September 17, 2015 on 4:16 pm | In Sun | Comments Off

The Sun’s activity is picking up a bit to medium.  1M-class and 15 C-class flares in the last two days, 13 of them in AR2415.  Total sunspot area today is 680 millionths with a total of 27 spots, 20 of them in AR2415.  So let’s see how 2015 will continue, although 2418 is growing faster.  In addition a very nice prominence is visible at the eastern limb which I measured as about 40,000 miles high.  Today the solar disk in the three wavelength as well as a close up of 2425 and 18.

2015-09-17-1403_5-TR-540nm-1.jpg 2015-09-17-1416_6-TR-CaK-1.jpg 2015-09-17-1423_0-TR-Ha-2.jpg

2015-09-17-1407_1-TR-540nm.jpg 2015-09-17-1407_5-TR-540nm.jpg

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