Sunspot Summary Carrington Rotation 2106
Written by Howard Eskildsen
Observations in Ca-K
Start date: 2011/01/20, 09:10 UT, End date: 2011/02/16, 17:22 UT.
Notes:
Two spots persisted from the prior rotation; AR 1147 was large, while AR 1148 was barely visible by the SW limb. AR 1147 persisted and was joined by AR 1149 just to the north and the pair crossed the solar disk. AR 1150 appeared just as they rotated from view. Several small spots with little activity appeared over the next two weeks, and then AR 1158 burst onto the scene and enlarged until visible to the unaided eye. It produced the first X-class flare of cycle 24, the first in four years. It persisted through
the end of the rotation and was joined by another large spot, AR1161 before the end of the cycle.
Dates expressed as yymmdd (Universal Date)
Sunspot Location Date Date
Number First Seen Appeared Last seen Comments
1147 NE Limb ***** 110127 Present before the start of the rotation, large, some complexity, but it was quiescent. Remained large as it rotated from view.
1148 SW Quad ***** 110121 Tiny remnant of a small spot during prior CR, fading as it rotated from view.
1149 N Hemisphere 110121 110127 Appeared abruptly just north of AR 1147and developed rapidly. Persisted until carried out from view by solar rotation. Minor flaring.
Pore NW Quad 110121 110122 Tiny pore in new plage.
1150 SE Limb 110127 110204 Rotated into view. Gradually enlarged, then slowly faded from view.
1151 NW Quad 110128 110129 Small, plage visible two days before spot appeared near NW limb.
1152 S Hemiphere 110204 110206 Per spaceweather.com; I was not able to image the day first appeared. Faded from view.
1153 NW Quad 110206 110209 Small spot near NW limb. Rotated from view.
1154 NW Quad 110208 110208 Short-lived. I was not able to image
1155 NE Quad 110208 110208 Another one-day-wonder that I was not able to image.
1156 SE Quad 110208 110213 Small, gradually faded from view.
1157 NE Quad 110208 110216 Persisted until carried from view by solar rotation.
1158 SE Quad 110211 ***** Dramatically enlarged, visible through filter without telescope, produced first X-class flare in 4 years, the first of cycle 24.
1159 NE Quad 110211 110215 Small, gradually faded from view.
1160 NE Quad 110213 110214 Small, in the returning remnants of faculae of AR1147/1149 complex
1161 NE Quad 110213 ***** Small in size when first visible on the eastern limb, but grew rapidly through the end of the rotation.
