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21 February 2024
20240220 Week Rotation Today Rotation Week 20240222

NOAA Number McIntosh Class C-class M-class X-class

13581
13584
13586
13590

Axx/Axx
Axx/Axx
Hsx/Cso
Fki/Eho
MCEVOL
MCSTAT
NOAA
2 3 5
2 3 5
6 5 5
... 89 75
MCEVOL
MCSTAT
NOAA
0 1 1
0 1 1
0 3 1
... 61 30
MCEVOL
MCSTAT
NOAA
0 0 1
0 0 1
0 0 1
... 11 5

Solar Monitor's flare prediction system's probabilities are calculated using NOAA Space Weather Prediction Center data. There are two main methods, MCSTAT and MCEVOL, that use sunspot-group McIntosh classifications and Poisson statistics to calculate flaring probabilities valid for a 24-hr period*. The flaring probabilities are calculated using historical data from the periods 1969-1976 & 1988-1996 (MCSTAT) and 1988-2008 (MCEVOL).

MCSTAT – Uses point-in-time McIntosh classifications to calculate Poisson flaring probabilities. Details about the method [1] and forecast verification testing [2] can be found in the following papers:

[1] Gallagher, P. T., Moon, Y.-J., Wang, H., Solar Physics, 209, 171, (2002)
[2] Bloomfield et al., 2012, The Astrophysical Journal Letters, 747, L41

MCEVOL – Uses the evolution of McIntosh classifications over a 24-hr period to calculate Poisson flaring probabilities. Details about the method and flaring rate statistics can be found in the following:

[1] McCloskey, A.E., Gallagher, P.T. & Bloomfield, D.S., Solar Physics, 291, 1711, (2016)

Further Reading:
Wheatland, M. S., 2001, Solar Physics, 203, 87
Moon et al., 2001, Journal of Geophysical Research-Space Physics, 106(A12) 29951


Notes:

'...' = McIntosh class or evolution was not observed in the period over which the Poisson flare rate statistics were determined.
* 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 queries 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
13581 S21W91
(905",-346")
α/α Axx/Axx 0010/0010 01/01 -
13584 S15W73
(897",-215")
α/α Axx/Axx 0010/0010 01/02 -
13586 N27W19
(282",539")
α/β Hsx/Cso 0090/0160 01/01 -
13590 N17E39
(-585",371")
βγ/β Fki/Eho 0760/0530 07/04 -
13583 N08W91
(959",131")
/β /Fso /0170 /06 -
13585 N13W49
(715",293")
/ / / / -
13587 S20W42
(611",-246")
/ / / / -
13588 S03W57
(814",14")
/ / / / -

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

Events not associated with currently named NOAA regions: C2.4(00:32) C3.0(00:44) C4.4(01:55) C2.4(03:38) C1.8(07:31) C1.8(10:22) C1.5(11:28) C1.8(11:34) C1.4(11:46) C1.5(13:09) C2.1(13:41) C1.9(14:14) C4.2(15:39) C3.4(18:14) C3.3(19:22) C2.7(02:56) C2.8(15:47) C2.7(16:56)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 21-Feb-2024 00:30 UT . 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 21-Feb-2024 20:30 UT .