Solar Section        


May 3, 2016

The Mercury Transit, a call for image submissions

Well, it is less than a week until the Mercury transit, and a group of individuals is looking forward to try, based on the parallax shown in images of the transit at the same time, when made from different locations from Earth, to calculate the distance between the Sun and Earth. In order for this to be successful they will need images made at the same time and know the exact coordinates of the location on Earth where the image was made. We are suggesting to not only submit your images of the transit, but if possible also an image of the full sun at exactly the full hour (if possible to the second because Mercury as well as the parallax are very small), so these enthusiasts will have data they can use. If you make an avi, please use the center time of the avi.

In addition, the ALPO’s Transit section will use the data for an extensive report to be published at a future date in the Stolling Astronomer, the Journal of the Association of Lunar and Planetary Observers (the ALPO).

We hope that Solar imagers will consider this request, and submit all their images (also partial Sun images and close ups) attached to an email with the exact time and coordinates of the location addressed to: .

Thank you and wishing you all Clear Skies,


February 1, 2016

Carrington Rotation 2172, a short summary

Carrington Rotation 2172 came to an end on January 21 2016. So take a look at over 100 images and observations submitted by our observers during this time period.
This rotation ran from 12/25/2015 1152 UT until 01/21/2016 1958 UT. During this time the Sun showed 16 Active regions (AR2470 to AR2487) of which the largest region became AR2173. This region grew to an Fkc on the McIntosh scale with 38 spots on 12/27, and the size of the region maxed out at 590 millionths on the same date. The region also produced the largest Flare, an M2.4, which maxed out at 00:10 UT on January 2nd.  Here the image of AR2173 on December 27th by Rik Hill and an image submitted by Monty Leventhal of the M2.4 flare on 2016-01-02 ten minutes after the maximum.





Thanks to all contributors to this Rotation: Monty Leventhal, Tony Broxton, Gabriel Corban, Dave Tyler, Rik Hill, and Theo Ramakers.

The ALPOSS Team.

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