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 4 April 2001
⇐20010403 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010405⇒

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
09393 N18W91
(905",293") 		βγδ/βγδ Fkc/Fkc 1080/1810 17/40 -
09395 S12W86
(929",-204") 		αγδ/αγδ Axx/Hsx 0010/0020 01/01 -
09397 S07W79
(928",-138") 		βγδ/βγδ Dao/Cao 0060/0080 05/09 -
09401 N25W72
(822",366") 		βγδ/βγδ Cao/Cao 0160/0140 06/13 -
09404 S05W45
(673",-167") 		βγδ/βγδ Cso/Dso 0030/0050 09/12 -
09406 N26W23
(335",316") 		αγδ/αγδ Hsx/Hax 0160/0200 02/02 -
09407 N13W29
(451",110") 		βγδ/αγδ Cso/Hsx 0100/0080 04/02 -
09408 S08W60
(818",-191") 		βγδ/βγδ Eki/Eki 0360/0310 20/24 -
09412 S15E11
(-176",-359") 		αγδ/αγδ Axx/Hax 0010/0040 02/02 -
09413 N11W58
(794",118") 		βγδ/βγδ Cao/Dso 0110/0030 09/07 -
09414 S23E30
(-439",-466") 		αγδ/αγδ Axx/Hsx 0010/0020 01/01 -
09415 S22E58
(-750",-413") 		βγδ/βγδ Dko/Dko 0470/0470 05/05 -
09416 N17W32
(484",179") 		βγδ/βγδ Dso/Dso 0040/0040 06/06 -
09417 S10E29
(-456",-268") 		αγδ/αγδ Axx/Axx 0000/0000 01/01 -
09418 N23E55
(-720",306") 		αγδ/- Hsx/--- 0130/---- 01/-- -
09419 N08W22
(354",21") 		βγδ/- Cso/--- 0010/---- 05/-- -

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 04-Apr-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 04-Apr-2001 23:30 .