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20 May 2023
20230519 Week Rotation Today Rotation Week 20230521

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

13302
13305
13308
13310
13311
13312
13313

Hsx/Hsx
Dai/Dsi
Axx/Bxo
Cao/Cao
Bxo/Axx
Cko/Dho
Ekc/Dao
Cro/---
Hsx/---
MCEVOL
MCSTAT
NOAA
3 5 5
56 66 60
17 22 20
0 35 35
63 93 90
... 13 30
... 5 5
MCEVOL
MCSTAT
NOAA
0 3 1
12 16 30
2 3 1
0 12 5
0 82 70
... 2 15
... 3 1
MCEVOL
MCSTAT
NOAA
0 0 1
0 2 10
0 0 1
0 1 1
0 20 30
... 0 1
... 0 1

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
13302 N18W72
(858",302")
α/α Hsx/Hsx 0050/0030 01/01 -
13305 N12W71
(877",207")
β/βγ Dai/Dsi 0240/0100 18/12 C6.4(20:19)
C5.2(19:57) / -
13307 S09W34
(525",-120")
α/β Axx/Bxo 0010/0010 01/05 -
13308 N12W55
(761",216")
β/β Cao/Cao 0070/0060 15/08 -
13309 S18W91
(901",-293")
β/α Bxo/Axx 0010/0010 03/01 -
13310 S20E34
(-499",-298")
β/β Cko/Dho 0320/0250 08/05 -
13311 N17E46
(-653",300")
βδ/β Ekc/Dao 0330/0110 12/06 -
13312 S25E56
(-713",-384")
β/- Cro/--- 0040/---- 06/-- -
13313 N22E61
(-770",370")
α/- Hsx/--- 0030/---- 01/-- -
13301 N14W79
(903",235")
/α /Axx /0005 /03 -
13303 S10W91
(933",-165")
/ / / / -
13304 N20W91
(890",323")
/ / / / -

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

Events not associated with currently named NOAA regions: C6.0(09:53) C6.7(10:09) C7.2(14:18) C3.8(16:14) C4.1(16:48) C4.9(17:00) C3.7(17:37) C4.8(17:59) C7.2(18:42) C4.3(19:37) C6.1(20:57) M2.4(07:41) M1.1(09:18) M1.6(10:48) M8.9(12:25) M5.7(14:54) M1.2(18:57) M5.2(22:52)

Note: The tabulated data are based on the most recent NOAA/USAF Active Region Summary issued on 20-May-2023 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 20-May-2023 23:30 UT .