Daily Archives: November 21, 2013

The Sun Online and solar activity. November 21, 2013

NOAA AR 1893 produced a M1.2 flare on November 21, peaking at 1111 UT. Very few information is currently available on this event, but it seems that, besides a weak type III burst no other radio emission is associated with it. Coronagraphic observations are not yet available, but SDO data hint at a CME signature. Owing to the position of AR 1893 on the west limb, a CME, if confirmed, would very likely not be geoeffective. We foresee mostly eruptive conditions for the next 48 hours, with C class flares possible from NOAA ARs 1893, 1897 and 1899. A small sunspot group emerged north of AR 1899, but it is too soon to evaluate its flaring capacity for the forecast period. An extra isolated M flare is not completely excluded from NOAA AR 1893 before it rotates behind the west limb.  We expect quiet geomagnetic conditions for the next 48 hours. All CMEs observed in the past 24 hours appear to be non geoeffective, including a partial halo CME, observed by LASCO on Nov. 21 at 0125 UT (backside event).

Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 21/11/13
Time GMT: 14:00
Exposure 0.12 sec.

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