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That master of innovation in spectroscopy, Christian Buil has just announced his latest remarkable creation. It appears to be a fully integrated computerised spectroheliograph. In essence, a “Smart Spectroheliograph” which can produce narrow band images of the sun at any wavelength you chose without a telescope or computer
http://www.astrosurf.com/topic/171610-soleil-du-10102024-et-nouveaut%C3%A9/Cheers
RobinSo that does look very interesting. A normal spectroheliograph has an oscillating slit. Is my understanding correct that this relies on the Sun drifting across the slit to form an image? Looking at the tripod it is clearly not driven. If so, it must use some clever sensor integration trick.
You can do it with a fixed mount using the natural sidereal motion to drift the sun across the slit as I experimented with here with my LHIRES
http://www.threehillsobservatory.co.uk/astro/spectra_29.htm
With Buil’s other instrument the SolEx, it is essentially a high resolution spectrograph which is mounted on a telescope and the mount is normally driven at x times sidereal, taking advantage of improvements in camera sensitivity and speed to reduce the scan time so the result is less reliant on stable conditions. The details of this device are yet to be revealed though
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