SDAC Solar Image

SDAC

Aurora Borealis

How solar filters work

Here are some useful articles to show how solar filters work

Display # 
# Web Link Hits
1   Link   An Introduction to air-spaced Etalons
Part 1: An Introduction to Air Spaced Etalons and Solar Telescope Technology
by Colin Kaminski
3670
2   Link   Resonant Spaces Part 2
Resonant Spaces - Part 2: An Introduction to Solid Spaced Etalons and Solar Telescope Technology
by Colin Kaminsk
5052
3   Link   Experiment in double stacking
Bob from Cloudy Nights forum posted this on his double-stacking Coronado SM 90 experiment
3097
4   Link   Double stacking
Here is Bob Yoesle's excellent piece on double stacking Ha front ethalon units
3479
5   Link   Single v Double-stacking
Here is an excellent Cloudy Nights forum thread discussing the differences between single and double stacking H-alpha telescopes
2723
6   Link   How a solar wedge works
Here are some diagrams as to how the solar wedge works
2543
7   Link   Lunt Solar Wedge from the inside out
Here Mark Townley dismantles a Lunt Solar Wedge.
2107
8   Link   Spectrohelioscope
Here is a CN thread on spectrohelioscopes
2520
9   Link   Why nightime H-alpha filters do not work for white light
Here is a superb explanation as to why it is not possible to use a night time hydrogen-alpha filter for solar work by Bob Yeosle
2059
10   Link   CaK system designs
Here is an extremely interesting thread on the CN forum showing how Cak filtration systems work.
2533
11   Link   Optical filter construction
Here is an excellent document describing the difference between hard and soft solar filer coatings.
1558
12   Link   Photomertic properties of commercial halpha filters
Here is an excellent paper discussing the photometric properties of commercial H alpha filters
1444
13   Link   Analysis of F-P Ha Filters
Here is an excellent analysis of the F-P etalon by Christian Valadrich
957