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28 August 2001
20010827 Week Rotation Today Rotation Week 20010829

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
09580 N23W91
αγδ/αγδ Hsx/Hsx 0080/0080 01/01 -
09585 N13W85
βγδ/βγδ Dso/Dao 0050/0050 05/07 -
09587 S09W91
βγδ/βγδ Dao/Dao 0280/0210 07/12 -
09590 S29W28
αγδ/αγδ Hsx/Hax 0160/0180 04/03 -
09591 S18W08
βγδ/βγδ Fki/Fki 0720/0740 40/43 -
09595 N15W45
βγδ/- Axx/--- 0010/---- 02/-- -
09596 N22E40
αγδ/αγδ Hsx/Hsx 0170/0130 02/01 -
09597 N16E21
βγδ/βγδ Dao/Bxo 0050/0010 08/02 -
09598 S16W89
αγδ/αγδ Axx/Axx 0030/0030 01/01 -
09599 S18E51
βγδ/βγδ Bxo/Bxo 0010/0010 02/02 -
09600 N16E67
αγδ/αγδ Hsx/Hsx 0060/0060 01/01 -
09601 N10E71
αγδ/αγδ Hax/Hax 0060/0060 01/01 -

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 . 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 16-Jun-2005 23:00 .