Solar Section        


September 22, 2018

A Short Summary of Carrington Rotation 2207

Carrington Rotation 2207 covered the time period from 2018-08-06 0143 UT – 2018-09-02 0729 UT.
Image submissions increased substantial to 327 Images/Observations. The probable cause was the increase in Active Regions and number of days sunspots were visible. The submissions can be viewed in ALPO’s Solar Archive for CR2207:

Following the large number of spotless days in the previous 2 months, CR2207 was interesting. Not only caused by the increase in spots, but also the attention AR2720 received because of its reverse polarization shown in the magnetogram, suggesting it might be a cycle 25 area. STCE disputed the claim by suggesting its very low altitude not fitting the “butterfly” pattern of spots during a solar cycle, and therefore it was a Cycle 24 spot. Never the less, the reverse polarization will be the hallmark of cycle 25 spots. The highest Daily Active Region Area for the rotation was 130 millionths and the total spot count for the rotation was 11 for a Wolf number of 31, both which happened on 8/26. The Sun’s flare activity also increased a bit compared to the previous very inactive rotation. During the rotation, the sun produced a total of 5 A-class flares and 11 B-class flares, of which 9 happened on 8/25. Overall, Solar Activity remained Very Low and the rotation ended with Spotless Day 276.

This time we would like to feature some images submitted by three of our observers, Frank Melilo, Howard Eskildsen, and Christian Viladrich. Please click the thumbnails below to see the full resolution. Thanks to them, as well as all other contributors for another great rotation. Please take a look at all the submitted drawings/images by clicking on the link above which links to our archive for CR2207.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

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