Solar Section        


July 17, 2017

A short Summary of Carrington Rotation 2191

Carrington Rotation 2191 covered the time period from 2017-05-26 2030 UT – 2017-06-23 0117 UT.
The rotation showed a decrease in Active Regions compared to previous rotations, and so did the number of submissions. 298 Submissions were added to the archive at the time of this summary, and can be viewed in ALPO’s Solar Archive for CR2191:

The rotation started 2017-05-26 with 1 Active Region and a Wolf number of 22. The total Active Region Area was 170 millionths. During the rotation we could observe 5 regions, AR2659 – AR2664. Please note that AR2660 was a short lived region during the previous rotation. The highest Wolf Number of 35 was reached on the last day of the rotation on 2017-06-23, while AR2659 was the largest Active Region of the rotation at the 3rd day of the rotation on 5/29 with 220 millionths. The rotation had a period of 4 spotless days from 6/10 till 6/13 as well as a single day on 5/31, bringing the total spotless days since Solar Maximum to 77. The rotation ended with three Active Regions, AR2662, 63 and 64, having a Total Active Region Area of 120 millionths and a Wolf Number of 35.

For this Rotation we would like to feature three images by three of our observers, Jon O’Neil, Randy Tatum, and Dave Tyler. 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 CR2191.
Clear Skies,
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

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