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 21 August 1998
⇐19980820 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 19980822⇒

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
08299 N15W91
(912",244") 		α/β Hsx/Dao 0080/0320 01/06 -
08301 S22W86
(873",-358") 		α/α Hsx/Hsx 0070/0100 01/01 -
08304 S27W10
(146",-527") 		β/β Cso/Cso 0070/0090 05/04 -
08306 N28E04
(-58",341") 		α/α Hsx/Hsx 0030/0050 02/02 -
08307 N32E46
(-577",431") 		βδ/β Eko/Dho 0440/0330 08/07 C1.0(16:14)
/ C5.7(00:25)
08308 S21E32
(-468",-427") 		α/α Hsx/Hax 0100/0110 02/02 -
08309 N17E01
(-15",165") 		β/α Bxo/Axx 0030/0000 09/02 -
08310 N23E53
(-696",304") 		α/- Axx/- 0010/- 01/- -
08311 N19W12
(186",200") 		α/- Axx/- 0000/- 01/- -

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

Events not associated with currently named NOAA regions: C2.5(01:47) C2.7(06:17) C4.5(08:53) C5.1(21:03) M9.0(23:57) C1.8(12:24) C1.0(14:01) C1.7(15:29) C2.1(21:07)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 21-Aug-1998 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 21-Aug-1998 23:30 .