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 29 April 2001
⇐20010428 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20010430⇒

NOAA
10 Active Regions
09433
09435
09436
09437
09439
09440
09441
09442
09444
09445
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
09433 N17W64
(813",305") 		βγδ/βγδ Fki/Fki 0780/0910 39/45 C1.8(03:51)
/C3.1(06:52)
C7.0(09:11)
09435 S20W91
(887",-323") 		α/β Hax/Cao 0100/0160 01/03 -
09436 S10W33
(508",-106") 		α/α Hax/Hsx 0140/0160 01/01 -
09437 N10W33
(508",222") 		β/β Cso/Cao 0020/0030 02/05 -
09439 S23W81
(859",-358") 		α/α Hrx/Hrx 0030/0020 02/01 -
09440 N08W22
(351",196") 		β/β Dao/Dro 0030/0030 04/06 -
09441 N07E09
(-147",184") 		β/β Dao/Dao 0190/0150 16/15 -
09442 N28E21
(-299",501") 		α/α Hax/Hsx 0070/0060 01/01 -
09444 S11E53
(-742",-138") 		α/- Hsx/- 0060/- 03/- -
09445 N23E63
(-776",398") 		β/- Cao/- 0060/- 04/- C1.4(17:25)
C2.4(17:42)
C2.7(19:21)

Events not associated with currently named NOAA regions: C2.1(08:23) C3.0(09:08) C1.9(10:57) C2.0(16:35) C2.6(20:04) C3.2(23:23) /C2.1(03:19) C1.7(04:55) C2.8(20:08) C1.7(22:12)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 29-Apr-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 29-Apr-2001 23:30.