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5 December 2001
20011204 Week Rotation Today Rotation Week 20011206

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
McIntosh Class
Sunspot Area
Number of Spots
09715 N05W77
βγδ/βγδ Dko/Dki 0550/0690 16/27 -
09716 S06W63
βγδ/βγδ Dao/Dao 0080/0080 11/19 -
09717 N04W27
βγδ/βγδ Eao/Fai 0170/0210 06/11 -
09718 S06W23
βγδ/βγδ Eki/Eki 0660/0650 27/30 -
09720 S20W22
βγδ/βγδ Eso/Dao 0040/0040 06/11 -
09721 N12W12
βγδ/βγδ Cso/Cao 0200/0190 03/06 -
09723 S05W11
βγδ/αγδ Dso/Axx 0040/0010 05/02 -
09724 N10E19
βγδ/βγδ Cso/Cso 0050/0060 03/03 -
09725 S10W86
βγδ/βγδ Dso/Dso 0050/0030 06/06 -
09726 S16E28
βγδ/βγδ Cso/Cso 0060/0070 04/02 -
09727 S22E43
βγδ/βγδ Cko/Cso 0220/0120 04/03 -
09728 N36W20
βγδ/βγδ Dso/Dso 0020/0020 03/03 -
09729 N24W10
βγδ/- Cao/--- 0040/---- 06/-- -
09730 S13E35
αγδ/- Hrx/--- 0020/---- 02/-- -

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 05-Dec-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 05-Dec-2001 23:30 .