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HOME >> Topics >> M8.7/2B Flare (2012/01/23 03:38UT)
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CME associated with M8.7/2B flare observed by SOHO/LASCO-C3(ESA&NASA)

Intense solar energetic particle (proton) event occurred on 23, January in 2012 and reached its peak flux 6,310 PFU at 15:30UT on 24. This event was associated with M8.7/2B flare (N28W21) at 03:38UT on 23. Sudden Impulse (SI) by the CME by this flare was observed at 15:03UT on 24. Another X1.7/2B flare (N28W21) occurred at 17:37UT on 27. The solar energetic particle (proton) flux by this flare reached its peak 796 PFU at 02:05UT on 28.[update:2012/01/29]



X-ray flux observation by NOAA/GOES


M8.7/2B flare observed by SDO/AIA193(NASA)


Solar energetic particle (proton) flux observed by NOAA/GOES

Intense solar energetic particle events since 1967 (by peak flux)
1 1972/08/04 86,000(PFU)
2 1991/03/24 43,000(PFU)
3 1989/10/20 40,000(PFU)
4 2001/11/06 31,700(PFU)
5 2003/10/29 29,500(PFU)
6 2000/07/15 24,000(PFU)
7 2001/11/24 18,900(PFU)
8 2000/11/09 13,300(PFU)
9 2001/09/25 12,900(PFU)
10 1994/02/21 10,000(PFU)
11 1989/08/13 9,200(PFU)
12 1989/12/01 7,300(PFU)
13 2012/01/24 6,310(PFU)*
14 2005/01/17 5,040(PFU)
15 1992/05/09 4,600(PFU)


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