Dear Collaborators,

The level of solar activity is low-to-moderate. Target region NOAA 13647 has again remained stable in terms of spot area and number of spots since the last message, but has not produced any significant flares. The majority of flares were produced by NOAA regions 13638 (a beta/C-type sunspot group) and NOAA 13645 (a beta/D-type sunspot group) - NOAA 13638 generated three C-class flares and an M2.2 (on 21-Apr-2024 at 15:07 UT), while NOAA 13645 generated five C-class flares and an M1.0 (on 21-Apr-2024 at 12:39 UT). At this point the MM#003 Major Flare Watch terminates. The default target switches to NOAA 13645 because of its more central location in the cluster of active regions in the Southern hemisphere. More C-class activity is expected in the next 24 hours, with a chance for low M-class flares.

The position of NOAA 13645 on 21-Apr-2024 at 15:30 UT is:

S09W27 , ( 429", -75" )

See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan.

Regards,

Shaun Bloomfield (Northumbria University)