First EUVI Coronal Images Seen Without Stray Light.

FRAZIN, RICHARD A.; SHEARER, PAUL; VÁSQUEZ, ALBERTO M.

Snowmass, Colorado.

Conferencia; 2011 SHINE WorkshopConference; 2011

SHINE Consortium

Analysis of coronal holes with EUV image data is severely compromised by stray light, which can account for the majority of the observed emission. Stray light is mostly caused by diffraction at the aperture and non-specular scatter from the mirrors. Here we present the first stray-light corrected STEREO/EUVI images and 3D tomographic reconstructions of coronal holes based on the cleaned images. New determinations of the 3D temperature and density from differential emission measure tomography are given.The stray light contamination of the images can be modeled as a convolution as the true (unknown) image with a broad-winged blurring function. However, laboratory measurements have not beed adequate to determine this blurring function with sufficient accuracy. Thus, removing the blur required simultaneous determination of the image and the blur function, a difficult and nonlinear problem called blind deconvolution (BDC). The results of this process are highlighted.