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
20120531 117.3 174 142 73 8.9 9 3-22 31222241 32332321 346-451 10    
20120530 111.0 136 94 78 5.9 6 3-9 21122221 31122321 382-526 1    
20120529 106.3 157 110 73 4.8 5 2-9 11011122 12112222 346-445      
20120528 110.3 196 118 87 4.1 4 0-9 00012221 01013322 346-410      
20120527 110.7 166 124 83 2.5 2 0-5 01100100 11011221 339-379 1    
20120526 110.0 249 134 70 2.5 2 0-9 21110000 21121211 347-460 2    
20120525 117.2 240 183 86 5.4 5 3-9 21121211 22122321 434-540 6    
20120524 115.5 182 139 83 6.1 6 5-7 22222221 23322322 440-723 2    
20120523 117.2 189 111 91 16.5 16 7-39 45421222 44432232 440-723 1    
20120522 121.3 194 112 95 19.4 19 9-32 34224444 24233433 355-478      
20120521 125.1 200 142 109 4.4 4 0-22 00000041 11022332 333-407      
20120520 130.8 209 152 124 10.3 10 2-27 34323110 45312211 350-469      
20120519 130.9 207 115 110 4.5 4 3-7 21111111 22122211 351-451 3    
20120518 132.2 226 170 118 7.5 8 4-15 32121222 32121323 362-479 8    
20120517 136.3 263 187 114 3.5 4 2-6 21101011 21112212 344-461 5 1  
20120516 130.9 239 163 122 9.0 9 4-22 21112234 21112224 344-447 3    
20120515 129.0 298 178 125 3.8 4 0-7 22111002 22212202 348-480 5    
20120514 130.0 233 173 156 3.9 7 0-12 31000011 22111212 424-514 7    
20120513 130.5 236 161 138 10.4 10 6-18 33222233 33322233 443-540 4    
20120512 129.5 227 143 85 8.8 9 6-15 32223222 32222323 452-623 9    
20120511 136.4 238 135 102 10.4 10 5-22 43221322 44332321 476-576 20    
20120510 130.7 238 157 93 9.9 10 5-22 23222124 33222233 557-603 17 2  
20120509 127.3 220 154 79 26.4 26 15-39 44434454 44434344 420-584 7 3  
20120508 122.8 228 145 90 8.5 8 3-27 12112224 12123323 285-461 4 1  
20120507 121.7 162 98 79 2.3 2 0-6 00021100 01122211 283-302 11 1  
20120506 117.6 138 108 104 4.0 4 0-7 10122110 21222211 285-331 14 2  
20120505 116.0 140 92 88 2.5 2 0-5 00011101 11022212 275-329 18 2  
20120504 114.0 219 133 101 2.8 3 0-7 21000110 22001211 289-332 6    
20120503 114.0 162 108 107 7.4 7 4-15 32211113 32222223 272-324 3    
20120502 115.5 190 137 109 3.8 4 0-9 21011002 11111213 271-350 4    
20120501 109.9 189 106 99 3.0 3 2-6 00100112 00112211 278-351 4    
Average 121.5 204.7 136.3 99.1 7.18 7.06              
International sunspot number: 69.1
K factor   0.34 0.51 0.70                  

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, 2012. 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]