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 28 April 2001
⇐20010427 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010429⇒

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
09431 S10W91
(937",-161") 		αγδ/αγδ Axx/Axx 0000/0010 01/01 -
09433 N17W52
(719",206") 		βγδ/βγδ Fki/Fki 0910/0890 45/64 -
09435 S20W91
(894",-321") 		βγδ/βγδ Cao/Dao 0160/0180 03/04 -
09436 S10W20
(322",-276") 		αγδ/αγδ Hsx/Hsx 0160/0160 01/01 -
09437 N09W19
(307",35") 		βγδ/βγδ Cao/Cso 0030/0040 05/09 -
09439 S20W69
(836",-364") 		αγδ/βγδ Hrx/Cso 0020/0020 01/02 -
09440 N08W09
(148",14") 		βγδ/βγδ Dro/Bxo 0030/0010 06/06 -
09441 N08E24
(-385",22") 		βγδ/βγδ Dao/Cso 0150/0030 15/04 -
09442 N28E33
(-459",355") 		αγδ/αγδ Hsx/Hsx 0060/0040 01/01 -
09443 S10E07
(-114",-282") 		βγδ/βγδ Bxo/Bxo 0010/0010 03/03 -
09444 S11E53
(-748",-251") 		αγδ/- Hsx/--- 0060/---- 03/-- -
09445 N23E62
(-775",317") 		βγδ/- Cao/--- 0060/---- 04/-- -

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 28-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 28-Apr-2001 23:30 .