Solar Section        

 
 

March 23, 2018

A Short Summary of Carrington Rotation 2198

Carrington Rotation 2198 covered the time period from 2017-12-03 1441 UT – 2017-12-30 2231 UT .
162 Submissions were added to ALPO’s Solar archive at the time of this writing. The submissions can be viewed in ALPO’s Solar Archive for CR2198:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2198

As in the previous rotation, we could observe 3 Active Regions AR2690-AR2691. AR2690, just a little more than a pore, was visible on 12/7 and 12/8. AR2691 made it one day longer, and was visible for three days from 12/11 till 12/13. AR2691 was visible for 8 days and grew to a size of 160 millionths and 12 spots on 12/25, while it produced 10 B-class flares on 12/22 and 23. Active Regions were visible on 13 days, and 14 days were spot less, bringing the spotless days since solar Max at the end of the rotation to 137. The highest Wolf Number of 22 was recorded on 12/24 and 25. The highest total Active Region Area for the day of 160 millionths was recorded on 12/25. This rotation showed a little more activity with a Total Active Region Area for the Rotation of 650 millionths than the previous one.

For this rotation we would like to feature three images by three of our observers, Raffaello Braga, Guilherme Grassmann, and Theo Ramakers. Thanks to them, as well as all other contributors for another great rotation. Please take a look at all the drawings/images by clicking on the link above which links to our archive for CR2198.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

 
 

December 11, 2017

A Short Summary of Carrington Rotation 2197

Carrington Rotation 2197 covered the time period from 2017-11-06 0713 UT – 2017-12-03 1441 UT.
286 Submissions were added to ALPO’s Solar archive at the time of this writing. The submissions can be viewed in ALPO’s Solar Archive for CR2197: http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2197
During the rotation, we could observe 3 Active Regions AR2687-AR2689 of which AR2688, which was very small, was only visible for one day. The duration of the 2 other active regions was substantial shorter than the Active Regions during the previous rotation with 5 resp. 6 days. Active Regions were visible on 11 days, and 16 days were spot less, bringing the spotless days since solar Max. to 123. The highest Wolf Number of 26 was recorded on 11/18, the day that AR2688 was visible in addition to AR2687. The highest total Active Region Area for the day of 90 millionths was recorded on 11/16 and 11/17. The largest region for the rotation was AR2685 covering an area of 70 millionths on 10/23. This was so far the least active region since Solar Maximum with the Total Active Region Areas for the rotation of 540 millionths and 16 spotless days. The last full day of the rotation was spotless, for spotless day 123 since Solar Max.

For this rotation we would like to feature three images by three of our observers, Theo Ramakers, Howard Eskildsen, and John ONeal. Thanks to them, as well as all other contributors for another great rotation. Please take a look at all the drawings/images by clicking on the link above which links to our archive for CR2197.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

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November 30, 2017

A Short Summary of Carrington Rotation 2196

Carrington Rotation 2196 covered the time period from 2017-10-10 0008 UT – 2017-11-06 0713 UT.
261 Submissions were added to ALPO’s Solar archive at the time of this summary despite the very low solar activity. The submissions can be viewed in ALPO’s Solar Archive for CR2196:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2196

During the rotation, we could observe 3 Active Regions AR2684-AR2686 of which AR2684 was only visible for one day. The highest Wolf Number of 23 was recorded on five days, 10/24 and 10/25, 10/27 and 10/28 and 10/30 while the highest total Active Region Area for the day of 90 millionths was recorded on 10/24 and 10/25th. The largest region for the rotation was AR2685 covering an area of 70 millionths on 10/23. This was so far the least active region since Solar Maximum with the Total Active Region Areas for the rotation of 540 millionths and 16 spotless days. The last full day of the rotation was spotless, for spotless day 107.

For this Rotation we would like to feature three observation drawings 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 all drawings/images by clicking on the link above linking to our archive for CR2196.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

 
 

November 23, 2018

ALPOSS – A report on Carrington Rotation CR2188 through CR2190

ALPOSS Coordinator and Scientific Advisor Richard Hill continues his papers covering the analysis of the activity of the Sun’s Carrington Rotations with a report on: CR2188 thru CR2190. This covers the period from March 6th, 2017 until May 26th, 2017. The reports are based on over 1200 reports and image submissions of numerous contributors to the Solar Observations Archive. The report was published in the 2017 Autumn issue of the ALPO Journal, the Strolling Astronomer, and can now also be accessed as a stand alone document on ALPOSS Solar Observations & Reports page, or downloading it by “right” clicking on the picture below.

 
 

November 5, 2017

A Short Summary of Carrington Rotation 2195

Carrington Rotation 2195 covered the time period from 2017-09-12 1729 UT – 2017-10-10 0008 UT.
510 Submissions were added to ALPO’s Solar archive at the time of this summary. Stimulated by the previous very active rotation, more images were submitted for this rotation than the previous one. They can be viewed in ALPO’s Solar Archive for CR2195:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2195

During the rotation, we could observe 5 Active Regions AR2680-AR2683 and AR2674, which was visible only for one last day before it did rotate to the far side. The highest Wolf Number of 40 was recorded on two days, 9/27 and 9/29, while the highest total Active Region Area for the day of 560 millionths was recorded on 9/26. The largest region for the rotation was AR2683 covering an area of 330 millionths on 10/4. The last full day of the rotation was spotless again for spotless day 92.

For this Rotation we would like to feature three observations/images by three of our observers, Guilherme Grassman , David Teske, and Theo Ramakers 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 CR2195.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

 
 

September 16, 2017

A short Summary of Carrington Rotation 2194

Carrington Rotation 2194 covered the time period from 2017-08-16 1126 UT – 2017-09-12 1729 UT.
488 Submissions were added to ALPO’s Solar archive at the time of this summary, while the activity of the Sun dramatically increased. They can be viewed in ALPO’s Solar Archive for CR2194:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2194

The rotation started with one active region covering an area of 170 millionths and a Wolf Number of 21, and ended with two regions covering 420 millionths and a Wolf Number of 38. The Total Active Region Area, during the rotation was a whopping 12 times that of the previous rotation. This was mainly due to a burst of activity during a seven day period in which the Sun produced 7 flares, which caused R2 alerts to be issued. In addition to 3 flares larger than an M5.0, four X-class flares were detected, an X2.2 and X9.3 on 9/6, an X1.3 on 9/7, and finally an X8.2 on 9/10. The X9.3 flare is the largest flare since I started recording high solar activity almost four years ago, and possibly the largest of the current cycle. Noteworthy here is that we have not had an R2 triggering flare in 5 months, but have had 91 spotless days already since Solar Maximum. During the rotation we could observe 10 regions AR2671 – AR2680, of which AR2679 lasted only two days. The rotation started relative quiet for its first half but then activity increased rapidly with AR2673 and AR2674. AR2673 covered the largest Active Region Area on 9/9 with 1060 millionths, which also coincides with the largest Total Active Region Area for the Sun of the rotation with 1760 millionths. The highest Wolf number 122 was shared on two days 9/5 and 9/6. There were no spotless days during CR2194.
For this Rotation we would like to feature three images by three of our observers, Mike Borman, Christian Viladrich, and a composite by Guilherme Grassman, who managed to capture part of the X9.3 flare on 9/6. 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 CR2194.
Clear Skies,
Theo Ramakers
Acting Assistant Coordinator, the ALPOSS

 
 

September 14, 2017

ALPOSS – A report on Carrington Rotation CR2184 through CR2187

The next article on Solar Activity by ALPOSS Coordinator and Scientific Advisor Richard Hill covers his analysis of the activity of the Carrington Rotations: CR2184 thru CR2187, or November 16th 2016 through March 6th, 2017. The reports are based on 1200 reports and image submissions of numerous contributors to the Solar Observations Archive. The report was published in the 2017 Summer issue of the ALPO Journal, the Strolling Astronomer, and can now also be accessed as a stand alone document on ALPOSS Solar Observations & Reports page, or downloading it by “right” clicking on the picture below.

 
 

September 12, 2017

ALPOSS – A report on CR2180 through CR2183

We are continuing to post here the reports written by ALPOSS Coordinator and Scientific Advisor Richard Hill. This post contains his analysis of the solar activity of the Carrington Rotations: CR2180 through CR2183, or July 30th through November 16th, 2016. The reports are based on 1933 reports and image submissions of numerous contributors to the Solar Observations Archive. The report was published in the 2017 Spring issue of the ALPO Journal, the Strolling Astronomer, and can now also be accessed as a stand alone document on ALPOSS Solar Observations & Reports page, or downloading it by “right”clicking on the picture below.

 
 

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://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2193

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://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2192

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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