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 20 February 2001
⇐20010219 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010221⇒

NOAA
10 Active Regions
09349
09350
09351
09352
09353
09354
09355
09356
09357
09358
SMART
No Data
CHARM
No Data
Welcome to the Flare Prediction System. This page gives the active regions on the Sun today together with each regions probability for producing C-, M-, or X-class events. The flare probabilities were calculated using NOAA Space Weather Prediction Center data from nearly eight years of data starting November 1988 and ending June 1996. 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 cycle 22. For example, between November 1988 and June 1996 there were 302 regions classified Eai. As this class produced 62 M-class events, the mean M-class flare rate is ~62/302 or ~0.21 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( -0.21 ) ~ 0.19, or 19% for an Eai class region to produce one or more M-class flares in the next 24-hours. See 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: 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, 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), 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.

IDL Access

Today's NOAA Active Regions
Group Number
Location
Hale
Class
McIntosh Class
Sunspot
Area
Number of Spots
Flares
History
09349 N28W69
(779",477") 		α/α Axx/Hrx 0000/0020 01/01 -
09350 N18W50
(689",361") 		α/α Hsx/Hsx 0050/0070 01/01 -
09351 S21W91
(881",-337") 		α/β Axx/Cso 0000/0010 01/02 -
09352 S21E01
(-15",-228") 		β/β Bxo/Cso 0010/0020 03/06 -
09353 S22W37
(528",-266") 		β/β Bxo/Cso 0010/0030 05/06 -
09354 S09W20
(320",-39") 		β/β Dai/Dao 0150/0110 17/14 C2.2(14:47)
C2.1(15:37)
09355 N20E08
(-124",430") 		β/β Bxo/Cro 0010/0020 05/04 -
09356 S13W37
(555",-121") 		β/β Bxo/Bxo 0020/0010 05/04 -
09357 S25E06
(-89",-292") 		β/α Cro/Hsx 0020/0040 03/03 -
09358 S08E19
(-305",-21") 		β/β Cro/Bxo 0040/0010 06/02 -

Events not associated with currently named NOAA regions: C3.1(01:10) C1.5(17:06) /C5.4(20:43)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 20-Feb-2001 00:30 , the values to the right of the forward slashes representing yesterdays values or events. Regions with no data in above property fields have decayed and exhibit no spots. The region positions are valid on 20-Feb-2001 23:30.