SPECTROHELIOGRAPHS
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.
Cameras