(请注意，照太阳的照片只能在太阳刚升起于地平线或快落山的时候照，千万别在其它时间照。那时的太阳可以让你永远失明）。
今天早上，看到升起的太阳，照了几张照片，发现sun spots:
相机是Nikon Coolpix A900 at 35x
On 3/15/2009, I had an entry on sun spots:
https://blog.wenxuecity.com/myblog/40376/200903/24486.html
什么是太阳黑子:
https://en.wikipedia.org/wiki/Sunspot
Sunspots are phenomena on the Sun's photosphere that appear as temporary spots that are darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity.[2] Their number varies according to the approximately 11-year solar cycle.
Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from 16 km (10 mi)[3] to 160,000 km (100,000 mi).[4] Larger sunspots can be visible from Earth without the aid of a telescope.[5] They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge.
Indicating intense magnetic activity, sunspots accompany other active region phenomena such as coronal loops, prominences, and reconnection events. Most solar flares and coronal mass ejections originate in these magnetically active regions around visible sunspot groupings. Similar phenomena indirectly observed on stars other than the Sun are commonly called starspots, and both light and dark spots have been measured.[6]
前几天微信上报道太阳黑子on 6/28/2023:
Last 24 hours: Sun activity is back to low levels. Only C flares were produced in the past day (11 UTC yesterday and 11 UTC today). There were a total of 14 C flares during the period. The largest was a C5.5 flare from sunspot AR3354 at 18:39 UTC on June 28, 2023.2 days ago
