Dynamic of Sunspot group AR3141 and AR3145

Picture of sunspot group AS3141 and AR3145 on November 11 and 12.

 

Sunspot AR3141 - CaK and White light

 

Sunspot AR3141, AR3140 and AR3145 observed on November 12, 2022. Sunspot AR3141 not only photographed in White Light but also with CaK filter.

Setting : TAL200K f/8.5, ND3.8 filter, CaK filter, ASI290mm, Barlow x2

Software : SharpCap4, AS3! (50% stacked), IMPPG, CS4

Sunspot AR3141 - Light Bridges

Some high clouds but still I was able to make some pictures of Sunspot AR3141 (and AR3140, AR3145). Sunpot AR3141 is a complex sunspot with an beta, gamma, delta configuration. 

The sunspot has also a couple of bright light bridges.

Setting: TAL200K f/8.5 with ASI290MM and ND3.8

Software: SharpCap 4.0, AS3! (25% stacked), IMPPG, DeNoise AI and CS4

Moon and Jupiter

Jupiter north of the Moon with Golden Handle.

Halo 22° and Circumzenithal Arc

Around midday, the sun was surrounded by a halo 22° and a faint circumzenithal arc.

Partial Solar eclipse Oct 25, 2022 - calculating max coverage using ImageJ

The partial solar eclipse of October 25, 2022 was tracked from Averbode. With some clouds, the conditions were less good than last year on June 10, 2021, but still sufficient.The solar eclipse was tracked with a TLAPO80/480 f/6 and Nikon D7500. A solar filter ND3.8 and OIII filter were used. A total of 127 photos were taken represesnting 3.56Gb of data. Several photos were edited and one timelapse of the process was created. You can visit my blog for this see this link .

I tried to determine the maximum of the solar eclipse as well as the time of the maximum. ImageJ software was used. To determine the surface of the sun, raw photos were uploaded and after selection via color contrast, the number of pixels that  which are not obscured are calculated. The “solidity” was also calculated. This is the result of dividing the area of ​​the eclipse by the convex area (smallest perimeter of a surface). To calibrate the time with my Nion D7500 photos, I used the time via the Frankfurt atomic clock.

I have shown in the top right corner the data for Averbode as obtained from www.timeanddate.com

Conclusion: the solidity gives much lower coverage values ​​than the pixel values. The traject of the eclipse and the calculations are influenced by the clouds on the photos. The time of the maximum is 2 minutes earlier than indicated on the website. The coverage value is 2% points higher than indicated on the website. 

A fun exercise that mainly shows the power of the ImageJ program.

ICE Software: Combining H-alpha images of the Sun

I had some difficulties to merge images using photoshop (CS4). When reading the magazine Heelal (jaargang 67, nr11, november '22 p22) I saw an article on making mozaiks using ICE (Microsoft Image Composite Editor). According to Microsoft, the software is retired and not supported any more. I took my chance and downloaded and installed the 64bit version.  

I took my solar H-alpha images from May 22 and drag them into the ICE software. The result was mindblowing. The difference with my photoshop merge is huge as you will notice yourself. 

To download the software - see this link.