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 7 April 2002
⇐20020406 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20020408⇒

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
Latest
Position
Hale
Class
McIntosh Class
Sunspot Area
[millionths]
Number of Spots
Recent
Flares
09884 S17W91
(910",-274") 		β/αγδ Bxo/Hrx 0030/0030 03/02 -
09885 N13W78
(908",188") 		βγ/βγδ Eai/Eki 0320/0550 15/22 -
09886 N14W65
(839",179") 		βγ/βγδ Dao/Dai 0120/0110 16/17 -
09887 N03W56
(790",-17") 		βγ/βγδ Eki/Eki 0630/0690 28/23 -
09888 S12W46
(672",-278") 		βγ/βγδ Cko/Dao 0140/0180 05/09 -
09892 N05W07
(116",-36") 		αγ/αγδ Axx/Hrx 0010/0010 02/02 -
09893 N19E26
(-396",206") 		βγ/βγδ Eki/Eai 0370/0320 21/15 -
09894 N14W36
(545",134") 		αγ/βγδ Hrx/Cro 0010/0020 02/06 -
09895 N06E31
(-489",-3") 		βγ/βγδ Bxo/Bxo 0020/0020 03/03 -
09896 S11E47
(-685",-261") 		αγ/αγδ Hsx/Hsx 0110/0100 01/01 -
09897 S01W16
(263",-132") 		βγ/βγ Dao/Dao 0050/0050 05/05 -
09898 S19E52
(-711",-378") 		βγ/βγ Dao/Dao 0040/0040 02/02 -
09899 N18E58
(-770",231") 		αγ/αγ Hax/Hax 0160/0160 01/01 -
09900 S29W07
(101",-564") 		βγ/- Dso/--- 0080/---- 14/-- -
09901 N20E23
(-351",220") 		βγ/- Bxo/--- 0060/---- 08/-- -
09902 N11E61
(-819",123") 		αγ/- Hax/--- 0120/---- 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 07-Apr-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 08-Apr-2002 00:30 .