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22 December 2000
20001221 Week Rotation Today Rotation Week 20001223

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
09264 S24W86
β/β Cso/Dso 0050/0070 05/10 -
09268 S18W43
α/α Hsx/Hsx 0070/0090 02/01 -
09269 N15W56
β/β Bxo/Cao 0010/0030 07/06 C1.4(02:46) / -
09272 N14W85
α/α Axx/Axx 0000/0000 01/01 -
09273 N20W18
β/β Bxo/Bxo 0010/0010 05/06 -
09278 N09W05
β/β Eao/Dai 0080/0090 15/22 -
09279 S13E14
β/β Cso/Fso 0130/0170 06/08 -
09280 N08E34
β/β Eko/Dko 0450/0510 15/14 C2.6(19:31)
/ C2.8(07:27)
09281 N06E06
β/β Bxo/Cro 0000/0020 04/03 -
09282 N19E55
α/- Hax/- 0050/- 01/- -

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

Events not associated with currently named NOAA regions: C2.3(03:51) C1.7(10:07) C1.5(13:21) C2.4(14:03) C1.8(20:11) C1.9(06:28) C1.6(09:38)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 22-Dec-2000 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 22-Dec-2000 23:30 .