7 240.4 422 310 195 5.6 6 3-7 22112122 22114312 21011253 358-432* 37 1  
20250828 231.6 256.4 261.6 405 260 201 6.0 6 5-7 21212222 21323422 21112123 372-458 37 4  
20250827 225.7 200.4 204.6 367 272 227 6.5 7 3-12 11123222 21114322 32133344 332-415 24    
20250826 202.3 173.7 177.4 362 267 193 6.6 7 4-12 23221112 23233412 24332214 312-420 39 5  
20250825 174.9 157.5 160.9 323 240 136 7.1 7 2-15 12013322 11013321 11114333 344-476 25 5  
20250824 151.5     260 186 102 4.8 5 3-6 22111121 22112322 32011212 356-450 30 1  
20250823 142.5     196 128 87 4.9 5 3-7 22121111 23122321 53211123 396-497 24 1  
20250822 126.5     129 75 51 7.4 7 3-15 32112223 32102323 53111345 472-566 6 1  
20250821 121.0     178 116 76 6.5 6 3-12 32111222 23112322 55101445 450-587 7    
20250820 119.7     205 131 59 12.5 12 5-27 43321223 43332323 54423355 560-694 10    
20250819 116.0     157 110 36 19.1 19 7-39 32224454 42345544 33134355 368-744 4 1  
20250818 113.8     169 94 73 6.0 6 0-15 00122312 11132413 00123332 297-387 1    
20250817 117.4     207 114 53 3.8 4 0-6 11212100 11312311 42222210 311-377 14    
20250816 122.1     219 150 123 4.4 4 2-6 01111212 12122422 12122334 342-401 9    
20250815 122.8     259 178 168 6.1 6 5-9 22211121 33432321 44333351 371-473 20    
20250814 130.4     330 227 170 9.5 10 5-18 32332112 33543322 54533244 440-527 12    
20250813 140.0     343 234 157 12.5 12 7-18 23323332 23343333 55234345 462-659 27    
20250812 152.5     358 230 152 13.4 13 7-27 43223323 33234323 66324445 484-750 34 2  
20250811 145.7     270 194 157 16.8 17 9-32 42323423 44333323 55325544 470-573 43 4  
20250810 153.3     321 214 155 21.3 21 9-32 32443443 33363333 64455556 501-643 25 4  
20250809 139.7     243 168 137 42.9 43 18-67 55555643 54654523 66445554 442-620 27 2  
20250808 147.7     258 189 177 19.8 20 2-48 01135453 11234544 01125463 319-597 19 2  
20250807 151.6 157.7 162.1 308 230 150 3.1 3 2-4 11011001 22122211 11111013 322-381 28 3  
20250806 158.2 141.9 146.0 264 193 154 5.9 6 3-12 21111213 22111422 22121325 368-437 40 1  
20250805 156.6 136.1 140.1 287 188 120 9.0 9 3-15 32113232 33113422 54224335 400-487 37 2  
20250804 142.7 133.3 137.2 249 165 86 6.9 7 2-9 01222222 11222322 01233434 403-564 29 2  
20250803 146.3 139.2 143.3 254 148 118 8.9 9 4-27 21122342 22112332 21122342 373-547 30 1  
20250802 146.3 134.6 138.6 318 186 132 8.4 8 4-15 32112233 32113422 55112235 435-549 26    
20250801 145.6 146.4 150.8 303 213 129 11.1 11 5-18 23223133 23333333 44235245 435-553 30    
Average 154.9     281.5 190.7 133.7 9.97 9.90
International sunspot number (SILSO-WDC): 133.6
K factor       0.47 0.70 1.00  

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]