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 19 May 2013
⇐20130518 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20130520⇒

Welcome to the Flare Prediction System. This page lists the active regions present on the Sun today, together with their probability of producing C-, M-, or X-class events. Flare probabilities are calculated using NOAA Space Weather Prediction Center data combined over 1969-1976 and 1988-1996 (details of which can be found in Bloomfield et al., 2012, The Astrophysical Journal Letters, 747, L41, along with full forecast verification testing). The percentage probabilities are based on the number of flares produced by regions classified using the McIntosh classification scheme (McIntosh, P., 1990, Solar Physics, 125, 251) during cycles 21 and 22. For example, over both time periods there were 377 regions classified Eai. As this class produced 131 M-class events, the mean M-class flare rate is ~131/377 or ~0.347 flares per day. Assuming the number of flares per unit time is governed by Poisson statistics, we can estimate a flaring probability for the following 24-hours using P( one or more flares ) = 1 - exp( -mean ), i.e., P = 1 - exp( -0.347 ) ~ 0.29, or 29% for an Eai class region to produce one or more M-class flares in the next 24-hours.

See Gallagher, P. T., Moon, Y.-J., Wang, H., Solar Physics, 209, 171, (2002),
Wheatland, M. S., 2001, Solar Physics, 203, 87 and Moon et al., 2001, Journal of Geophysical Research-Space Physics, 106(A12) 29951 for further details.

Click here for a description of the various active region classifications from the Royal Observatory of Belgium.
Region Flare Probabilities (%)
Number McIntosh C-class M-class X-class

NOTE: Occurrence of '...' indicates that McIntosh class was not observed in the period over which the Poisson flare rate statistics were determined. Values in parantheses/brackets give the NOAA/SWPC forecast probabilities for the occurrence of one or more C-, M-, or X-class flares. When viewed in real-time and before 22:00 UT, NOAA predictions are valid up to 22:00 UT on the current date. When viewed in real-time after 22:00 UT (or when viewing past dates), NOAA predictions are valid up to 22:00 UT on the following date. The most recent data can also be found at NOAA's 3-day Space Weather Predictions page.

Please contact Peter Gallagher if you have any comments or questions regarding this research.


Today's/Yesterday's NOAA Active Regions
NOAA Number
Latest
Position
Hale
Class
McIntosh Class
Sunspot Area
[millionths]
Number of Spots
Recent
Flares
11743 N20W83
(884",309") 		α/βγδ Axx/Dao 0010/0030 02/02 - / C1.2(05:05)
C1.2(05:03)
11744 N06W68
(875",55") 		β/βγδ Dao/Dao 0070/0100 05/23 -
11745 N14W41
(605",144") 		β/βγδ Dao/Cko 0210/0300 11/10 -
11746 S27W40
(544",-506") 		β/βγδ Dso/Cso 0120/0160 04/07 -
11747 S18W45
(639",-368") 		β/βγδ Cao/Dao 0040/0080 06/10 -
11748 N12W03
(48",84") 		βδ/βγδ Dao/Dai 0140/0220 12/24 - / C1.1(18:12)
C6.0(03:30)
11749 S22W91
(878",-350") 		βδ/βγδ Bxo/Cro 0010/0030 03/04 -
11750 S09W68
(869",-189") 		βδ/βγδ Dao/Cao 0080/0050 09/09 C4.7(21:11)
C6.3(15:07)
C1.1(14:13)
C1.4(12:22)
C1.1(11:42)
C3.4(09:08) / -
11752 N18W66
(825",247") 		βδ/βγδ Cro/Cro 0020/0020 04/07 -

Class (HH:MM) -Today
Class (HH:MM) -Yesterday

Events not associated with currently named NOAA regions: C1.5(03:28) C1.2(08:35) C4.2(17:06) C9.9(17:07) C1.3(06:29) C1.3(06:32) C2.9(20:16)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on . The greyed out and light-blue entries are values from the previous day. Slashed cells indicate that the active region has no spots. The latest positions of the active regions are given in both heliographic and heliocentric co-ordinates. The region positions are valid on .