Solar Section        


December 11, 2017

A Short Summary of Carrington Rotation 2197

Carrington Rotation 2197 covered the time period from 2017-11-06 0713 UT – 2017-12-03 1441 UT.
286 Submissions were added to ALPO’s Solar archive at the time of this writing. The submissions can be viewed in ALPO’s Solar Archive for CR2197:
During the rotation, we could observe 3 Active Regions AR2687-AR2689 of which AR2688, which was very small, was only visible for one day. The duration of the 2 other active regions was substantial shorter than the Active Regions during the previous rotation with 5 resp. 6 days. Active Regions were visible on 11 days, and 16 days were spot less, bringing the spotless days since solar Max. to 123. The highest Wolf Number of 26 was recorded on 11/18, the day that AR2688 was visible in addition to AR2687. The highest total Active Region Area for the day of 90 millionths was recorded on 11/16 and 11/17. The largest region for the rotation was AR2685 covering an area of 70 millionths on 10/23. This was so far the least active region since Solar Maximum with the Total Active Region Areas for the rotation of 540 millionths and 16 spotless days. The last full day of the rotation was spotless, for spotless day 123 since Solar Max.

For this rotation we would like to feature three images by three of our observers, Theo Ramakers, Howard Eskildsen, and John ONeal. Thanks to them, as well as all other contributors for another great rotation. Please take a look at all the drawings/images by clicking on the link above which links to our archive for CR2197.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS


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