show styles

22 August 2002
20020821 Week Rotation Today Rotation Week 20020823

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
McIntosh Class
Sunspot Area
Number of Spots
10066 N15W91
βγδ/αγδ Cao/Hsx 0040/0040 10/03 -
10067 N11W87
βγδ/βγδ Dao/Dao 0090/0080 10/11 -
10069 S08W72
βγδ/βγδ Ekc/Ekc 1650/1850 46/47 -
10071 N10W82
αγδ/αγδ Axx/Axx 0000/0000 01/01 -
10076 N13W57
αγδ/αγδ Hsx/Hsx 0010/0010 01/01 -
10079 S22W49
βγδ/βγδ Eao/Eai 0170/0230 22/31 -
10080 N15W37
βγδ/βγδ Dao/Cao 0070/0120 11/13 -
10083 S18W03
βγδ/βγδ Dao/Dso 0050/0030 13/05 -
10084 S16E12
βγδ/βγδ Cao/Cso 0110/0100 14/05 -
10085 S11E28
βγδ/βγδ Cko/Cko 0520/0480 10/03 -
10086 S21E15
βγδ/- Bxo/--- 0020/---- 04/-- -
10087 S07E60
βγδ/- Cho/--- 0170/---- 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 22-Aug-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 22-Aug-2002 23:30 .