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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

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The Sun - 23rd Feb 2019

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The Sun - 23rd Feb 2019

Post by David_The_Bears_Fan » Sat Feb 23, 2019 8:30 pm

Foggy and cloudy this morning but then the cloudy parted and left us with a sunny afternoon. There were no spots in white light but some faculae on the limb. I also did some polar shots, looking for polar faculae but there was almost no activity at all. There was a nice plage area in Ca-K as well as some small proms. H alpha showed a nice filament and some surface activity.
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Re: The Sun - 23rd Feb 2019

Post by MAURITS » Sat Feb 23, 2019 9:15 pm

Very nice done David ...

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Re: The Sun - 23rd Feb 2019

Post by marktownley » Sun Feb 24, 2019 4:37 am

Good captures there David!
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Re: The Sun - 23rd Feb 2019

Post by Carbon60 » Sun Feb 24, 2019 6:09 am

Nice set of images, David. You always seem able to capture even the most delicate of proms in CaK. Well done.

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Re: The Sun - 23rd Feb 2019

Post by Montana » Sun Feb 24, 2019 6:38 pm

What a beautiful set David :hamster: I am glad you had a look for the polar facuale, I think I have only seen them once in a shot from Eric last weekend. This year is the year to see them so we should all be on the look out for these tiny regions


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