Dear Collaborators,
The target region NOAA 12871 was the source of numerous B-class flares (the largest one being a B6.3 at 09/20/10:38 UT) in the past 24 hours. 12871 retains its beta/D-type configuration but increases in the sunspot area and number of spots. There also emerged two regions with sunspots, numbered as NOAA 12872 (N17E40, beta/C-type) and 12873 (N26W09, beta/B-type), which were relatively flare quiet. More B-class events are expected with a chance of C-class flares from the target region in the next 24-hour period.
The position of NOAA 12871 on September 21 at 03:30 UT is:
S29E48 (-622", -529")
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,
Ying Li (Purple Mountain Observatory)
mmmotd@solar.physics.montana.edu