J. Space Weather Space Clim.
Volume 10, 2020
Topical Issue - Space Weather Instrumentation
|Number of page(s)||14|
|Published online||18 December 2020|
Data reduction pipeline for MOF-based synoptic telescopes
Department of Physics, University of Rome Tor Vergata, 00133 Rome, Italy
2 INFN-GSGC L’Aquila and DSFC University of L’Aquila, 67100 L’Aquila, Italy
3 Next Ingegneria dei Sistemi S.p.A., 00131 Rome, Italy
4 ESA Science and Operations Department, c/o NASA/GSFC, MD 20071, USA
5 Institute for Astronomy, University of Hawaii, HI 96768-8288, USA
6 Department of Physics and Astronomy, Georgia State University, GA 30303, USA
7 MIUR, 00153 Rome, Italy
8 Jet Propulsion Laboratory – NASA, CA 91109, USA
9 INAF – Capodimonte Astronomical Observatory, 80131 Napoli, Italy
10 Eddy Company, Apple Valley, CA 92308, USA
11 INAF – Astronomical Observatory of Rome, 00078, Italy
* Corresponding author: firstname.lastname@example.org
Accepted: 3 November 2020
There are strong scientific cases and practical reasons for building ground-based solar synoptic telescopes. Some issues, like the study of solar dynamics and the forecasting of solar flares, benefit from the 3D reconstruction of the Sun’s atmosphere and magnetic field. Others, like the monitoring and prediction of space weather, require full disk observations, at the proper sampling rate, combining H-alpha images and Doppler velocity and magnetic field. The synoptic telescopes based on Magneto Optical Filters (MOF) using different lines are capable of measuring the line-of-sight Doppler velocity and magnetic field over the full solar disk at different ranges of height in the Sun’s photosphere and low chromosphere. Instruments like the MOTH (Magneto-Optical filters at Two Heights), using a dual-channel based on MOFs operating at 589.0 nm (Na D2 line) and 769.9 nm (K D1 line), the VAMOS instrument (Velocity And Magnetic Observations of the Sun), operating at 769.9 nm (K D1 line), and the future TSST (Tor Vergata Synoptic Solar Telescope), using a dual-channel telescope operating at 656.28 nm (H-alpha line) and at 769.9 nm (K D1 line), allow to face both aspects, the scientific and the operative related to Space Weather applications. The MOTH, VAMOS and TSST data enable a wide variety of studies of the Sun, from seismic probing of the solar interior (sound speed, rotation, details of the tachocline, sub-surface structure of active regions), to the dynamics and magnetic evolution of the lower part of the solar atmosphere (heating of the solar atmosphere, identification of the signatures of solar eruptive events, atmospheric gravity waves, etc.), to the 3D reconstruction of the solar atmosphere and flare locations. However, the use of MOF filters requires special care in calibrating the data for scientific or operational use. This work presents a systematic pipeline that derives from the decennial use of MOF’s technology. More in detail, the pipeline is based on data reduction procedures tested and validated on MOTH data acquired at Mees Solar Observatory of the University of Hawaii Haleakala Observatories and at South Pole Solar Observatory (SPSO), at the Amundsen-Scott South Pole Station in Antarctica, during Antarctica Summer Campaign 2016/17.
Key words: Magnetic fields / Photosphere / Instrumentation and Data Management / Instrumental Effects
© R. Forte et al., Published by EDP Sciences 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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