Spaceweather.com and theskylive.com report sunspot AR2833 visible today (using telescopes with safe solar filters). It is a bit larger than Earth size. My stargazing and notes for 14-Jun from spaceweather.com reports, [ "Old sunspot AR2824 is returning after two weeks on the far side of the sun. Per tradition, it is being renumbered as AR2833. Credit: SDO/HMI” My note. On 22-May-2021, my observations of AR2824 show it was larger than Earth size then too. It still looks larger than Earth size today.] I enjoyed viewing this larger sunspot active region again on 18-June. Today I may need to make another observation to celebrate the arrival of the summer solstice
From my observation log for the 18th of June.
[Observed 0900-0940 EDT/1300-1340 UT. "Daily Sun: 18 Jun 21, Sunspot AR2833 remains stable and quiet. Strong solar flares are unlikely today. Credit: SDO/HMI” I viewed using 19-mm WF eyepiece with glass, white light solar filter and Celestron #12 Yellow filter. The Sun’s distance near 1.016 au. At 53x, the telescope view resolved ~ 4200 km diameter on the Sun, 5.7 arcsecond angular size. Earth size ~ 17.3 arcsecond. AR2833 is larger than earth size. 1 arcminute angular size ~ 44,213 km diameter on the Sun. Sun’s angular size ~ 31.48 arcminute. Telescope FOV ~ 74 arcminute in the eyepiece. 17-year cicada loud in the trees. The scale (theskylive.com) shows AR2833 is larger than Earth size. I estimate at least 20 arcsecond size or larger. AR2833 was large dark core with lighter area around it and plage. A couple of much smaller dark areas visible too near the core of AR2833 and lighter areas surrounding AR2833.]
Happy Father's Day for the dads that read this,---Rod
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