Examinations of the relative alignment of the instruments on SOT

T. Okamoto, Y. Katsukawa, T. Shimizu, K. Ichimoto, Y. Suematsu, S. Tsuneta, T. Tarbell, and SOT team

We report the results of the examination about the relative plate scales and the alignment of the instruments on SOT using a data set which has a grid pattern over the entire FOV. SOT has the filtergrams (FGs) and the spectro-polarimeter (SP). The FGs consist of six broadband filter imagers (BFIs) and six narrowband filter imagers (NFIs). We examined the displacements among the filters to an accuracy of less than 0.1 pixel. It is important to know relative displacements and plate scales of these instruments for accurate alignment of observational data. The main contents in this presentation are in the following: 1. Relative alignment of FG images a. Displacements and plate scales among BFIs and NFIs b. Dependence on focus position 2. Relative alignment of SP Images a. Displacements and plate scales between SP and NFI b. Uniformity of scanning steps

Correspondence

Takenori Okamoto, Kwasan Observatory, Kyoto University

presentation

poster