The Sun today - 3 images attached
3 views
Skip to first unread message
William Bottaci
Aug 28, 2025, 12:28:21 PMAug 28
to croydo...@googlegroups.com
The Sun, once again, this time looking more like the traditional astro image.
Altitude 47.8º
Diameter 31º 40'
Distance 1.0102 AU (we're now further from the sun than average - we are closest in winter, January 3rd and furthest in summer, July 4th - so the sun's diameter is slowly getting larger. Solar eclipses in winter tend towards annular rather than full, depending on the moon's own wandering, but those in the summer last longer.)
The magnetic field of the large lower left sunspot group is complex so whilst it's likely to produce the odd energetic flare it's unlikely, for now, to result in a coronal mass ejection (CME, hurling billions of tons of free protons and electrons at high speed our way, so not much chance of any aurora).
Canon R7 with RF 100-500mm L IS lens with x1.4 tele-extender (700mm), f/10, 1/200 sec, ISO 125, hand-held stabilised. Baader solar film filter.
As is usual for us low-lying land-dwelling urbanites there is significant difference in seeing across different parts of the sun's disk so I processed 2 images - from a total of 92 taken - as each sunspot group varies in quality, and you can see the differences.
And to compare, an image taken by NASA's Solar Dynamics Observatory space probe in a geosynchronous orbit (a rather more favourable location B ).
Needs to be viewed at 100% size for the extra detail, using any viewer other than a browser as most if not all show a 'quick' degraded image. Any view of a downloaded image usually does the trick.
William
=CanR7_069830_M4-160.jpg (260K)=
=CanR7_069830_M4-160.jpg (232K)=
=Sun_2025-08-28_1024_HMIIF.jpg (315K)=
Altitude 47.8º
Diameter 31º 40'
Distance 1.0102 AU (we're now further from the sun than average - we are closest in winter, January 3rd and furthest in summer, July 4th - so the sun's diameter is slowly getting larger. Solar eclipses in winter tend towards annular rather than full, depending on the moon's own wandering, but those in the summer last longer.)
The magnetic field of the large lower left sunspot group is complex so whilst it's likely to produce the odd energetic flare it's unlikely, for now, to result in a coronal mass ejection (CME, hurling billions of tons of free protons and electrons at high speed our way, so not much chance of any aurora).
Canon R7 with RF 100-500mm L IS lens with x1.4 tele-extender (700mm), f/10, 1/200 sec, ISO 125, hand-held stabilised. Baader solar film filter.
As is usual for us low-lying land-dwelling urbanites there is significant difference in seeing across different parts of the sun's disk so I processed 2 images - from a total of 92 taken - as each sunspot group varies in quality, and you can see the differences.
And to compare, an image taken by NASA's Solar Dynamics Observatory space probe in a geosynchronous orbit (a rather more favourable location B ).
Needs to be viewed at 100% size for the extra detail, using any viewer other than a browser as most if not all show a 'quick' degraded image. Any view of a downloaded image usually does the trick.
William
=CanR7_069830_M4-160.jpg (260K)=
=CanR7_069830_M4-160.jpg (232K)=
=Sun_2025-08-28_1024_HMIIF.jpg (315K)=
Reply all
Reply to author
Forward
0 new messages