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Cosmic Ray Scrubbing


Section 5.3.6 of the Software Operations Manual briefly describes two capabilities of the SECCHI flight software to remove cosmic rays from HI images. The first is a two image scrub where the current image is compared with the previous image on a pixel by pixel basis. If the current image pixel is greater than previous pixel plus N times the photon noise of the pixel, the pixel is replaced with the previous pixel. The three image scrub takes the median value of the current, previous and oldest image.