Solar Section        

 
 

December 7, 2018

A Short Summary of Carrington Rotation 2210

Carrington Rotation 2210 covered the time period from 2018-10-26 2051 UT – 2018-11-23 0411 UT.
At the time of this writing 263 Images/Observations were submitted for CR2210. All submissions can be viewed in:
ALPO’s Solar Archive for CR2210: http://alpo-astronomy.org/gallery3/index.php/Solar-Observations-Archive/SolarImages2018/CR2210
The rotation was mostly spotless while accumulating 19 spotless days, but had two named active regions, AR2726 which lasted three days, and AR2727 with 5 days. The highest Daily Active Region Area for the rotation was 60 millionths on November 18 and 19 during AR2727. The highest Wolf number for the rotation was 14 on November 17 and 19. During the rotation, two areas showing Cycle 25 polarization could be seen in SDO’s magnetogram in the higher Northern latitudes. The first one from November 8th through 10th. The second for a number of hours on November 17th. Based on its naming requirements, SWPC did not name either of these areas, but SILSO took exception and did count them as spots. During the rotation, the sun produced a total of 6 A-class flares of which the largest was an A 5.3 class flare. Overall Solar Activity remained Very Low and the rotation ended with Spotless Day 335.
At this point I would like to clarify some statistics. Several organizations keep records of sunspots and the Sunspot Number. ALPO-Astronomy does not. My research, which I cite in these short reviews, contains data derived from published data from SWPC, which is a division of NOAA. This division is responsible for naming Active Regions (numbering). SILSO and the Solar-Terrestrial Center for Excellence are organizations tasked with the creation and dissemination of the Sunspot Number. They are connected to the Royal Observatory in Brussels Belgium. In addition, several other and country based organizations maintain their local Sunspot Numbers. Since I use other data than the Wolf Number such as active region areas and flares, I base my statistics on the raw data supplied by SWPC daily. One of them is their SRS reports which are published daily at 0030 UT. This is the reason why my sunspot related statistics may differ from others cited elsewhere.
This time we would like to feature some images submitted by three of our observers Guilherme Grassman, Howard Eskildsen with the November 8th Cycle 25 spot, and Theo Ramakers with the November 17th Cycle 25 area in Ha. Please click the thumbnails below to see the full images. Thanks all contributors for another great rotation. Please take a look at all the drawings/images by clicking on the link above which will bring you to our archive for CR2210.
Clear Skies,
Theo Ramakers
Assistant Coordinator, the ALPOSS

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