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 27 December 2001
⇐20011226 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20011228⇒

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
09742 N12W82
(923",180") 		βγ/βγ Eki/Fkc 0470/1070 25/49 -
09743 S09W74
(905",-180") 		βγ/βγ Cso/Cao 0070/0100 02/04 -
09745 N18W64
(815",242") 		βγ/βγ Dro/Cso 0010/0010 03/04 -
09747 N12W40
(600",106") 		αγ/βγ Hrx/Dso 0010/0030 01/04 -
09748 S10W62
(829",-220") 		βγ/βγ Dao/Eao 0300/0320 18/23 -
09751 N04W10
(165",-52") 		βγ/βγ Eki/Eki 0500/0380 33/25 -
09753 S19W05
(78",-422") 		βγ/βγ Dso/Dso 0050/0040 15/07 -
09754 S09E10
(-164",-265") 		βγ/βγ Eai/Eai 0250/0270 26/25 -
09755 S04E36
(-560",-163") 		βγ/βγ Cao/Cao 0200/0180 06/03 -
09756 S28E58
(-714",-500") 		αγ/αγ Hsx/Hsx 0040/0040 01/01 -
09757 S09W12
(196",-264") 		βγ/βγ Cso/Cso 0010/0010 03/03 -
09758 N13E06
(-97",96") 		αγ/αγ Axx/Axx 0000/0000 01/01 -
09759 N17E14
(-221",165") 		βγ/βγ Bxo/Bxo 0010/0010 02/02 -
09760 N06E21
(-340",-12") 		βγ/βγ Cro/Cro 0010/0010 03/03 -
09761 N09E61
(-824",90") 		αγ/αγ Hsx/Hsx 0050/0050 01/01 -
09762 N03W07
(116",-69") 		αγ/- Hsx/--- 0020/---- 01/-- -
09763 N06E62
(-838",42") 		αγ/- Hsx/--- 0060/---- 01/-- -

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 27-Dec-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 27-Dec-2001 23:30 .