Solar Section        

 
 

A short Summary of Carrington Rotation 2183


Carrington Rotation 2183 covered the time period from 2016-10-20 1024 UT until 2016-11-16 1739 UT.
367 Reports and images were submitted for our archive and can be viewed in ALPO’s Solar Archive for CR2183:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=91802
During the rotation, 9 Active Regions could be observed. The largest region, AR2607, reached its maximum area of only 100 millionths on November 12th. This is far smaller than the largest area in the previous rotation, and it is also the date where the total area for the Sun maxed out for the rotation at 120 millionths. The Wolf number reached its maximum one day later on November 13th when three regions were visible on the hemisphere for a Wolf number of 38. Carrington Rotation CR2183 showed again a quiet time for the Sun as it did have two days, November 3rd and November 9th, where the total active region area as well as the Wolf number were 0.
We thank all of those who did submit their data and continued their effort to record the solar activity over the years.
For this Rotation we are featuring three random images from our observers. Thanks to them as well as all other contributors for a great rotation. Please take a look at all their submission in our archive, by clicking the link above.

The ALPO Solar Team.

 
 

November 2, 2016

A short Summary of Carrington Rotation 2182


Carrington Rotation 2182 covered the time period from 2016-09-23 0334 UT until 2016-10-20 1024 UT.
610 Reports and images were submitted and all can be viewed in ALPO’s Solar Archive for CR2182:

http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=89942

A total of 8 Active Regions could be observed during the rotation, AR2593 and AR2596 thru 2602. This is less than half of the previous rotation. We had one day without a reported active region during the rotation on October 2nd. The largest region AR2599, maxed out with a region area of 470 millionths on October 6th. The highest “Total Daily Active Region Area” for the hemisphere was recorded on October 10th with 630 millionths with AR2599 being the dominant contributor with 400 millionths. The highest Wolf number of 64 was recorded on October 11th. The “total active region area” for AR2599 (sum of the daily active region area of an active region for the period the region was visible) is only 71% of the largest region during the previous rotation.
Below we feature images of October 6th and 11th of three of our contributors: Dave Tyler, David Teske and Guilherme Grassman. However, we would like to thank all that contributed to our archive and please take a look at them by clicking on the link above.
Your Solar Team

 
 

October 19, 2016

A short Summary of Carrington Rotation 2181


Carrington Rotation 2181 covered the time period from 2016-08-26 2116 UT until 2016-09-23 0334 UT.
481 Reports and images were submitted and can be viewed in ALPO’s Solar Archive for CR2181:

http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=88450

During the rotation, 18 Active Regions could be observed with the largest region, AR2585, reaching its max. area of 590 millionths on September 4th, . This is more than twice that of the active region area covered by the largest AR in the previous rotation, which reached a max. of 290 millionth on August 10th. The total active region area for the hemisphere maxed out two days earlier on September 2nd with 730 millionths and the Wolf number reached its maximum on September 1st with 91. As mentioned, the dominant region during the rotations was AR2585. Unlike the previous four rotation, CR2181 did not have any days with a total active region area of 0 or a Wolf number of 0.
We thank all of those who did submit their data and continued their effort to record the solar activity over the years.
For this Rotation we are featuring three images from our observers Rik Hill, Michael Borman and Randy Tatum. Thanks to them as well as all other contributors for a great rotation. Please take a look at their images in our archive.

The ALPO Solar Team.

 
 

October 3, 2016

A short Summary of Carrington Rotation 2180

Carrington Rotation 2180 covered the time period from 2016-07-30 1539 UT until 2016-08-26 2116 UT.
All 426 submitted observations and images can be viewed in ALPO’s Solar Archive for CR2180:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=86911
12 Active Regions could be observed during this rotation with the largest region, AR2574, reaching the largest Active Region Area for the royation of 290 millionth on August 10th. In addition, the Rotation showed two Regions which exceeded an area of over 200 millionths, AR2571 and AR2574. The total Active Region Area for the hemisphere maxed out on August 9 at 490 millionths, which coincided with the highest spot count for the rotation of 31 and a Wolf number of 91. The previous rotations, CR2178 and CR2179 had respectively 11 and 5 days without active regions, and CR2180 continued this pattern with another 5 days without any Active Regions.
We thank all of those who did submit their data and their continued effort to record the solar activity over the years.
This Rotation we are featuring three images from our observers, Dave Tyler, Jamey Jenkins and Chris Schur. Thanks to them as well as all other contributors for a great rotation. Please take a look at their images in our archive.

The ALPO Solar Team.

 
 

September 27, 2016

ALPOSS – A report on CR2174 thru CR2177


ALPOSS Coordinator and Scientific Advisor Richard Hill continues his analysis of the solar activity in his detailed reports of the Carrington Rotations. This time he covers 4 Carrington Rotations: CR2174 thru CR2177, or February 18th through June 6th, 2016. The reports are based on almost 1200 reports and image submissions of numerous contributors to the Solar Observations Archive. The report was published in the 2016 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.

 

 
 

August 16, 2016

A short Summary of Carrington Rotation 2179

Carrington Rotation 2179 covered the time period from 2016-07-03 – 1040 UT until 2016-07-30 – 1539 UT.
Submitted observations can be viewed in ALPO’s Solar Archive for CR2179:
http://www.alpo-astronomy.org/gallery/main.php?g2_itemId=84861
12 Active Regions could be observed during this rotation with the largest region, AR2567, reaching a covered area of 390 millionth on July 20th. The total area maxed out on July 21st at 790 millionths. The largest Spot count of 28 was observed on July 19th with AR2575 and AR2567 being the main contributors to this. Whereas the previous rotation CR2178 had 11 days with no regions, CR2179 had 5 days without any Active Regions.
A total of 482 submissions were made by Solar Observers and we thank all of them for their continued effort to record the solar activity over the years.
Instead of featuring three images in this blog, this time we would like to show three of the reports logged by our contributors Joe Gianninoto, Ryc Rienks, and David Teske. Thanks to them as well as all other contributors for a great rotation.

The ALPO  Solar Team.

 
 

July 18, 2016

Scanning Recommendation for Solar Drawings

Recent questions about what format drawings should be in when submitted to the Solar Archive, prompt us to write this post. Despite that many say that they want the highest quality and thus scans should be submitted in the highest possible resolution, this does not make a lot of sense. Drawings are made typically by pencil or a marker. In addition, the drawing should as accurately reflect what someone saw and document this accordingly. Think of it as this way: If you scan at 200 dpi (dots per inch) this means that the scanner will create a dot if it finds a line that is 1/200 of an inch or 1/8 of 1mm. So the question becomes can you draw features on a Solar disc and accurately position it to that scale? Without any further aid probably not. In addition, images are mostly available in the jpg format. This standard format allows a compression grade of 1 to 12 for the file data in the image, so the file becomes smaller in size. A full 8 1/2 by 11 sheet could take up 7 MB or larger when uncompressed, but compressed it might be only 250 – 300 kB. This is a huge difference if images need to be downloaded or processed.

So let’s take a look at how a PC does display images and data. A typical PC monitor is approx. 1250 pixels wide. Some are wider and others have less pixels available. So if you were to display the width of an 8 ½ x 11” paper across the width of the screen you would have 1250 pixels available and the screen is probably 13 to 15 inch wide. This would mean that if the page was displayed across the width of the entire screen, it displays at approx. 1 ½ times the size of the real sheet of paper and it would be displayed at a resolution of 1250/8 ½ or approx. 150 pixels per inch. This would be the optimum resolution for that screen to display that page. Images captured with the current technology also have a similar resolution of 1200 -1800 pixels wide. So increasing the resolution only makes the image bigger resulting in only a portion of that image being displayed on the screen and does not necessarily increase the clearness of what you did draw.

We have taken a good look at what the best format for our purpose is, and we have concluded the following: A scan with 150 to 200 dpi produces sufficient data to properly represent what’s on the paper you scanned for analysis, as well as reproduction in printed form. In addition, when the image is saved in the form of a jpg, a compression grade of 5 to 6 for the data compression, retains more than sufficient data to properly reconstruct what was scanned. This compression grade number is displayed in many programs when the file is saved as a jpg file, including Photoshop CS or PS Elements. So to summarize, for images to be submitted in our archive we prefer if you can scan drawings as follows:

Scan with 150 to 200 dpi.
Use jpg compression grade at 5 to 6 when saving the file.

This should produce files of reasonable size for on-line access. Remember, there are still many individuals who like to see your images, but they also have to deal with slow internet, or even dial up speeds.
Thanks for your consideration, and if you have any further questions or suggestions, please do not hesitate to send your question/suggestion to solarimages@alpo-astronomy.org .
Clear Skies,
The Solar Team.

 
 

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.

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