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25 May 2002
20020524 Week Rotation Today Rotation Week 20020526

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
09954 S21W64
αγδ/βγδ Hsx/Dso 0020/0040 01/05 -
09957 N11W46
βγδ/βγδ Eac/Eac 0350/0420 46/46 -
09958 N04W58
αγδ/αγδ Hsx/Hsx 0040/0060 01/01 -
09960 N14W23
--/-- Cao/Dac 0070/0100 13/10 -
09961 S22W05
βγδ/βγδ Eai/Eai 0260/0290 23/27 -
09962 N15W06
βγδ/βγδ Cao/Cso 0040/0030 04/05 -
09963 N15E09
βγδ/βγδ Dko/Dho 0360/0420 16/10 -
09964 S14W30
βγδ/βγδ Bxo/Bxo 0010/0010 03/04 -
09965 S10E23
βγδ/βγδ Cso/Cso 0030/0060 03/06 -
09966 N09E06
βγδ/βγδ Bxo/Bxo 0010/0010 03/04 -
09967 N13E19
βγδ/αγδ Cso/Axx 0030/0010 05/01 -
09968 S13E12
βγδ/βγδ Cso/Cso 0020/0020 04/04 -
09969 N09E53
βγδ/- Dso/--- 0040/---- 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 25-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 25-May-2002 23:30 .