Dear Collaborators,
Solar activity has increased since the last message. The target region NOAA 12907 was the source of more than ten C-class flares (the largest one being a C6.0 flare at 12/14/23:44 UT). 12907 has been classified as a Beta-Gamma/D-type region. NOAA 12906 (S29E21, beta/C-type) also produced a C1.6 flare as well as a few B-class events. Note that there emerged a new region with sunspots (around S20E70) near the target region. If possible, please also include this new region in your field of view, which shows a rapidly increased current helicity. More C-class activities are expected with a chance of an M-class flare in the next 24 hours.
The position of NOAA 12907 on December 15 at 04:30 UT is:
S21E46 (-656", -339")
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