Solar Section        

 
 

August 30, 2017

A short Summary of Carrington Rotation 2193

Carrington Rotation 2193 covered the time period from 2017-07-20 0606 UT – 2017-08-16 1126 UT.
Solar Activity decreased again, and so did the number of submissions. 281 Submissions were added to the archive at the time of this summary, and can be viewed in ALPO’s Solar Archive for CR2193:

http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=104021

The Solar activity, in terms of total active region areas, during the rotation was only approx. 1/6 of the previous rotation. During the rotation we could observe 4 regions AR2668 – AR2671, of which AR2667 lasted only one day. The rotation started with a spotless period of 10 days, interrupted for 1 day on 7/26 with a small 10 millionths’ region AR2668. Another small region AR2669 popped up for two days on 7/30 and 7/31 followed again by two spotless days on 8/1 and 8/2. That’s when AR2670 came around the Eastern limb with 160 millionths on 8/3 which was the largest daily area during the rotation. The highest Wolf number 13 was shared on three days from 8/4 to 8/6 and the total spotless day count for the cycle stands at 91. The rotation ended the first day when the region AR2671 started to come around the Eastern limb.
For this Rotation we would like to feature three images by three of our observers, Dave Tyler, Monty Leventhal, and Howard Eskildsen. 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 linking to our archive for CR2192.
Clear Skies,
Theo Ramakers

 
 

August 27, 2017

A short Summary of Carrington Rotation 2192

Carrington Rotation 2192 covered the time period from 2017-06-23 0117 UT – 2017-07-20 0606 UT.
Solar Activity increased again, and so did the number of submissions. 495 Submissions were added to the archive at the time of this summary, and can be viewed in ALPO’s Solar Archive for CR2192:

http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=102573

During the rotation we could observe 5 regions, one of which, AR2667, lasted only one day. The rotation started on 2017-06-23 with 2 Active Regions and a Wolf number of 23. The total Active Region Area was 80 millionths. The highest Wolf Number of 58 was reached on 2017-07-23, while AR2665 was the dominant Active Region. AR 2665 also claimed to be the largest Active Region area for the rotation on 7/10 with 710 millionths (a coincidence?). The rotation had a period of 3 spotless days 0n 7/4 and 7/5 as well as a single day on 7/19, bringing the total spotless days since Solar Maximum to 80. The rotation ended with a spotless Sun.
For this Rotation we would like to feature three observations by three of our observers, Tony Broxton, Monty Leventhal, and Joe Gianninoto. 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 linking to our archive for CR2192.
Clear Skies,
Theo Ramakers

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