Jets in the Solar Atmosphere
Final Report Abstract
Flows and jets are essential building blocks of the solar atmosphere. Many different mechanisms contribute to the energy balance in the upper solar atmosphere. The aim of this project was to combine theoretical and observational work for studying the related physical processes. This was a DACH project, i.e. a collaboration between the Leibniz-Institut für Sonnenphysik (KIS) in Freiburg and the Karl-Franzens-Unversität in Graz. The contribution from KIS was to provide and upgrade the instrumentation for multi-line observations in the solar atmosphere. For this the functionality of instrumentation at the existing Vacuum Tower Telescope was expanded in terms of wavelength range of operation and the recordings of observables. Unfortunately, the project was strongly impacted by the outbreak of the COVID-19 pandemic. Observing campaigns for the summers 2020 and 2021 were not possible: Furthermore, the telescope could not obtain the required technical maintenance by the operator, i.e. leading to technical defects of the telescope. As an alternative work during the pandemic, we therefore improved the science capabilities of the instrument in terms of the possibility of remote operation, and recording and processing large volumes of data. Furthermore, we developed a fully new procedure for calibrating spectro-polarimetric data. A comprehensive software pipeline to process the data that were recorded from the upgraded instrument and modelling tools were developed, and published with open access. When access to the telescope became possible again, the DFG funding of the project had reached its end. The development work on including the spectro-polarimetric capabilities and the broad-band channel for image reconstruction could be completed. We continued with own funds after the end of the DFG funding to obtain observational data. The last approach was done in summer 2024. But the weather conditions and technical failures of the telescope did not allow to obtain data for scientific analysis. With the remote operation and the new spectro-polarimetric instrumentation plus calibration procedure the instrument has increased its scientific capabilities. This now allows to offer the HELLRIDE instrument to the wider scientific community as part of the telescope’s regular instrument suite.
Publications
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Polarimeter for the HELLRIDE instrument at Vacuum Tower Telescope. Ground-based and Airborne Instrumentation for Astronomy VIII, 231. SPIE.
Pruthvi, Hemanth & Roth, Markus
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PyAstroPol
Pruthvi, H.
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PyAstroPol: A Python package for the instrumental polarization analysis of the astronomical optics.. Journal of Open Source Software, 5(55), 2693.
Pruthvi., Hemanth
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Kink instability of triangular jets in the solar atmosphere. Astronomy & Astrophysics, 649, A179.
Zaqarashvili, T. V.; Lomineishvili, S.; Leitner, P.; Hanslmeier, A.; Gömöry, P. & Roth, M.
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Prominence instability and CMEs triggered by massive coronal rain in the solar atmosphere. Astronomy & Astrophysics, 658, A18.
Vashalomidze, Z.; Zaqarashvili, T. V.; Kukhianidze, V.; Ramishvili, G.; Hanslmeier, A. & Gömöry, P.
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The New HELLRIDE at the Vacuum Tower Telescope. Solar Physics, 298(3).
Pruthvi, Hemanth & Roth, Markus
