Dear Collaborators,

Solar activity was at a moderate level in the past 24 hours. The largest event during the period was an M2.0 flare at 22:46 UT yesterday, produced by the target region NOAA 13615. 13615 also produced ten C-class flares including a C9.0. This region has been designated as a beta-gamma-delta/E-type configuration, with increasing the sunspot area but decreasing the number of spots. It is showing mixed polarities in the intermediate portion. M-class activities are very likely including an above-M5 flare in the next one or two days.

The position of NOAA 13615 on March 21 at 08:30 UT is:

S12E34 (-528", -103")

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)