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 13 May 2002
⇐20020512 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20020514⇒

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
No Prediction Found

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
09933 N18W91
(905",293") 		αγδ/α Hsx/Hax 0050/0090 01/01 -
09934 S16W86
(913",-268") 		βγδ/βγδ Eki/Fko 0960/1060 25/27 -
09937 S08W64
(849",-183") 		βγδ/βγδ Dai/Dai 0150/0240 14/18 -
09938 S06W61
(830",-157") 		αγδ/αγδ Axx/Hsx 0000/0010 01/01 -
09940 N18W52
(715",222") 		βγδ/βγδ Cso/Eso 0030/0030 06/07 -
09945 S04W12
(198",-183") 		βγδ/βγδ Dki/Dko 0320/0310 20/09 -
09946 S05W02
(33",-202") 		βγδ/βγδ Dao/Dao 0040/0060 10/16 -
09948 S22E36
(-520",-445") 		βγδ/βγδ Eko/Eko 0430/0420 08/06 -
09949 S16W34
(513",-357") 		βγδ/αγδ Dso/Hsx 0040/0010 06/03 -
09950 S06E17
(-278",-213") 		βγδ/βγδ Cso/Bxo 0090/0030 08/05 -
09951 N10E54
(-760",94") 		αγδ/αγδ Axx/Axx 0020/0020 01/01 -
09952 S15W36
(542",-339") 		αγδ/- Axx/--- 0000/---- 03/-- -

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

Events not associated with currently named NOAA regions: None

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 13-May-2002 00:30 . 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 13-May-2002 23:30 .