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) 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)		 2K 1K
20260430 143.3 308 183 130 13.5 14 3-39 21122345 21123334 31023455 354-546 29    
20260429 143.1 262 182 142 2.9 3 0-6 00111021 01112221 00012232 311-360 38    
20260428 149.4 228 149 144 2.0 2 0-5 01001110 11002211 00001010 335-428 57 3  
20260427 142.4 282 183 122 5.9 6 3-15 32111211 221222** 61122331 425-499 29 1  
20260426 156.3 264 166 137 11.3 11 4-18 23231133 23242233 44221126 410-549 46 5  
20260425 148.4 249 150 154 8.9 9 3-18 31111233 30112233 52111254 377-459 44 2  
20260424 146.3 267 185 123 8.4 8 4-18 21211233 21212222 31112265 385-470 42 5 2
20260423 127.9 156 120 71 6.1 6 4-12 23211111 22212322 34222213 414-509 36 6  
20260422 116.2 139 88 72 4.4 4 2-6 11022111 11022222 21123214 479-558 12    
20260421 112.3 142 87 68 19.8 20 6-39 54224432 44223332 66334554 503-597 20    
20260420 105.1 125 92 46 23.1 23 2-48 12433554 12443434 10334754 408-597 3    
20260419 104.5 108 75 35 20.6 21 5-56 34533321 35532212 54543444 470-560      
20260418 105.1 90 50 44 33.4 33 18-56 35554335 34644433 55643345 374-593 1    
20260417 107.1 97 49 50 3.1 3 0-12 00000023 00011222 00010125 309-378 2    
20260416 108.0 71 55 65 2.4 2 0-4 01100010 01111211 00001121 306-375 3    
20260415 104.8 130 67 57 4.1 4 2-7 11101211 01102311 10101334 341-410      
20260414 100.9 125 86 64 2.8 3 0-5 10011100 10112211 20002200 356-411      
20260413 98.7 109 56 58 3.0 3 2-4 01110111 11111311 11111102 398-500 1    
20260412 98.8 124 74 47 7.1 7 5-12 22223122 22333222 12223233 476-623 6    
20260411 93.3 110 83 42 11.8 12 4-22 24432221 15432212 23323243 508-638 2    
20260410 93.7 87 65 37 16.8 17 5-32 43214441 32324332 55225364 382-640      
20260409 96.7 96 58 79 5.8 6 3-9 11212222 10322322 31214443 366-418 4 1  
20260408 108.4 135 100 103 6.1 6 4-9 21122221 12121211 41133464 380-433 10    
20260407 108.9 160 113 110 7.6 8 2-15 32102213 32301212 51112355 389-505 9    
20260406 116.4 171 123 112 8.8 9 4-12 13222332 13222321 13224355 503-600 1    
20260405 118.0 201 131 112 12.0 12 3-22 43322311 32333311 55334432 510-638 16    
20260404 128.1 147 96 113 14.3 14 4-27 44321242 34331232 55321364 575-706 21 4  
20260403 135.8 177 110 118 45.8 46 22-94 44544656 33543654 45545677 612-856 44 2  
20260402 140.3 257 148 152 43.0 43 22-80 44555654 44565543 45545755 465-762 28 1  
20260401 141.9 234 146 130 8.5 8 4-15 32113212 31113422 54113332 389-578 20    
Average 120.0 168.4 109.0 91.2 12.10 12.10
International sunspot number (SILSO-WDC): 79.3
K factor   0.47 0.73 0.87  

2) Solar wind speed is preliminary (* on days with none 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]