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25 October 2001
20011024 Week Rotation Today Rotation Week 20011026

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
09667 N27W75
αγδ/αγδ Axx/Axx 0000/0000 00/01 -
09669 N14W65
βγδ/βγδ Dao/Cao 0050/0070 07/10 -
09670 S18W48
βγδ/βγδ Fai/Fki 0370/0450 28/22 -
09671 N16W76
βγδ/αγδ Bxo/Axx 0010/0010 03/03 -
09672 S19W27
βγδ/βγδ Dki/Dko 0490/0420 26/20 -
09673 N02W23
βγδ/βγδ Cao/Cao 0130/0110 04/08 -
09674 S08W46
αγδ/αγδ Axx/Axx 0010/0010 01/01 -
09675 S13E01
βγδ/αγδ Cso/Hsx 0020/0020 02/01 -
09676 N16E04
αγδ/αγδ Hsx/Hsx 0050/0050 02/01 -
09677 N19E05
βγδ/βγδ Dao/Cso 0040/0040 11/08 -
09678 N07E20
βγδ/βγδ Dao/Cao 0140/0050 22/10 -
09679 S11E32
βγδ/βγδ Cro/Bxo 0030/0010 04/03 -
09681 S25W09
βγδ/- Dso/--- 0040/---- 06/-- -
09682 N09E56
βγδ/- Dko/--- 0400/---- 04/-- -

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-Oct-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 25-Oct-2001 23:30 .