Solar Section        


July 31, 2017

The Great American Eclipse Archive

The ALPO Solar Section has setup a folder in its archive for images made during the Great American Eclipse on August 21, 2017. The folder is a sub-folder in Carrington Rotation 2194 and can also be found at the following URL: .
Any observer who has made an image of the event, be it the total eclipse, or partial, can submit the image(s) to ALPO by emailing it to: . We are asking that the images are identified with the observer’s name, the exact time in Universal Time, and location, from where the image was taken. Staff will upload the images into the archive where they are available for analysis. Please note that the size of the images is limited to <2500 pixels wide and we prefer images in the 200k – 300kB file size. However, larger images are also accepted. We hope that many will make use of this option to document the Great American Eclipse of 2017!
The Solar Section Team.


July 17, 2017

A short Summary of Carrington Rotation 2191

Carrington Rotation 2191 covered the time period from 2017-05-26 2030 UT – 2017-06-23 0117 UT.
The rotation showed a decrease in Active Regions compared to previous rotations, and so did the number of submissions. 298 Submissions were added to the archive at the time of this summary, and can be viewed in ALPO’s Solar Archive for CR2191:

The rotation started 2017-05-26 with 1 Active Region and a Wolf number of 22. The total Active Region Area was 170 millionths. During the rotation we could observe 5 regions, AR2659 – AR2664. Please note that AR2660 was a short lived region during the previous rotation. The highest Wolf Number of 35 was reached on the last day of the rotation on 2017-06-23, while AR2659 was the largest Active Region of the rotation at the 3rd day of the rotation on 5/29 with 220 millionths. The rotation had a period of 4 spotless days from 6/10 till 6/13 as well as a single day on 5/31, bringing the total spotless days since Solar Maximum to 77. The rotation ended with three Active Regions, AR2662, 63 and 64, having a Total Active Region Area of 120 millionths and a Wolf Number of 35.

For this Rotation we would like to feature three images by three of our observers, Jon O’Neil, Randy Tatum, and Dave Tyler. 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 CR2191.
Clear Skies,
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

   Powered by WordPress     Personalized by: Larry Owens     Contact the Webmaster