Solar Section        

April 23, 2018

A Short Summary of Carrington Rotation 2202

Carrington Rotation 2202 covered the time period from 2018-03-22 2229 UT – 2018-04-19 0515 UT .
155 Submissions were submitted at the time of this writing. The submissions can be viewed in ALPO’s Solar Archive for CR2202:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2018/CR2202

This rotation only showed active regions for 5 days of the rotation, spread over three short periods. AR2703 and AR2704 were visible only for 2 days each and covered 10, resp. 30 millionths. AR2705 was only a one day event and covered only 10 millionths. The highest Wolf Number of 14 was recorded on April 14, which also accounted for the second day of AR2704. The rotation ended with spotless day 206 making the rotation the rotation with the highest spotless count since solar max..

For this rotation we would like to feature three observations submitted by three of our observers, Roberto Braga, Guilherme Grassmann, and Howard Eskildsen. 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 CR2202.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

March 27, 2018

A Short Summary of Carrington Rotation 2201

Carrington Rotation 2201 covered the time period from 2018-02-23 1448 UT – 2018-03-22 2229 UT .
124 Submissions were submitted at the time of this writing. The submissions can be viewed in ALPO’s Solar Archive for CR2201:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2018/CR2201

This rotation only showed active regions for 8 days of the rotation, spread over three short periods. AR2700 was only visible for 5 days relative early in the rotation and covered only 10 millionths except for the first day when it recorded 30 millionths. This region was followed late in the rotation with a one day appearance of AR2701 covering only 10 millionths and two days later AR2702 for two days covering 10 millionths. The highest Wolf Number of 16 was recorded on February 22, which also accounted for the highest Active Region Area of 30 millions. The rotation ended with spotless day 183.

For this rotation we would like to feature three observations submitted by three of our observers, Guilherme Grassmann, Howard Eskildsen, 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 CR2201.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

March 25, 2018

ALPOSS – A report on Carrington Rotation CR2195 through CR2198

This time 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: CR2195 thru CR2198. This covers the period from September 12, 2017, until December 30, 2017. The reports are based on over 1221 reports and image submissions of numerous contributors to the Solar Observations Archive. The report was published in the 2018 Winter 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.

March 24, 2018

ALPOSS – A report on Carrington Rotation CR2191 through CR2194

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: CR2191 thru CR2194. This covers the period from May 26th, 2017 until September 12, 2017. The reports are based on over 1600 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.

March 23, 2018

A Short Summary of Carrington Rotation 2200

Carrington Rotation 2200 covered the time period from 2018-01-27 0639 UT – 2018-02-23 1448 UT .
120 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 CR2200:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2018/CR2200

This rotation allowed us to see again a nice sized active region track along the visible hemisphere of the Sun from February 5th till February 17th. Active Region AR2699 increased in coverage from 80 millionths when it came around the eastern limb to 240 millionths on February 11, when 25 sunspots were recorded. Despite this, the region only produced one C-class flare, a C4.6 on February 10th. In addition, we were able to see two very small regions, AR2697 and AR2698, which each disappeared within a day. The highest Wolf Number of 35 and the highest Active Region Area for the day of 240 millionths were recorded on February 11. This was a nice rotation for a change, with a Total Rotation Active Region Area of 2160 millionths. But it ended with spotless day 163.

For this rotation we would like to feature three observations submitted by three of our observers, Dave Tyler, Howard Eskildsen, and a composite by Rik Hill. 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 CR2200.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

March 23, 2018

A Short Summary of Carrington Rotation 2199

Carrington Rotation 2199 covered the time period from 2017-12-30 2231UT – 2018-01-27 0639 UT .
106 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 CR2199:

http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2017/CR2199

During this rotation we could observe 4 Active Regions AR2692-AR2695. AR2692, visible for 4 days starting on January 5th, was replaced by AR2693 which was visible for 3 days from January 9th till January 11. AR2694 replaced AR2693 on January 12th for 1 day only. The final active region for the rotation, AR2695, was visible for 5 days and grew to a size of 30 millionths and a Wolf Number of 13 on January 17th. Active Regions were visible on 13 days, and 15 days were spot less, bringing the spotless days since solar Max at the end of the rotation to 152. The highest Wolf Number of 13 and the highest Active Region Area for the day of 30 millionths were recorded on January 17th. At 180 millionths, this rotation showed by far the lowest Total Active Regions Total for a rotation since solar max .

For this rotation we would like to feature three observations submitted by three of our observers, Monty Leventhal, Tony Broxton, and David Teske. 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 CR2199.
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.