Solar Section        


March 30, 2017

A short Summary of Carrington Rotation 2187

Carrington Rotation 2187 covered the time period from 2017-02-06 1724 UT – 2017-03-06 0126 UT.
315 Reports and images were submitted and can be viewed in ALPO’s Solar Archive for CR2187:

During the rotation we could observe 10 regions, of which half of them were only visible for about three days or less. The largest region, AR2638, reached its maximum area of 150 millionths for two days on February 23 and 24. The Total daily Active Region Area of 210 millionths reached its maximum on March 1st while the Wolf Number maxed out at 55 on March 3rd and 4th. The rotation did have two spotless days on February 9th and March 5th, bringing the total spotless days since Solar maximum to 47. In addition, on February 26th, South America was treated to a partial eclipse and three observers did submit images.

For this Rotation we would like to feature three images of the partial eclipse by three of our observers, Guilherme Grassmann, German Morales, and Avani Soares. Thanks to them, as well as all other contributors, for another great rotation. Please take a look at their images by clicking on the above link leading to our archive.
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

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