Reports « Solar Section

July 10, 2016

A short Summary of Carrington Rotation 2178

Carrington Rotation 2178 covered the time period from 2016-06-06 – 0557 UT until 2016-07-03 – 1040 UT.
Submitted observations can be viewed in ALPO’s Solar Archive for CR2178:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=83716

CR2178 was the first rotation since the solar maximum that started with no reported Active Region and ended with no regions during the last 10 days. In fact only during 16 days, the Sun’s activity showed ARs and Sunspots. The total number of regions that could be observed was limited to 7. The largest Region AR2553 reached its maximum size at 330 millionths only three days after it emerged from the Eastern Limb, while the Sun’s total active regions maxed out the same day at 500 millionths. The largest number of Sunspots (12) were counted when AR2552 was the only region three days before.

Despite the low activity during the rotation, observers did submit 401 observations to the ALPO Solar archive. Thanks to all who observed the Sun for their dedication. Following are a few observations submitted by Dave Tyler, Howard Eskildsen and Theo Ramakers, including an “empty” Sun, but all submitted observations can be seen by following the link above.

Your Solar Section Team

June 17, 2016

ALPOSS – A report on CR2169 thru CR2173

ALPOSS’ Acting Coordinator and Scientific Advisor Richard Hill continues his detailed reports of the Carrington Rotations. This time he covers 5 Carrington Rotations: CR2169 thru CR2173. The reports are based on over 500 submissions of numerous contributors to the Solar Observations Archive. The report was published in the 2016 Summer issue of the JAPLO and can now also be accessed as a stand alone document on ALPOSS’ Solar Observations & Reports page, or downloading by “right”clicking on the picture below.

June 7, 2016

A short Summary of Carrington Rotation 2177

Carrington Rotation 2177 covered the time period from 2016-05-10 – 0053 UT until 2016-06-06 – 0557 UT
Submitted observations can be viewed in ALPO’s Solar Archive for CR2177:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=82541
11 Active regions could be observed during the period, which started with four active regions, an active region area total of 210 millionths, as well as 28 sunspots. The largest region was AR2546 which reached its maximum of 540 millionths on May 17th. The shortest lived Active Region was AR2547 with a duration of two days only and did not grow larger than 10 millionths. The active region total for the solar disk maxed out on May 16th at 770 millionths, one day before AR2546 reached its maximum. The highest number of Sunspots (37) could be observed on May 15th.

The last 7 days of the Rotation the Sun did not produce any C-class flares, and the last 5 days even went without any B-Class flares, resulting in an overall Very Low solar activity. To top it off, the Rotation ended with three days of no registered active regions or sunspots, a clear indication that we are on the way to the Solar minimum. At the end of the Rotation, observers had submitted 273 observations to the ALPO Solar archive. Thanks to all who observed the Sun for their dedication. Following are a few observations submitted by Tony Broxton, Avani Soares, and Monty Leventhal, but all submitted observations can be seen by following the link above.
The ALPO Solar Team.

May 20, 2016

Carrington Rotation 2176, a short summary

The Rotation ran from 2016-04-12 1857 UT till 2016-05-10 0053 UT.
Submitted images can be viewed at the following URL:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=81501
15 Active Regions could be observed during the rotation (AR2529 – AR2543). The rotation started with a total active region area of 880 millionths and 22 sunspots and ended with a total active region area of 210 and 28 spots. The largest region in the previous rotation, AR2529, continued to be the dominant region for this rotation too, and maxed out with an area of 850 millionths. The lowest total area was recorded on April 23rd with 70 millionths. It has been a while since the Sun produced a flare larger than a M5, However early morning 4/18 marks the day/time when it produced an M6.7 flare which did cause an R2 alert to be posted. The highest Wolf Number (86) was recorded for 4/28 with 6 regions and AR2535 showing 9 spots by itself, and the lowest Wolf Number (11) on 4/24 when only region AR2433 was observed with only one sunspot.

The last day of the rotation showed a special event, the Mercury transit which was the subject of the previous summary. The archive received over 380 submissions for the rotation, with an additional 40 for the Mercury transit.
Thanks to all who spend their time observing the Sun, and submitting their observations.
The ALPO- Solar team.

May 14, 2016

The Mercury Transit, a short summary

As of this writing the ALPO Solar Section received 26 submissions of observations of the Mercury Transit. The transit was well advertised in the JALPO and Solar blog through John Westfall’s article about the transit. In order to accommodate the request to provide a number of images taken exactly at the full hour, a number of submissions were filed which were taken to the second at XX.00 .00 UT. It is our understanding that some of these images have been used by individuals to re-calculate the distance between the Earth and the Sun ( 1 AU). In addition several composite images showed the planet as it tracked in front of the sun and during ingress and egress. Take a look at the archive to see what was submitted:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=82053
We’d like to thank all that took the time to observe this event and submit their observations.
The ALPO Solar team.

April 16, 2016

Carrington Rotation 2175, a short summary

Carrington Rotation CR2175 ran from 2016/03/16 11:58 UT until 2016-04-12 18:57 UT.
Submitted images and observations are archived here:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=80774
The rotation started with a total Active Region Area size of 140 millionths and a Wolf Number of 59. It ended with a total region size of 880 millionths, and a Wolf Number of 42. During the period, the Sun showed 11 Active Regions (AR2519 & AR2521 – AR2530) and it looked for a while that AR2524 would be the dominant region, until four days before the end of the rotation, when AR2529 came around the Eastern limb. The rotation maxed out as it finished on April 12th, when AR2529 had grown to a size of 850 millionths. However, AR2524 still managed to be a key contributor to the highest Wolf number of the rotation of 66 (5 regions and 16 spots) on March 18th. The largest flare, a C3.7, was produced by AR2521 on March 20th, just when it was getting ready to turn to the far side of the Sun.
We are showing three images below which were captured close to the key dates mentioned above. The images were submitted truly by a number of international contributors: Guilherme Grassmann from Brazil, David Tyler from the UK, and Gabriel Corban from Rumania.
As of this writing, ALPO received 226 observations/images for the rotation, and we like to thank all that took the time to submit their images/observations.
The ALPO Team.

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