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K-Corona Measurements at the 20 April 2023 Eclipse

Presentation #108.10 in the session Instrumentation and Data Center Posters.

Published onSep 18, 2023
K-Corona Measurements at the 20 April 2023 Eclipse

During the total solar eclipse of 20 April, 2023 in Exmouth, Australia, we carried out several experiments aiming at investigating the low solar corona. We used a low dispersion (0.28 Å/pixel) slit spectrograph to obtain spectra covering the interval from 3600-4700 Å between 1-1.5 R⦿. The scattering of the photospheric emission by the high-temperature, high-velocity coronal electrons smears out any Fraunhoffer lines, but leaves broad spectral signatures that can be used to infer the magnitude of the broadening and hence the coronal electron temperature (Cram, 1976). Such measurements have been carried out a few times in the past (e.g. Ichimoto, et al., 1996; Reginald, 2009) and are the basis of the upcoming CODEX mission.

We will describe our experimental setup and present our preliminary analysis of these spectra, which also show several emission lines in this wavelength interval. We further obtained slit jaw images of the K-corona above an active region, which show small scale structures which we compare with images from SDO/AIA and GONG/H-alpha.

Finally, we operated a test site for the CATE 2024 experiment, obtaining white-light images of the corona with a linear-polarization-sensitive camera. We examine the noise characteristics of the data and present plans for future eclipse observations.

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