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Korea Astronomy and Space Science Institute (KASI) has been developing anext-generation coronagraph (NGC) in cooperation with NASA to measure thecoronal electron density, temperature, and speed simultaneously using fourdifferent filters around 400 nm. KASI organized an expedition team todemonstrate the coronagraph measurement scheme and the instrumental technologythrough the 2017 total solar eclipse (TSE) across the USA. The observation sitewas in Jackson Hole, Wyoming, USA. We built an eclipse observation system,so-called Diagnostic Coronal Experiment (DICE), which is composed of twoidentical telescopes to improve a signal to noise ratio. The observation wasconducted with 4 wavelengths and 3 linear polarization directions according tothe planned schedule in a limited total eclipse time of about 140 seconds.Polarization information of corona from the data was successfully obtained butwe were not able to obtain global information of coronal electron temperatureand speed in the corona due to a low signal-to-noise ratio of the opticalsystem and a strong emission from the prominence located in the western limb.In this study, we report the development of DICE and observation results fromthe eclipse expedition. TSE observation and analysis by using our own developedinstrument gave an important lesson that a coronagraph should be carefullydesigned to achieve the scientific purpose of this study. And it was a veryuseful experience in the way for the success of follow-up NASA-KASI jointmissions called the Balloon-borne Investigation of the Temperature and Speed ofElectrons in the Corona (BITSE) and COronal Diagnostic EXperiment (CODEX).

Toward Next Generation Solar Coronagraph: Diagnostic Coronagraph Experiment