2018 April 21 Sun - AR12706 and AR12707

各類觀測太陽的儀器介紹及太陽攝影 Solarmax
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2018 April 21 Sun - AR12706 and AR12707

文章 PTS » 週日 22 4月, 2018 12:17

2018 April 21 Sun - AR12706 and AR12707

AR12706 has developed into a large and very active AR over the past couple of days.
AR12706 is a bipolar group with a large complex sunspot in the leading (west) side, and many small sunspots.
A strong chain of flares show up near the following sunspots, and an active ejection in the form of a jet shows up from the NE of the leading sunspot. This jet is visible even in pseudo-white light.
AR12707 is a minor AR to the SW of AR12706. This AR shows many filaments.

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: 17242
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

Re: 2018 April 21 Sun - AR12706 and AR12707

文章 PTS » 週日 22 4月, 2018 12:18

more images
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AR12706-04_02_44Z_cr.jpg
AR12706-04_02_44Z_cr.jpg (81.17 KiB) 已瀏覽 192 次
AR12706-07-03_43_51Z.jpg
AR12706-07-03_43_51Z.jpg (291.54 KiB) 已瀏覽 192 次
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AR12706-07-03_46_02Z.jpg (260.56 KiB) 已瀏覽 192 次
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AR12706-07-03_48_38Z.jpg
AR12706-07-03_48_38Z.jpg (226.42 KiB) 已瀏覽 192 次
AR12706-07-03_48_58Z.jpg
AR12706-07-03_48_58Z.jpg (291.22 KiB) 已瀏覽 192 次

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