Solar and geomagnetic data

Date Measured
solar flux
Sunspot number Planetary A index K indices
(3-hour intervals)
Solar wind
speed range
(km/s)
(SOHO)
Number
of flares
STAR SDO NOAA STAR
ap avg
WDC Daily
ap range
Planetary
(WDC)
Boulder C M X
2K 1K
20120430 114.1 171 110 104 2.0 2 0-3 01110001 01111201 291-354 6    
20120429 116.0 213 141 114 4.1 4 2-9 22111010 22111210 348-436 5    
20120428 121.1 150 115 118 5.6 6 3-9 11121222 10121212 409-512 7    
20120427 117.9 195 146 99 7.5 8 3-15 32212122 32212223 444-646 6 1  
20120426 119.2 173 131 117 15.5 16 5-39 45223132 65322222 548-751 2    
20120425 127.2 168 126 137 27.4 27 15-56 43443454 44442343 521-781 3    
20120424 133.6 256 170 169 41.0 41 7-111 76523345 65622335 346-719 6    
20120423 141.8 217 149 158 26.4 26 4-67 24312456 15522544 324-413 3    
20120422 147.9 244 167 118 8.3 8 3-18 33232111 32231212 308-356 7    
20120421 149.1 283 187 147 7.6 8 2-22 10010234 21101232 285-380 4    
20120420 141.7 290 178 162 7.8 8 3-18 13321111 13322311 299-364 6    
20120419 137.8 229 138 122 5.0 5 2-12 11000033 11002222 335-423 6    
20120418 121.5 261 145 96 8.4 8 4-18 33312111 33212222 393-455 7    
20120417 113.8 238 131 78 8.8 9 2-18 10222232 10323332 289-408 1    
20120416 107.9 163 72 86 3.9 4 2-6 11001121 22012222 313-450 1 1  
20120415 101.7 150 92 77 4.8 5 4-7 12111121 02221221 428-534 2    
20120414 98.1 174 105 65 9.8 10 3-22 34212221 33022221 471-586      
20120413 97.7 127 78 50 20.1 20 6-48 55432323 45442222 530-687      
20120412 95.3 112 83 50 15.3 15 3-39 14222354 13322343 297-626      
20120411 93.4 104 68 28 4.5 4 2-7 11211002 11321112 283-353      
20120410 93.3 87 58 24 6.8 7 4-18 32111112 33212213 294-354      
20120409 94.5 51 34 24 3.1 3 0-7 11000022 12112222 288-340 2    
20120408 93.3 53 25 25 4.3 4 2-9 21111110 11122211 324-369      
20120407 95.7 55 38 38 9.8 10 2-18 33232102 24344212 310-353 1    
20120406 97.4 66 35 39 2.5 2 0-7 11000002 11111202 302-360      
20120405 100.9 128 89 39 16.3 16 6-27 33443322 33453312 281-366 3    
20120404 102.1 117 79 60 6.6 7 2-14 22001223 22011223 275-341 1    
20120403 103.5 118 74 62 4.8 5 2-7 22101122 22201212 276-342      
20120402 105.9 147 83 67 8.9 9 5-18 33212222 33212322 279-354      
20120401 107.3 131 90 50 5.8 6 4-7 12121222 12222211 309-357      
Average 113.0 162.4 104.6 84.1 10.09 10.10              
International sunspot number: 55.2
K factor   0.34 0.53 0.66                  

This page is normally updated once a day by Jan Alvestad. Solar wind speed is preliminary. The source for Ap and Kp was changed to Potsdam (WDC) on March 15. Values in red are based on the definitive WDC data. Flare enhanced and erroneous solar flux measurements are replaced by other same day measurements (QC).

[Solar Terrestrial Activity Report]