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 29 March 2001
⇐20010328 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010330⇒

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
09387 N08W80
(929",110") 		βγδ/αγδ Cso/Hsx 0150/0130 04/01 -
09389 S12W48
(694",-275") 		βγδ/βγδ Cro/Eao 0050/0080 13/13 -
09390 N13W52
(733",140") 		βγδ/βγδ Cso/Eso 0080/0110 08/09 -
09393 N13W14
(225",99") 		βγδ/βγδ Fkc/Fkc 2240/1590 51/55 -
09394 N09W19
(307",35") 		αγδ/αγδ Axx/Axx 0010/0010 01/01 -
09395 S13W06
(97",-330") 		βγδ/βγδ Cso/Cso 0060/0050 04/02 -
09396 S06W73
(906",-133") 		βγδ/βγδ Dso/Dao 0330/0290 12/15 -
09397 S09E05
(-82",-267") 		βγδ/βγδ Eai/Eso 0260/0200 17/17 -
09399 S30W63
(736",-520") 		βγδ/βγδ Cro/Dso 0030/0040 03/05 -
09400 N10W43
(641",77") 		αγδ/βγδ Axx/Bxo 0000/0020 01/03 -
09401 N22E03
(-46",243") 		βγδ/βγδ Cao/Dao 0160/0200 20/19 -
09402 N18W39
(572",203") 		αγδ/βγδ Axx/Cro 0010/0010 03/04 -
09403 S13E22
(-349",-322") 		βγδ/βγδ Bxo/Dro 0020/0030 05/04 -
09404 S05E36
(-559",-179") 		αγδ/βγδ Hax/Cso 0070/0070 01/03 -
09405 S13W34
(520",-310") 		βγδ/βγδ Bxo/Bxo 0040/0040 14/14 -
09406 N25E53
(-691",334") 		αγδ/αγδ Hax/Hax 0150/0150 01/01 -
09407 N11E50
(-718",104") 		αγδ/αγδ Hsx/Hsx 0080/0080 01/01 -
09408 S08E24
(-385",-241") 		βγδ/βγδ Cao/Cao 0090/0090 13/13 -

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 29-Mar-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 29-Mar-2001 23:30 .