2018 May 25 Sun - AR12712

各類觀測太陽的儀器介紹及太陽攝影 Solarmax
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註冊時間: 週日 28 10月, 2007 08:50
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2018 May 25 Sun - AR12712

文章 PTS » 週六 26 5月, 2018 08:13

2018 May 25 Sun - AR12712

1 day after turning to the front, AR12712 has developed into a very active group with strong flare activities. The leading sunspots are small while the following sunspot is much larger with many flares. A huge arena of filament surrounds the AR, and a set of filament run northwards, with one actually goes off-disc, forming a prominence.

As the slow motion is still unavailable, I have to continue with push or pull the telescope to put the image in field. This task becomes very tedious when working on close-up imaging, and I have to use very short exposures (thus high gain) to avoid blur images.

Telescope: AP Starfire EDT 155 mm f/9.
stopped to 80 mm (f/17.5) for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: ASI1600MM, 4656X3520 pixels (3.8 micron), binned 2
North is up, east is to the left.
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PTS
夸克星
文章: 6256
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

Re: 2018 May 25 Sun - AR12712

文章 PTS » 週六 26 5月, 2018 08:14

more images
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