Abstract
We present an overview and instrumental details of the solar XUV Doppler Telescope (XDT) launched in January 1998 with the S520CN-22 sounding rocket of the Institute of Space and Astronautical Science. The XDT observes nearly single-temperature solar corona at 1.8 MK with angular resolution of ≈ 5′′ pixel size, together with the ability to detect the coronal velocity field with a full-Sun field of view. By use of normal incidence optics whose primary and secondary mirrors are coated with multilayer materials in two sectors, the XDT takes images of the Sun in a set of shorter and longer wavelength bands around the Fe xiv 211.3 Å emission line. Summation of a pair of images in the two bands provides an image of the 1.8 MK-corona while the difference between the two provides velocity images of the Fe xiv-emitting plasma. A brief description on the observation sequence together with the flight result is also given.
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Sakao, T., Tsuneta, S., Hara, H. et al. The XUV Doppler Telescope (XDT). Sol Phys 187, 303–333 (1999). https://doi.org/10.1023/A:1005127827006
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DOI: https://doi.org/10.1023/A:1005127827006