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1 December 2003
20031130 Week Rotation Today Rotation Week 20031202

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
10507 N07W91
βγδ/βγδ Dao/Dko 0320/0460 08/11 -
10508 S19W85
βγ/βγ Dai/Eac 0230/0260 15/22 C1.3(14:51)
/ C2.1(15:15)
10509 S11W38
α/β Hax/Dso 0040/0070 02/04 -
10510 S23W30
β/β Dai/Eai 0090/0100 27/28 C1.1(18:38) / -
10511 S15W58
β/β Bxo/Cso 0030/0030 06/07 -
10512 N06W50
α/α Hsx/Axx 0010/0010 01/02 -
10513 N13E04
α/α Hsx/Hsx 0070/0080 02/01 -
10515 S02E28
β/β Bxo/Dso 0030/0080 08/07 -
10516 S17E30
β/β Dao/Cso 0090/0070 07/05 -
10517 S07E53
β/- Cao/--- 0160/---- 02/-- -
10514 S15W91
/ / / / -

Class (HH:MM) -Today
Class (HH:MM) -Yesterday

Events not associated with currently named NOAA regions: C4.6(00:06)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 01-Dec-2003 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 01-Dec-2003 23:30 .