The Dutch Observatory

The Sahara dust clouds have passed and I could see blue skies between the clouds today.  Today’s session showed a spotless Sun.  A few small filaments could be observed in the Ha image in the South as well as the NE. For the rest it is pretty quiet.

The observing session this morning was a challenge.  I had to image through two cloud decks, moving in different directions with bad seeing conditions.  The Sun is spotless again and the only feature I made out was a filament or sections of a filament which stretched from the center NW to the W limb.  The pieces are hard to see.  In addition, because of the interruptions between imaging, I used the wrong optical configuration for the Ha image, which had to be enlarged over 50% during processing.  So I apologize for the low quality caused by many factors.

A break in the clouds, but still below average seeing conditions.  The Sun remains spotless today with a filament in the Norther hemisphere and a prom in the NE.

Clear skies, but the seeing was below average.  Another spotless Sun today.  However, the prominences from yesterday can still be seen.  However I could not make out anymore the plage in the NE as a faculae in WL, but a new plage, visible in CaK, seems to turn to the visible side a few degrees more North.  A very quiet Sun today.

Clear skies again but no spots to see today.  This makes for spotless day 774 since Solar Maximum.  The NE plage and faculae are still visible and we see some nice proms in the NE and SW.

The clouds cleared and we had another opportunity to observe the Sun.  A new rotation CR2232 started today.  AR2765 is gone but we see a faculae in WL at the NE limb. Its also nicely visible in CaK.  A few proms in Ha.  For the rest its quiet.

One Active Region…… in three wave lengths…… over 5 days…….

Here a composite image of AR2765 which was visible on the Sun from June 4 until June 16.  It boosted 130 millionths on the 6th, and its max. Wolf number was 17 on 6/9. Its classification was an Hsx for the days shown.  The composite covers the 5 consecutive days from 6/11 till 6/15 and are shown in Continuum, Ha and CaK.

Clear skies for a little while with average seeing.  AR2765 is getting ready to turn to the back side of the Sun.  It still can be made out as well as the faculae, in visible light, and the plages are still nicely visible in CaK and Ha. It covers 20 millionths with 1 spot and is an Hsx spot.  A few filaments are also visible.  Unfortunately my full disk 540nm image has some of the Southern hemisphere cut of.  Well, I did not notice it until I started processing.   So far AR2765 has accounted for 900 millionths for the current Total Regions Areas during CR2231.

The skies cleared and showed AR2765 is still there, covering today 60 millionths with one spot.  The faculae were nicely visible in WL and we could see some filaments in Ha.  Also a few proms.  Today full disk images and close ups of the mentioned areas.

The clouds cleared.  Average seeing today.  AR2765 still shows as a Hsx, 50 millionths, and a one spot active region.  A very small but very bright region showed in Ha in the Eastern hemisphere, and I do include an image of that today.  For the rest the Sun is pretty quiet,  and chances are pretty good that AR2765 will make it to the Western limb.