Solar Section        

 
 

May 18, 2017

A short Summary of Carrington Rotation 2189

Carrington Rotation 2189 covered the time period from 2017-04-02 0848 UT – 2017-04-29 1509 UT.
The increased solar activity created an increase in the number of submitted reports and images which totaled 517 at the time of this summary, and can be viewed in ALPO’s Solar Archive for CR2189:

http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=98896

During the rotation we could observe 9 regions. The rotation started on 2017-04-02 with 4 Active Regions and a total Active Region Area of 740 millionths, and Wolf number of 79. That day the Sun produced several flares, including 2 flares which were the cause of R2 alerts. (>M5.0 flare) The 2 flares were registered as M5.3 and an M5.7, and both originated in AR2644. AR2145 continued to grow to its maximum of 700 millionths which it reached 2 days later on 2017-04-04, which coincided with the maximum Total Active Region Area of the rotation at 1270 millionths, and a max. Wolf Number for the Sun of 97. The Total Active Region Area for the rotation was interrupted briefly twice for a total of 3 spotless days, bringing the total spotless days since Solar maximum to 65. The rotation ended with a Total Active Region Area of 110 millionths and a Wolf Number of 23.

For this Rotation we would like to feature three images by three of our observers, Guilherme Grassmann, who caught the end of an M2.3 flare in AR2644 on April 2nd, Theo Ramakers, showing a WL image of AR2645 when it was at its maximum size of 700 millionths on April 4th, as well as a very nice image of a prominence by Raffaello Braga from Italy on April 3rd. 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 CR2189.
Clear Skies,
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

 
 

April 12, 2017

A short Summary of Carrington Rotation 2188

Carrington Rotation 2188 covered the time period from 2017-03-06 0126 UT – 2017-04-02 0848 UT.
328 Reports and images were submitted and can be viewed in ALPO’s Solar Archive for CR2188:

http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=98139

During the rotation we could observe 6 regions, half of which were only visible for about three days or less and two of them did not make it above 10 millionths. The rotation did start with a re-emergence of AR2141 for one day, with a size of 10 millionths, followed with a spotless streak of 15 days. The largest region, AR2645, reached its maximum area of 380 millionths on the last full day of the rotation on April 1st. This day also marks the maximum for the rotation of the Total Daily Active Region Area which was at 580 millionths while the Wolf Number maxed out at 79. The rotation did have a total of 16 spotless days, bringing the total spotless days since Solar maximum to 62.

For this Rotation we would like to feature three images by three of our observers, James Kevin Ty, David Teske, 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 above link leading to our archive.
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

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