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Alan,
Yes, you can use a stationary set-up and just allow the sun to drift across the slit gap - it takes about 120 sec to obtain a full scan.
Each frame of the solar spectrum AVI recorded is then "sliced" into very narrow sections (one or two pixel wide) centred on the target wavelength and recombined to produce a spectroheliogram, a mosaic image at the selected wavelength and bandwidth.
Bandwidths down to <2A (much better than the commercial narrowband commercial filters) can be regularity achieved.
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