Solar Section        


June 05, 2017

A short Summary of Carrington Rotation 2190

Carrington Rotation 2190 covered the time period from 2017-04-29 1509 UT – 2017-05-26 2030 UT.
Solar Activity decreased during the rotation, and so did the number of submissions. 325 Submissions were added to the archive at the time of this summary, and can be viewed in ALPO’s Solar Archive for CR2190:

During the rotation we could observe 9 regions. The rotation started on 2017-04-29 with 3 Active Regions, a Wolf number of 35, and a total Active Region Area of 100 millionths which was the highest Total Active Region Area for the rotation. The highest Wolf Number of 55 was reached towards the end of the rotation on 2017-05-23. The rotation had a period of 7 spotless days from 5/10 till 5/16, bringing the total spotless days since Solar Maximum to 72. Two areas contended for the largest daily area of 80 millionths, AR2664 on May 5th and AR2659 on 5/26. The rotation ended with one Active Region, AR2659, having a Total Active Region Area of 80 millionths and a Wolf Number of 19. Besides the number of Spotless days, the low Active Region Areas, and the low number of spots compared to the previous rotation, CR2190 included three very short lived regions lasting only 1 (AR2657), 2 (AR2660), and 4 (AR2655) days only.

For this Rotation we would like to feature three images by three of our observers, Guilherme Grassmann, Christian Viladrich and Howard Eskildson. Thanks to them, as well as all other contributors, for another great rotation. Please take a look at their images by clicking on the link above, leading to our archive for CR2190.
Clear Skies,
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

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