The Dutch Observatory

Clear skies for my observing session. Another spotless day for the Sun. The prominences have shifted over the last 24 hours. We now have a small prom in the NW but a beautiful hedgerow prom at the SE limb. Full disk images today and a close up of the Prom.

Clear and stable skies.  Another spotless Sun today.  However a few nice prominences are visible at the NE and SW limbs.
Full disk images as well as close ups in Ha of the Proms.

The storms passed through here around 3:30am this morning, so it was a short night.  But the observing session this morning revealed again a spotless sun for spotless day 727 since solar maximum.  A few small filaments and a little prom could be seen in Ha, and some plages in Cak.  In 540nm the Sun is featureless today.

Clear Skies today, getting ready for the storms tomorrow.  Another spotless day, however a very small pore is seen near the Eastern limb.  This area shows cycle 24 polarization, but the area in the right bottom corner of the CaK closeup shows cycle 25 polarization.  For the rest, a quiet Sun.

It was cloudy this morning but it cleared up somewhat.  Still, the seeing was poor with win gust of 15-20 mph.  The Sun remains spotless for another day with a few filaments in the NW and SW.  Today full disk images only.

Another spotless day after AR2759 decayed to a plage.  Full disk images in the three wavelengths and no WL close up today, but close ups of the plage in Ha and CaK.

One Active Region….three days …. in three wavelengths.
Three days in the evolution of AR2759.

Shown are close ups of AR2759 on April 2nd, April 3rd, and April 4th in Ha, 540nm and CaK.  The horizontal comparison shows the evolution over the three days shown in the images, whereas the vertical comparison shows the difference we see in different wavelengths.  On the first day when the area measured 20 millionths and was a D-class area, the 540nm and CaK image are enlarged a bit, but one can see the faint faculae in 540nm how they pretty much follow the patterns of the plages in the other wavelengths. Interesting to see the penumbra in the 540nm image on the 2nd at the southern outside of the two larger spots, whereas the center spot is devoid of any penumbra. Also pretty obvious how much the spots have deteriorated on the last day. And lastly, it shows how my CaK scope’s optics are affected by corrosion in need for resurfacing.

A late session today but clear skies.  AR2759 has deteriorated quite a bit.  I missed it in WL for the first observation, but got it the second time around.  Two leading spots and one following.  The plages are still nicely to see in CaK and Ha.  Full disk images today as well as close ups in the three wavelengths.

Another beautiful day with clear and perfect skies. AR2759 has increased to 30 millionths but looks a little more compact.  Today full disk images as well as close ups of AR2759 in the three wavelengths and the prominence in the SE in Ha.

A Short Summary of CR2228

Carrington Rotation CR2228 covered the time period from 2020-03-01 0126 UT – 2020-03-28 0857 UT.

For two days on March 9th and the 10th, the rotation did bring a new active region AR2758. On March 9th as an Hrx, and 10th as a Cro area, however, its size did not exceed 20 millionths.  I did not have the time to keep up with the Reverse Polarized Areas during this rotation, but will catch up for the next summary with a new reverse polarized area report. On March 28rd the current spotless streak stands at 18 spotless days.   Overall Solar Activity remained Very Low and the rotation increased the spotless days count since solar maximum to 716 days. Finally, during the period SWPC reported three A-class, one B class and no C-class flares.