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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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Moving forward from solar cycle 24 to 25

24Nov18 - New Sunspot in Tri-band

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yltansg
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24Nov18 - New Sunspot in Tri-band

Post by yltansg » Sat Nov 24, 2018 1:45 pm

24Nov18, November is the wettest month for us in Singapore. It has been raining almost every day. Today we had bright sunshine but the Sun was covered by fast moving clouds throughout day. I was glad to have the equipment out and some images after patient waiting. However the seeing condition was poor and the passing clouds degraded the images.

A new flaring sunspot was spotted near the middle of the solar disk in white light,(solar surface) Calcium-K (solar lower atmosphere) and H-Alpha (Upper atmosphere) wavelengths.

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Setup for WL imaging - Megrez 90 with a Thousand Oaks white light filter + Point Grey Grasshopper 3 camera

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Setup for CAK imaging - Megrez 90 with Lunt CAK diagonal + Point Grey Grasshopper 3 camera

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Setup for HA imaging - Borg 76 refractor + Solarscope 50mm DS etalons + Point Grey Grasshopper 3 camera

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marktownley
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Re: 24Nov18 - New Sunspot in Tri-band

Post by marktownley » Sat Nov 24, 2018 3:58 pm

Lovely image Alfred! Congrats on the SPoD!
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MapleRidge
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Re: 24Nov18 - New Sunspot in Tri-band

Post by MapleRidge » Sun Nov 25, 2018 11:17 pm

Great shots Alfred, glad to hear you had a break form the rain ;)

Brian
Brian Colville

Maple Ridge Observatory

Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

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