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 12 October 2002
⇐20021011 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20021013⇒

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
10139 N09W60
(814",89") 		βγδ/βγδ Dki/Dkc 0590/0520 17/26 - / C2.0(10:15)
C1.7(09:29)
C1.1(04:26)
C1.2(01:40)
10140 S08W25
(398",-237") 		β/β Cso/Cho 0180/0200 04/17 -
10142 N05W31
(489",-18") 		α/α Axx/Axx 0000/0010 01/01 -
10144 N12W24
(379",90") 		β/β Dso/Dai 0110/0130 12/21 C2.6(19:17) / -
10145 N13E22
(-348",105") 		α/α Hsx/Hsx 0070/0070 01/01 -
10146 S09W19
(306",-258") 		α/β Hsx/Dao 0020/0040 01/06 -
10148 S20E29
(-434",-420") 		α/α Hsx/Hax 0040/0070 01/02 -
10149 N15E34
(-514",150") 		β/β Dsi/Dao 0220/0170 12/07 - / C1.3(14:19)
10152 N20W43
(610",242") 		β/β Dro/Cao 0010/0020 02/03 -
10154 S13E41
(-608",-299") 		β/α Cso/Hax 0030/0050 02/02 -
10155 S09W67
(864",-193") 		β/- Cro/--- 0030/---- 03/-- -
10156 N09W04
(65",31") 		β/- Bxo/--- 0010/---- 02/-- -
10141 S10W76
(908",-191") 		/ / / / - / C1.7(23:34)
C1.9(11:12)
10143 S16W91
(912",-257") 		/βγ /Dso /0100 /12 - / C2.6(18:59)
C3.7(17:07)
10147 S03W02
(33",-167") 		/β /Bxo /0010 /03 -
10150 S09W46
(676",-228") 		/α /Axx /0020 /02 -
10151 S14E10
(-160",-341") 		/ / / / -
10153 S05E20
(-324",-193") 		/α /Axx /0010 /01 -

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

Events not associated with currently named NOAA regions: C2.4(08:29)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 12-Oct-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 12-Oct-2002 23:30 .