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SPECTROHELIOGRAPHS are H-alpha spectroheliograms which are
generally taken with telescopes equipped with a half-angstrom
bandwidth Halle filter. These H-alpha observations consist of
solar patrols (routine monitoring) of the whole disk or selected
regions of the sun; two of the six instruments on board the
OSO-7 were a EUV spectroheliograph and a Hard X-ray Spectrometer
(Datlowe, Elcan, and Hudson 1974). The spectroheliograph
provided 5'x5' rasters spectroheliograms) over the active region
at four wavelengths every 61 s, with a pixel size of 12' x
20'. Only about 1/3 of the solar image was scanned. The
instrument could co-record H-alpha spectroheliograms with a wide
0.086 nm band pass, blue shifted 0.016 nm from the H-alpha rest
wavelength through the same aperture as the EUV
spectroheliograms.
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