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Monitoring solar activity with PEPSI

Published online by Cambridge University Press:  03 March 2020

Ekaterina Dineva ,
Carsten Denker ,
Klaus G. Strassmeier ,
Ilya Ilyin  and
Alexei A. Pevtsov
Ekaterina Dineva
Affiliation:
Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14882 Potsdam, Germany Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24/25, 14476 Potsdam-Golm, Germany
Carsten Denker
Affiliation:
Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14882 Potsdam, Germany
Klaus G. Strassmeier
Affiliation:
Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14882 Potsdam, Germany
Ilya Ilyin
Affiliation:
Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14882 Potsdam, Germany
Alexei A. Pevtsov
Affiliation:
National Solar Observatory, 3665 Discovery Drive, Boulder, CO 80303, U.S.A.
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Abstract

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Synoptic Sun-as-a-star observations are carried out with the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI), which receives light from the Solar Disk-Integration (SDI) telescope. Daily spectra are produced with a high signal-to-noise ratio, providing access to unprecedented quasi-continuous, long-term, disk-integrated spectra of the Sun with high spectral and temporal resolution. We developed tools to monitor and study solar activity on different time-scales ranging from daily changes, over periods related to solar rotation, to annual and decadal trends. Strong chromospheric absorption lines, such as the Ca ii H & K λ3934 & 3968 Å lines, are powerful diagnostic tools for solar activity studies, since they trace the variations of the solar magnetic field. Other lines, such as Hα λ6563 Å line and the near-infrared (NIR) Ca ii λ8542 Å line, provide additional information on the physical properties in this highly complex and dynamic atmospheric layer. Currently, we work on a data pipeline for extraction, calibration, and analysis of the PEPSI/SDI data. We compare the SDI data with daily spectra from the Integrated Sunlight Spectrometer (ISS), which is part of the Synoptic Long-Term Investigation of the Sun (SOLIS) facility operated by the U.S. National Solar Observatory (NSO). This facilitates cross-calibration and validation of the SDI data.

Keywords

Sun: chromosphereSun: activityinstrumentation: spectrographstechniques: spectroscopicmethods: data analysis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 351 - 353
Copyright
© International Astronomical Union 2020

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