香港天文論壇

more

2021 January 19 Sun - prominences on the NW solar limb Most of this quiescent prominences is on the backside, leaving just the tips. Sunspot count: group=1, sunspots=4, R=14 For H-alpha images: Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow Camera : ASI174MM and ASI174MC exposure: 25.0...

More

Images of AR12797

2021 January 19 Sun - solar surface in H-alpha with AR12796 and AR12797 AR12796 is still active with flares and filaments. All sunspots are gone. AR12797 is active with flares on the solar limb. The large leading sunspots as well as the tiny following ones are visible. There is a huge filament runni...

Images of AR12797

2021 January 19 Sun - solar surface in Ca-K, with AR12796 and AR12797 AR12796 is still active with flares and filaments that are visible in Ca-K. However, the sunspots are gone. AR12797 is active with flares on the solar limb. The large leading sunspots as well as the tiny following ones are visible...

2021 January 19 Sun - a demonstration of bad seeing, with AR12797 This animation is compiled from 123 frames taken from 01:32:27.86 UTC to 01:32:29.33 UTC Telescope: Celestron C5, 127mm f/10 Schmidt-Cassegrain Camera : ASI1600MM Pro, not cooled. focal length : 1250 mm f/10 Filters: Baader Solar Film...

2021 January 19 Sun - solar surface in white-light, with AR12796 and AR12797 After studying the satellite cloud images, I started early so as to complete my observation before the clouds from south arrive. Seeing is terrible at the start of observation, but improves a bit after 02:30 UTC. AR12796 is...

Images in H-alpha

2021 January 18 Sun - prominences on the NW solar limb This quiescent prominences has undergone substantial changes since yesterday. Sunspot count: group=1, sunspots=4, R=14 For H-alpha images: Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow Camera : ASI174MM and ASI174MC exposure: 25.0...

more

2021 January 18 Sun - prominences on the NE solar limb Sunspot count: group=1, sunspots=4, R=14 For H-alpha images: Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow Camera : ASI174MM and ASI174MC exposure: 25.0 ms (monochrome), 25.0 ms (colour) For Ca-K images: Telescope: Sharpstar AL-80...

more

2021 January 18 Sun - prominences on the SE solar limb Sunspot count: group=1, sunspots=4, R=14 For H-alpha images: Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow Camera : ASI174MM and ASI174MC exposure: 25.0 ms (monochrome), 25.0 ms (colour) For Ca-K images: Telescope: Sharpstar AL-80...