Solar Section        

 
 

March 23, 2018

A Short Summary of Carrington Rotation 2198

Carrington Rotation 2198 covered the time period from 2017-12-03 1441 UT – 2017-12-30 2231 UT .
162 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 CR2198:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2198

As in the previous rotation, we could observe 3 Active Regions AR2690-AR2691. AR2690, just a little more than a pore, was visible on 12/7 and 12/8. AR2691 made it one day longer, and was visible for three days from 12/11 till 12/13. AR2691 was visible for 8 days and grew to a size of 160 millionths and 12 spots on 12/25, while it produced 10 B-class flares on 12/22 and 23. Active Regions were visible on 13 days, and 14 days were spot less, bringing the spotless days since solar Max at the end of the rotation to 137. The highest Wolf Number of 22 was recorded on 12/24 and 25. The highest total Active Region Area for the day of 160 millionths was recorded on 12/25. This rotation showed a little more activity with a Total Active Region Area for the Rotation of 650 millionths than the previous one.

For this rotation we would like to feature three images by three of our observers, Raffaello Braga, Guilherme Grassmann, and Theo Ramakers. 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 CR2198.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

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