Swansea Astronomical Society Blog

Friday, August 10, 2012

 

The Sun in Green continuum light and afocal

A DMK21AS camera fitted with a Baader green continuum filter was placed at the prime focus of an 80mm ED f/5.5 refractor, fitted with a glass Thousand Oaks solar filter. Five overlapping reagions of the Sun were imaged and the resulting images merged in Jon Grove's iMerge software.
Click on the image to get a larger view:

A Fujifilm F-450 digital compact camera was set to monochrome mode and was handheld to an 18mm orthoscopic eyepiece fitted to the scope. The camera was zoomed and part of the Sun was imaged:


Steve Wainwright


Thursday, August 9, 2012

 

The Sun in Ca K-line and H-alpha light

ADMK21AS camera fitted with a x 2.5 Barlow and attached to a Solarmax ll 60 BF15 H-alpha scope was used to image two overlapping areas of the solar disk in a region where there was a huge snaking prominence. The images were merged to produce the final image.
Click on an image to see a larger view:


A DMK21AS camera was placed at the prime focus of a Solarmax ll 60 BF 15 H-alpha scope and four overlapping areas of the Sun were imaged. The resulting images were merged into a final image.


The same procedure as followed with a Ca K-line Coronado PST to produce the final image:

The Ca K-line and the H-alpha images were combined 50% into a composite image that shows the features revealed by both ends of the spectrum:


Steve Wainwright


Monday, August 6, 2012

 

Colour on the Moon

A DFK21AS camera was placed at the prime focus of a Skymax 127, Maksutov and two overlapping regions of the Moon  at the junction of Mare Tranquillitatis and Mare Serenitatis were imaged. 10,000 frame AVIs were captured of each area and frames of 90% quality were stacked to produce the two images. These two images were merged in Photoshop to produce the final image. The camera was set to 60fps which was possible because debayering was not done on the camera during capture but was done by Registax 5 in post capture processing. The saturation of the final image was slightly increased which revealed subtle colour differences between the two maria and the adjacent higher ground. These colour differences reflect different mineralogy of the different areas.
Click on the image to get a larger view:


Steve Wainwright


Sunday, August 5, 2012

 

A Solar Day at the National Botanic Gardens for Wales

In partnership with the National Botanic Garden for Wales, the Swansea Astronomical Society delivered an exhibition on safe viewing of the Sun. The facilities of the gardens such as the cafeteria and the shop provided shelter and interest during the times that the weather was unkind.
After showers and sunny intervals the Sun finally came out in the mid afternoon and visitors to the Solar viewing sessions were treated to spectacular views of the Sun in white light and Hydrogen alpha light through a large array of solar telescopes. David Grace brought a microwave telescope from Cardigan to demonstrate another way of detecting solar activity. Windsor Displays kindly provided some back projection film that allowed the construction of a totally contained, Solar Funnel, solar projection system. Inside the Marquee was an electronic display of solar images and in the Theatre Brian Spinks gave talks on solar astronomy. The foyer of the Theatre housed an astronomical display overseen by Brian Stokes, Chairman of the Swansea Astronomical Society. This selection of photographs shows members of the Swansea Astronomical Society interacting with visitors to the exhibition and helping them to view the Sun in total safety. Click on any image to get a larger view:

Brian Stokes with Mavis at the reception desk

Viewing the Sun with a Solar Funnel, a totally enclosed, safe way of projecting the Sun. The screen was made from back projection film kindly donated by Windsor Displays:













The microwave solar dish





Controlling the Merlin mount with the Solar Funnel, solar projection kit.




Children could see the Sun safely and all observers were supervised at all times.


Despite a damp start, the exhibition, demonstrations and talks were a success and the society is looking forward to our Solar days at the Waterfront Museum in Swansea on August 18 and 19.

Steve Wainwright

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