Is the Shelyak optical kit a complete SUNSCAN spectroheliograph?
No. This is a kit containing only the optical elements required for the STAROS Projects SUNSCAN. Shelyak says the 3D-printed parts and complementary elements (focuser, camera, RP4, tripod and so on) are not included.
What is the purpose of the 2400 lines/mm grating in the SUNSCAN?
The holographic grating is the core component that splits sunlight into its spectrum. A high line count of 2400 lines/mm provides high dispersion, which spreads the light out more. Shelyak does not publish a resolution figure for the SUNSCAN.
How do I choose between the 7 µm and 10 µm slits for the SUNSCAN?
The choice depends on your imaging goal. The 7 µm slit gives more spectral resolution; the 10 µm slit lets more light through. Follow the SUNSCAN project's guidance for your setup.
Is building the SUNSCAN project suitable for a beginner?
It is a self-build project: you source the 3D-printed parts and the complementary elements, then assemble and adjust the instrument following the SUNSCAN website. Judge the work involved from the instructions published there.
How is the finished SUNSCAN instrument controlled?
The SUNSCAN is designed by STAROS Projects as a stand-alone instrument. Shelyak says it can be controlled via a smartphone or tablet application. The RP4 is one of the elements you source yourself.
Can I image the Sun in H-alpha with the completed SUNSCAN?
Yes. The principle of the spectroheliograph is to allow imaging at any user-selected wavelength. Shelyak says SUNSCAN images the Sun at the wavelength of your choice, so the hydrogen-alpha line (656.3 nm) is one option. Never view the Sun directly, and follow the project's instructions.
What kind of features can I see with the SUNSCAN that I can't see with a standard white-light solar filter?
A white-light filter shows you the Sun's photosphere, primarily sunspots and granulation. A completed SUNSCAN allows you to image the chromosphere in specific spectral lines. This reveals dynamic features like filaments (dark ribbons of plasma), plage (bright active regions), and prominences (eruptions at the solar limb), which are invisible in white light.
Where can I find the assembly instructions and 3D printing files for the SUNSCAN?
The SUNSCAN is a project developed and maintained by STAROS Projects. Shelyak says the description, assembly and adjustment of the instrument are described at sunscan.net.
