Solar Section        

 
 

October 11, 2018

A Short Summary of Carrington Rotation 2208

Carrington Rotation 2208 covered the time period from 2018-09-02 0729 UT – 2018-09-29 1355 UT.
Image submissions decreased from 334 in the previous rotation to 231 Images/Observations. The probable cause was the reduced number of Active Regions and the large increase of spotless days. The submissions can be viewed in ALPO’s Solar Archive for CR2208:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2018/CR2208

This rotation stood out for its very low activity both in flares that were produced, as well as the low number and size of Active Regions. We had two regions of two days each. The highest Daily Active Region Area for the rotation is 10 millionths, and the highest daily spot count for the rotation was 6 for a Wolf number of 16, which happened on 9/9. We had another 23 spotless days for the rotation dropping by 2 from the previous rotation. The Sun’s flare activity decreased a bit compared to the previous rotation. During the rotation, the sun produced a total of only 4 A-class flares and 1 B-class flares. Overall Solar Activity remained Very Low and the rotation ended with Spotless Day 299.
This time we would like to feature some images submitted by two of our observers, Frank Melilo, Raffaello Braga, and graph showing the progression of Total Active Region Areas for Rotations and Number of spotless days by Rotations since 2014 (Source Theo Ramakers). Please click the thumbnails below to see the full image and graph. Thanks all contributors for another great rotation. Please take a look at all the drawings/images by clicking on the link above which will bring you to our archive for CR2208.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

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