The Sun Online and solar activity. December 28, 2013

There were six C flares on the Sun during the past 24 hours. The brightest one was a C2.3 flare released by NOAA AR 11934, which peaked at 23:36 UT on December 27. Since AR 11934 and 11936 are still showing flux emergence, the probability for C flares over the next 48 hours is high (around 90%) and
for M flares around 25%.Over the past 24 hours, the solar wind speed as observed by ACE gradually decreased from about 310 km/s to about 280 km/s. Around 18h UT on December 27, the magnitude of the Interplanetary Magnetic Field dropped suddenly from about 8 nT to about 3 nT. A continuation of
nominal solar wind conditions is expected on December 28-30. Geomagnetic activity has been quiet over the past 24 hours (NOAA Kp between 0 and 2). Quiet geomagnetic conditions (K Dourbes < 4) are expected on December 28, 29, and 30, with a slight chance of active conditions (K Dourbes = 4) in
the first half of December 30 (in case the Earth suffers a glancing blow from the CME first observed by LASCO C2 at 7:36 UT on December 26).

SIDC

Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 12/28/13
Time UT: 17:00
Exposure 0.8 sec.

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