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Digital Mt. Wilson Solar Archive Index |
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A set of study images has been scanned using a MicroTex 9600XL scanner. The scans were to a 16-bit tif file which was then analyzed using software developed by John Boyden at UCLA. This package finds the solar limb and determines a solar radius, identifies active regions based on the brightness, removes azimuthal variations in the non-active region intensity, fits a center-to-limb intensity function which is then subtracted. The center to limb intensity ratio is assumed to be constant so that the plate intensity to density curve can be adjusted. The intensity residuals left after subtraction of the background center to limb intensity function are then scaled using the plate intensity to density curve. The tif images which can be accessed through the links below result from this process.
First new image with the Scanmate F14, Oct. 23, 1961, 16 bit tiff, open with photoshop.