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 20 September 2001
⇐20010919 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010921⇒

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 S13W38
(573",-305") 		βγ/βγ Fai/Fai 0190/0230 20/31 -
09617 N10W35
(540",67") 		βγ/βγ Bxo/Cro 0020/0020 11/05 -
09619 N16W69
(856",219") 		βγ/βγ Dso/Cso 0030/0020 05/04 -
09620 N12E16
(-257",83") 		βγ/βγ Cao/Hax 0210/0200 06/03 -
09621 N14E22
(-347",121") 		βγ/αγ Dao/Hsx 0200/0190 08/07 -
09622 N13W06
(97",96") 		βγ/βγ Cso/Dso 0030/0020 05/04 -
09623 N22E04
(-61",243") 		αγ/αγ Axx/Hsx 0000/0010 01/01 -
09624 N03E28
(-448",-56") 		αγ/αγ Hsx/Hsx 0120/0100 01/01 -
09625 S30W38
(509",-555") 		βγ/βγ Cro/Cso 0020/0030 04/05 -
09626 N26E11
(-164",309") 		βγ/αγ Cro/Hsx 0030/0010 06/01 -
09627 N04E44
(-662",-20") 		αγ/αγ Hax/Hax 0050/0060 02/01 -
09628 S18E50
(-695",-366") 		βγ/βγ Fkc/Dao 0410/0160 16/06 -
09629 N26E24
(-349",316") 		βγ/βγ Cao/Cao 0070/0070 09/09 -
09630 N27W50
(651",361") 		βγ/- Cso/--- 0010/---- 03/-- -
09631 N08W29
(459",27") 		βγ/- Dao/--- 0060/---- 09/-- -
09632 S18E62
(-801",-346") 		βγ/- Eko/--- 0390/---- 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 20-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 20-Sep-2001 23:30 .