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 21 September 2001
⇐20010920 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010922⇒

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
09616 S12W51
(725",-271") 		βγ/βγ Fao/Fai 0180/0190 18/20 -
09619 N17W81
(900",258") 		βγ/βγ Bxo/Dso 0020/0030 03/05 -
09620 N12E03
(-48",79") 		βγ/βγ Dao/Cao 0210/0210 09/06 -
09621 N15E08
(-128",130") 		βγ/βγ Dao/Dao 0180/0200 10/08 -
09622 N13W19
(303",102") 		βγ/βγ Dao/Cso 0060/0030 14/05 -
09623 N21W10
(155",229") 		αγ/αγ Axx/Axx 0000/0000 01/01 -
09624 N03E15
(-247",-66") 		αγ/αγ Hsx/Hsx 0100/0120 01/01 -
09625 S28W50
(645",-512") 		βγ/βγ Bxo/Cro 0010/0020 02/04 -
09626 N26W00
(0",307") 		βγ/βγ Bxo/Cro 0040/0030 07/06 -
09627 N04E29
(-462",-39") 		βγ/αγ Cso/Hax 0040/0050 03/02 -
09628 S18E37
(-546",-384") 		βγ/βγ Fkc/Fkc 0800/0410 33/16 -
09629 N26E09
(-134",308") 		βγ/βγ Dso/Cao 0060/0070 07/09 -
09630 N27W50
(651",361") 		βγ/βγ Cso/Cso 0010/0010 03/03 -
09631 N08W29
(459",27") 		βγ/βγ Dao/Dao 0060/0060 09/09 -
09632 S18E62
(-801",-346") 		βγ/βγ Eko/Eko 0390/0390 06/06 -

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 21-Sep-2001 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 21-Sep-2001 23:30 .