Big sunspot AR2644 has multiple dark cores as large as Earth and a 'beta-gamma' magnetic field that harbors latent energy for strong M-class explosions. So far the smaller sunspot, AR2645 [a Beta], is the more active of the two, producing C-flares at a 5x greater rate.
http://www.spaceweather.com/archive.php ... &year=2017
Spaceweather announced a 15 percent chance of an M-flare today (March 28) and 10 percent tomorrow (March 29).
Note that Sunspoit 2644 is geo-centered.
Here is a recap of all events on March 28, 2017 from http://www.swpc.noaa.gov/products/solar ... nt-reports
:Product: 20170328events.txt
:Created: 2017 Mar 28 1852 UT
:Date: 2017 03 28Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Please send comments and suggestions to SWPC.Webmaster@noaa.gov
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Missing data: ////
Updated every 5 minutes.
Edited Events for 2017 Mar 28
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#Event Begin Max End Obs Q Type Loc/Frq Particulars Reg#
#-------------------------------------------------------------------------------50 0001 0001 0009 LEA 3 FLA S11E57 SF 2645
70 + 0019 0027 0035 G15 5 XRA 1-8A C1.1 8.1E-04 2644 [1]
70 + 0021 0025 0042 HOL 3 FLA N13E18 SF ERU 264480 + 0048 //// 0048 LEA C RSP 025-115 III/1 2645
80 + 0050 0053 0059 LEA 3 FLA S10E58 SF DSD 2645
80 + 0050 0053 0055 G15 5 XRA 1-8A B9.1 1.4E-04 264590 0102 0102 0102 PAL G RBR 245 170
100 0135 0143 0146 LEA 3 FLA N13E18 SF 2644
110 + 0152 0200 0204 G15 5 XRA 1-8A B6.6 3.5E-04 2644
110 0154 0200 0210 LEA 3 FLA N13E16 SF 2644120 + 0256 0300 0303 G15 5 XRA 1-8A B3.1 8.6E-05
130 + 0318 0323 0325 G15 5 XRA 1-8A C3.1 6.3E-04 2645 [1]
130 0321 0322 0332 LEA 3 FLA S09E56 SF 2645140 + 0352 0357 0407 G15 5 XRA 1-8A B6.6 4.2E-04 2644
140 0355 0402 0422 LEA 3 FLA N13E14 SF 2644150 0447 0456 0503 G15 5 XRA 1-8A C3.2 1.7E-03 2645 [2]
150 0453 0459 0510 LEA 3 FLA S09E56 SF 2645160 B0508 U0508 0512 SVI 2 FLA S10E60 SF 2645
170 + 0656 //// 0703 LEA C RSP 025-180 III/1
180 + 0712 0719 0723 G15 5 XRA 1-8A C1.1 4.1E-04 2645 [3]
180 + 0715 0730 0747 LEA 3 FLA S11E52 SF DSD 2645190 + 0818 //// 0821 SVI C RSP 025-079 III/1
200 0855 0855 0855 SVI G RBR 245 100
210 0901 0910 0916 G13 5 XRA 1-8A B7.0 4.4E-04 2645
210 + 0904 0905 0916 SVI 3 FLA S08E54 SF ERU 2645220 0938 0944 0950 G13 5 XRA 1-8A B4.0 2.1E-04 2645
220 0941 0942 0947 LEA 2 FLA S09E52 SF 2645230 + 0955 1001 1004 G15 5 XRA 1-8A C1.0 3.5E-04 2645 [4]
240 + 1202 1202 1202 SVI G RBR 245 140
250 + 1318 1322 1325 G15 5 XRA 1-8A B2.8 7.2E-05 2645
260 + 1351 1355 1359 G15 5 XRA 1-8A B2.5 8.4E-05 2645
270 + 1441 1441 1441 SAG G RBR 245 110
280 + 1546 1551 1556 G15 5 XRA 1-8A B2.1 9.7E-05 2645
With sunspot 2644 approaching the center of the solar disc, it appears that it is not as active.
Notice the larger number of B and C-flares attributed to 2645.