Solar Section        

 
 

September 14, 2020

CR 2234 Summary

By Kim Hay
Acting Assistant Coordinator

Carrington Rotation CR2234 started on 2020-08-11 1150 UT and ended on 2020-09-07 1745 UT.

On July 26th sunspot AR2270 rotated onto the Sun in the northeast and remained on the Sun until August 14th. This group produced a C2 class solar flare from the decaying sunspot.

On August 12th sunspot AR2771, which was in the southern hemisphere group of Solar Cycle 25 regions showing on NASA’s magnetic map, was visually seen on August 13th but gone by August 15th.

August 16th the Sun produced a B1 class flare in the southern hemisphere but no spots were evident.

Sunspot AR2772 showed up August 18th in the northern hemisphere producing a CME that missed Earth on Aug 20th as per NASA’s STEREO A satellite.

On August 28th the Sun produced a minor G1 class geomagnetic storm that produced Arctic auroras with solar winds of 500 km/s hitting the Earth’s atmosphere. Auroras were observed again on August 31st for five straight days.

The Sun then remained blank to the end of CR2234, reflecting very low activity with our Sun still waffling between Cycle 24 and 25.

Images & Sketches can be found on the Solar ALPO image gallery for CR2234 from the following individuals:

Theo Ramakers
Howard Eskildsen
Frank J. Melillo
Guilherme Grassmann
Paul Andrew
Monty Leventhal (sketch)
David Teske (sketch)
Tony Broxton (sketch)

 
 

September 8, 2020

A Short Summary of CR2234

By Theo Ramakers

Carrington Rotation CR2234 covered the time period from 2020-08-11 1150 UT – 2020-09-07 1745 UT.

The observations can be viewed in my Solar Archive for CR2234 which can be accessed at: http://ceastronomy.org/gallery/main.php?g2_itemId=50864

The rotation brought us 21 spotless days, with a spotless streak of 17 days. The rotation showed us 3 named Active Regions AR2770, 71 and 72. AR2770 extended from the previous rotation for another 2 days. Another region which was named AR2771 was visible concurrently with AR2770 for one day. However the new region was short lived with 2 days only. A third region AR2772 was visible for 3 days starting on 08/19/2020. The regions were very small at 10 millionths, with AR2772 being the exception by growing to 20 millionths for one day on 08/20/2020, on which day also the maximum wolf number of 24 was observed. Overall Solar Activity remained Very Low with the total Active Region Area for the rotation measuring only 90 millionths, while the rotation increased the spotless days count since solar maximum to 825 spotless days. Finally, during the period SWPC reported 2 A-class, 13 B class, and no C-class flares. The largest B-Flare, a B3.9 was observed on 08/19/2020.

Even though that solar activity is Very Low, it is also interesting to note that 14 of the last 17 named Active Regions since January 1 of this year were Cycle 25 polarized.

This time I would like to feature some images showing an unnamed, interesting feature that passed by, towards the end of the rotation.

3 Hydrogen-Alpha images of a region on Sun

 
 

September 3, 2020

Summaries for Carrington Rotations CR2228-CR2230

By Theo Ramakers

A Short Summary of CR2230

Carrington Rotation CR2230 covered the time period from 2020-04-24 1529 UT – 2020-05-21 2100 UT.

The observations can be viewed in my Solar Archive for CR2230 which can be accessed at: http://ceastronomy.org/gallery/main.php?g2_itemId=49751

The rotation brought us 21 spotless days, with a spotless streak of 20 days which was interrupted for 6 days while showing 4 Active Regions. AR2760 emerged on 4/26/2020 and lasted the entire 6 days with the exception that it disappeared for a short time on 4/29. Another region which was named AR2761 showed only for part of a day one day earlier. All regions were very small at 10 millionths, with AR2761 being the exception by increasing to 20 millionths on 4/30 and 5/1. The maximum Wolf Number of 35 was reached on 5/1 when both AR2760 and 63 were reported with 2 spots each. Overall Solar Activity remained Very Low with a Total Rotation Active Region Area of 100 millionths, while the rotation increased the spotless days count since solar maximum to 759 spotless days. Finally, during the period SWPC reported two A-class, two B class, and no C-class flares.

This time I would like to feature some combination images showing some prominences at the SW rim.

 

A Short Summary of CR2229

Carrington Rotation CR2229 covered the time period from 2020-03-28 0857 UT – 2020-04-24 1529 UT.

The observations can be viewed in my Solar Archive for CR2229 which can be accessed at: http://ceastronomy.org/gallery/main.php?g2_itemId=49494

The rotation brought us 22 spotless days with a streak of 19 days. We had one Active Region, AR2759, which emerged on 3/31/2020 and lasted for 5 days. The region’s maximum coverage was 30 millionths on April 3 and 4, when it supported 2 and respectively 3 spots. Overall Solar Activity remained Very Low and the rotation increased the spotless days count since solar maximum to 738 spotless days. Finally, during the period SWPC reported three A-class, seven B class and no C-class flares.

At this time, I would like to feature some combination images showing AR2759 in three different wavelengths on three different days.

 

A Short Summary of CR2228

Carrington Rotation CR2228 covered the time period from 2020-03-01 0126 UT – 2020-03-28 0857 UT.

For two days on March 9th and the 10th, the rotation did bring a new active region AR2758. On March 9th as an Hrx, and 10th as a Cro area, however, its size did not exceed 20 millionths.  I did not have the time to keep up with the Reverse Polarized Areas during this rotation, but will catch up for the next summary with a new reverse polarized area report. On March 28rd the current spotless streak stands at 18 spotless days.   Overall Solar Activity remained Very Low and the rotation increased the spotless days count since solar maximum to 716 days. Finally, during the period SWPC reported three A-class, one B class and no C-class flares.

 
 

April 25, 2020

Carrington Rotations Commencement Date/Times for CR 2159-2306

A page with the dates & times of Carrington Rotations CR 2159 to 2306 (JAN 2015 thru DEC 2025) as calculated by Jeff Beish are now available using the page link on the right or using this link.

Clear Skies,
Rik Hill

 
 

March 3, 2020

A Short Summary of CR2227

Carrington Rotation CR2227 covered the time period from 2020-02-02 1721 UT – 2020-03-01 0126 UT.
At the time of this writing 118 images were submitted for the archives, which is about 100 less than for the previous rotation, and is a result of being around solar minimum and the bad weather conditions. The submissions can be viewed in ALPO’s Solar Archive for CR2227 which can be accessed at:
http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2227
The rotation did not bring us any new active regions, however, on the fist day AR2757 turned to the far side of the Sun. We noticed some small areas of which a few were reverse polarized, which did not create any Sunspots, . See our overview (pdf) of the Reverse Polarized Areas, by clicking here. On March 3rd. the spotless streak stands at 28 spotless days which gives this solar minimum 6 streaks of 28 days or higher, whereas the previous solar minimum gave us only 3. However, these 3 spotless streaks were much longer than what we have seen so far. Overall Solar Activity remained Very Low and the rotation increased the spotless days count since solar maximum to 690. Finally, during the period SWPC reported 3 A-class, and no B- or C-class flares.
This time we would like to feature 3 images submitted by Howard Eskildsen, Theo Ramakers and Guilherme Grassman. Thanks to these and all other observers for submitting their observations Please click the thumbnails below to see the full images in the archive.

http://www.alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2227/2020-02-07-1849-GG-Ha

http://www.alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2227/2020-02-08-1703-HE-HA

http://www.alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2227/2020-02-09-1735_0-TR-Ha-SWFilaprom

Clear Skies,
Theo Ramakers

 
 

February 3, 2020

A Short Summary of Carrington Rotation 2226

Carrington Rotation CR2226 covered the time period from 2020-01-06 0911 UT – 2020-02-02 1721 UT.
At the time of this writing 207 images were submitted for the archives. The submissions can be viewed in ALPO’s Solar Archive for CR2226 which can be accessed at:
http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2019/CR2226
The rotation brought us three active regions, AR2755, AR2756 and AR2757, of which one was reversed polarized. In addition to this AR, we had additional reversed polarized areas which lasted days, or just a few hours. AR2757, a cycle 24 area, finally brought an Active Region Area again with a size of 100 millionths, while it was reported as an Hsx area. The last time we saw an area over 100 millionths was AR2745 on May 19, 2019. The highest Wolf number was 18 on January 27th, and the Total Rotation Active Region Area was at 430 millionth. Overall Solar Activity remained Very Low and the rotation increased the spotless days count since solar maximum to 662. Finally, during the period SWPC reported 2 A-class, 5 B-class, and no C-class flares.

This time we would like to feature 3 images submitted by Howard Eskildsen, Theo Ramakers and Jeffrey Carels. Thanks to these and all other observers for submitting their observations Please click the thumbnails below to see the full images in the archive.

http://www.alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2226/2020-01-25-1542-HE-CaK

http://www.alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2226/2020-01-06-1458_7-TR-Ha-AR2755

http://www.alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2020/CR2226/2020-01-26-11-31-JC-AR12757

Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

 
 

August 30, 2015

Carrington Rotation Dates released August 30, 2015

Good Morning,

Jeff Beish has supplied the Solar Section with Carrington Rotations dates from CR2092 to CR3082.
These are now availale in pdf download on the Solarblog site under A.L.P.O. SOLAR SECTION EPHEMERIDES page.

Brad Timmerson also supplied a Decimal Date file for CR2166 to CR2230 and is also available on A.L.P.O. SOLAR SECTION EPHEMERIDES page.

Kim Hay
A.L.P.O.Solar Section Co-ordinator

 
 

July 24, 2015

Carrington Rotation Dates released August 30, 2015

Carrrington Rotation CR2163 click on CR2163. This has been uploaded to the Solar Section.

There were three observers with 23 submitted images.

Kim Hay
ALPO Solar Section Coordinator

 
 

June 28, 2015

Carrington Rotation Dates for CR2166

Title: CR2166
Description: CR2166 begins
Start Date: 2015-07-15
End Date: 2015-08-11

 
 

June 28, 2015

Carrington Rotation Dates for CR2165

Title: CR2165
Description: CR2165 begins
Start Date: 2015-06-18
End Date: 2015-07-14

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