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 4 April 2000
⇐20000403 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20000405⇒

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
08924 N12W91
(923",193") 		β/βγ Dao/Dao 0080/0330 04/11 -
08925 S19W83
(887",-293") 		α/β Axx/Dao 0010/0040 01/04 -
08931 S13W74
(885",-183") 		β/β Dao/Dao 0070/0140 11/17 -
08932 S12W46
(666",-125") 		β/β Dso/Cso 0040/0100 10/11 -
08933 N18W72
(855",320") 		β/β Dso/Dso 0240/0110 16/17 C9.7(15:12)
/ C2.1(18:47)
08935 S07W48
(698",-45") 		β/β Cao/Dao 0030/0120 06/13 -
08936 S14W08
(128",-128") 		βδ/βγ Dac/Dai 0390/0360 24/36 -
08939 N24E01
(-15",478") 		β/β Dao/Dao 0080/0120 11/09 -
08940 N14W02
(32",328") 		β/α Bxo/Hsx 0010/0020 05/01 -
08942 S10W39
(587",-84") 		α/β Axx/Cro 0000/0050 01/10 -
08943 N23W33
(475",448") 		β/β Cso/Dso 0050/0080 04/11 -
08944 N09E30
(-468",236") 		α/α Hsx/Hsx 0060/0090 01/01 -
08945 S18E32
(-477",-207") 		β/β Dso/Dso 0040/0100 05/06 -
08946 S24W23
(338",-296") 		α/- Axx/- 0000/- 01/- -
08947 N23W11
(166",462") 		β/- Axx/- 0000/- 02/- -

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

Events not associated with currently named NOAA regions: M1.0(01:18) C5.8(05:14) C1.9(18:00) C2.3(07:00) C2.8(11:03) C3.8(21:01)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 04-Apr-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 04-Apr-2000 23:30 .