1991年7月11日日食观测的图象复原

１９９１年７月１１日日食期间，在大熊湖天文台进行了白光观测．图象是用６５ｃｍ反射系统和ＯＳＬ的ＣＣＤ获得的．月亮边缘始终包含在视场之中，从模糊的月亮边缘轮廓推得了一维的视宁度点扩散函数（ＰＳＦ），其中包含了望远镜引起的畸变。当天的ＰＳＦ的宽度介于０．８到１．３弧秒之间。假设存在圆柱对称性，则可得到二维的ＰＳＦ。然后，运用视宁度函数，对所观测的白光像消卷积。复原方法将观测到的ｒｍｓ反衬值由５％增强到１８％；亮桥可能亮于正常的光球强度；暗的半影纤维可能暗到正常光球的５０％；而亮纤维可能达到正常光球值。

Image Reconstruction with July 11, 1991 Eclipse Observation

White-light observations were carried out during the eclipse of July 11,1991,at Big Bear Solar Observatory.The images were obtained by the 65-cm reflector with the OSL CCD camera.The lunar limb was always included in the fields of view.We derived the one-dimensional point spread function(PSF)of the seeing.which includes the degradation produced by the telescope, from the smeared lunar limb profile.The width of the PSF is between 0.8 to 1.3 arcsec on that day.Assuming a cylindrical symmetry,we obtained the two-dimensional PSF.We then used the seeing function to deconvolve the observed white-light images.The reconstruction method enhances the observed 5% value to rm contrast to 18%;light bridges may be brighter than the normal photosphere;dark penumbra fibrils could be as dark as 50% of normal photosphere while the bright fibrils could reach the brightness of normal photosphere.