Article
Astronomy & Astrophysics
T. Mehta, K. Jain, S. C. Tripathy, R. Kiefer, D. Kolotkov, A-M Broomhall
Summary: In this study, we investigated the relationship between the solar cycle and the presence and periodicity of the Quasi-Biennial Oscillation (QBO). Using helioseismic techniques and solar activity proxies, we found that the presence of the QBO varied significantly between solar cycles. The QBO presence was reduced in Cycle 24 compared to Cycle 23, and it was not dependent on the depth or frequency of the p-mode.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
K. Mandal, S. M. Hanasoge, L. Gizon
Summary: This study successfully extends the methodology to measure even azimuthal orders of Rossby waves in the Sun, adding credibility to the mode-coupling methodology in helioseismology. The results indicate significant power close to the theoretical dispersion relation for sectoral Rossby modes, with maximum power occurring at mode t = 8.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
J. Philidet, L. Gizon
Summary: This study investigates the impact of turbulent motions on the inertial modes in the Sun's convective zone. The results suggest that the stochastic excitation mechanism by turbulent convection explains the observed mode amplitudes reasonably well. However, the complex power spectra of the modes make the interpretation of the observations challenging.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Igor P. Lopin
Summary: The study investigates axisymmetric magnetohydrodynamic wave modes in the model of a coronal magnetic tube, revealing two families of modes and discussing their properties in twisted and untwisted magnetic fields.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
I Lopin
Summary: This study examines the kink oscillations of a curved coronal slab with finite plasma-beta, simulating a loop arcade. The study finds two surface modes, namely the faster mode and slower mode, in the model. As the internal plasma-beta becomes finite and increases, the phase speed of the faster mode increases, while that of the slower mode decreases.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
I Lopin, I Nagorny
Summary: In this work, we study the impact of curvature on slow-mode oscillations in coronal loop arcade using a theoretical approach. By solving a set of magnetohydrodynamic equations, we derive the dispersion relation that governs the compressible MHD modes in a simple model of curved coronal magnetic structures. Our findings reveal the existence of a band of slow body modes and a single hybrid slow mode in coronal loops under typical circumstances, which exhibit radial kink-like displacements and accompanying longitudinal oscillations. These mode properties can explain the observed Doppler shift, intensity oscillations, and spatial displacements in arcade loops.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
K. Kosak, R. Kiefer, A-M Broomhall
Summary: This study investigates the variation of pseudo-mode frequencies with solar activity during the solar cycle. The results show that acoustic oscillation frequencies are correlated with the solar cycle, while pseudo-mode frequencies vary in antiphase. The analysis is based on data from different instruments, and the findings reveal differences in the frequency variations between the instruments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
David Korda, Michal Svanda
Summary: This study aims to construct a model of flows in average supergranular cells using a consistent time-distance inverse methodology. By analyzing travel-time maps of over 10^4 individual supergranular cells, near-surface divergent horizontal flows and upward vertical flows were discovered. However, systematic errors affected the accuracy of vertical flow estimates, while a longitudinal flow pattern was found to align well with the model of solar rotation in subsurface layers.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Kyuhyoun Cho, Jongchul Chae, Maria S. Madjarska
Summary: The analysis of umbral flashes in merging sunspots suggests that the subsurface of the umbra is an environment where convection can occur more easily than the convergent interface, supporting the cluster model. Further studies based on umbral velocity oscillations in the lower atmosphere are needed for more concrete results.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
David Korda, Michal Svanda, Thierry Roudier
Summary: The study aims to suppress the negative effects of magnetic fields on solar oscillations and measure plasma properties near active regions. This is done through new averaging geometries, a non-linear approach to travel-time measurements, and a consistent inversion method. The new methodology successfully reconstructs surface horizontal flows near active regions and helps understand the depth structure and physical conditions contributing to the evolution of these regions.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Dan Yang, Laurent Gizon, Helene Barucq
Summary: This study aims to improve helioseismic holography for detecting active regions on the far side of the Sun and enhancing space weather forecasts. By using a clear problem formulation, an accurate forward solver in the frequency domain, and better understanding of noise properties, the method was improved. Active regions on the far side can be detected with high confidence by measuring and averaging phase shifts between the ingression and egression wave fields. The improvements in active region detection rate and false discovery rate are attributed to the use of a complete Green’s function and all available observations on the front side.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Yuto Bekki, Robert H. Cameron, Laurent Gizon
Summary: The study focuses on detecting and characterizing modes present in nonlinear numerical simulations of solar convection, highlighting equatorial Rossby modes and columnar convective modes. These modes are compared to linear models and solar observations, providing insights into their amplitudes and impact on heat and angular momentum transport.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Rene Kiefer, Anne-Marie Broomhall
Summary: The study investigates the energy supply rates of solar p modes throughout the solar activity cycle and finds that these rates are anticorrelated with the level of solar activity. Different mode frequency and harmonic degrees show varying strengths of anticorrelation with the solar activity level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Souvik Das, Ahmed Atteya, Pralay Kumar Karmakar
Summary: A recently developed gravito-electrostatic sheath model is used to study the helioseismic oscillation features in the bi-fluidic solar plasma system. The model reveals the evolution of both dispersive and non-dispersive features of the modified gravito-electrostatic sheath mode fluctuations. Different spectral profiles show important features of the perturbations. The stability of the system depends on various parameters and the dispersive features are more pronounced in the self-gravitational domains.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Laurent Gizon, Robert H. Cameron, Yuto Bekki, Aaron C. Birch, Richard S. Bogart, Allan Sacha Brun, Cilia Damiani, Damien Fournier, Laura Hyest, Kiran Jain, B. Lekshmi, Zhi-Chao Liang, Bastian Proxauf
Summary: The study reports observations of the Sun's toroidal modes, with comparisons made to normal modes of a differentially rotating spherical shell to identify high-latitude inertial modes, critical-latitude inertial modes, and equatorial Rossby modes. The high-latitude and critical-latitude modes exhibit maximum kinetic energy density at the base of the convection zone, with the high-latitude modes being baroclinically unstable due to the latitudinal entropy gradient.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
S. K. Solanki, J. C. del Toro Iniesta, J. Woch, A. Gandorfer, J. Hirzberger, A. Alvarez-Herrero, T. Appourchaux, V. Martinez Pillet, I. Perez-Grande, E. Sanchis Kilders, W. Schmidt, J. M. Gomez Cama, H. Michalik, W. Deutsch, G. Fernandez-Rico, B. Grauf, L. Gizon, K. Heerlein, M. Kolleck, A. Lagg, R. Meller, R. Mueller, U. Schuehle, J. Staub, K. Albert, M. Alvarez Copano, U. Beckmann, J. Bischoff, D. Busse, R. Enge, S. Frahm, D. Germerott, L. Guerrero, B. Loeptien, T. Meierdierks, D. Oberdorfer, I. Papagiannaki, S. Ramanath, J. Schou, S. Werner, D. Yang, A. Zerr, M. Bergmann, J. Bochmann, J. Heinrichs, S. Meyer, M. Monecke, M-F. Mueller, M. Sperling, D. Alvarez Garcia, B. Aparicio, M. Balaguer Jimenez, L. R. Bellot Rubio, J. P. Cobos Carracosa, F. Girela, D. Hernandez Exposito, M. Herranz, P. Labrousse, A. Lopez Jimenez, D. Orozco Suarez, J. L. Ramos, J. Barandiaran, L. Bastide, C. Campuzano, M. Cebollero, B. Davila, A. Fernandez-Medina, P. Garcia Parejo, D. Garranzo-Garcia, H. Laguna, J. A. Martin, R. Navarro, A. Nunez Peral, M. Royo, A. Sanchez, M. Silva-Lopez, I. Vera, J. Villanueva, J. -J. Fourmond, C. Ruiz de Galarreta, M. Bouzit, V. Hervier, J. C. Le Clec'h, N. Szwec, M. Chaigneau, V. Buttice, C. Dominguez-Tagle, A. Philippon, P. Boumier, R. Le Cocguen, G. Baranjuk, A. Bell, Th. Berkefeld, J. Baumgartner, F. Heidecke, T. Maue, E. Nakai, T. Scheiffelen, M. Sigwarth, D. Soltau, R. Volkmer, J. Blanco Rodriguez, V. Domingo, A. Ferreres Sabater, J. L. Gasent Blesa, P. Rodriguez Martinez, D. Osorno Caudel, J. Bosch, A. Casas, M. Carmona, A. Herms, D. Roma, G. Alonso, A. Gomez-Sanjuan, J. Piqueras, I. Torralbo, B. Fiethe, Y. Guan, T. Lange, H. Michel, J. A. Bonet, S. Fahmy, D. Muller, I. Zouganelis
ASTRONOMY & ASTROPHYSICS
(2020)
Review
Astronomy & Astrophysics
T. Zaqarashvili, M. Albekioni, J. L. Ballester, Y. Bekki, L. Biancofiore, A. C. Birch, M. Dikpati, L. Gizon, E. Gurgenashvili, E. Heifetz, A. F. Lanza, S. W. McIntosh, L. Ofman, R. Oliver, B. Proxauf, O. M. Umurhan, R. Yellin-Bergovoy
Summary: Rossby waves are a common feature of large-scale motions in the Earth's atmosphere and oceans, as well as playing a significant role in various astrophysical objects. This paper reviews the theoretical and observational aspects of Rossby waves in different spatial and temporal scales in different astrophysical settings, discussing their physical role in various astrophysical processes. Possible future research directions in the theoretical and observational aspects of astrophysical Rossby waves are outlined in the paper.
SPACE SCIENCE REVIEWS
(2021)
Article
Astronomy & Astrophysics
F. Kahil, J. Hirzberger, S. K. Solanki, L. P. Chitta, H. Peter, F. Auchere, J. Sinjan, D. Orozco Suarez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodriguez, A. Gandorfer, D. Germerott, L. Guerrero, P. Gutierrez Marquez, M. Kolleck, J. C. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, J. M. Gomez Cama, I. Perez-Grande, E. Sanchis Kilders, M. Balaguer Jimenez, L. R. Bellot Rubio, D. Calchetti, M. Carmona, W. Deutsch, G. Fernandez-Rico, A. Fernandez-Medina, P. Garcia Parejo, J. L. Gasent-Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Lagg, T. Lange, A. Lopez Jimenez, T. Maue, R. Meller, H. Michalik, A. Moreno Vacas, R. Mueller, E. Nakai, W. Schmidt, J. Schou, U. Schuehle, J. Staub, H. Strecker, I. Torralbo, G. Valori, R. Aznar Cuadrado, L. Teriaca, D. Berghmans, C. Verbeeck, E. Kraaikamp, S. Gissot
Summary: In this study, the Solar Orbiter spacecraft observed small extreme ultraviolet bursts, known as campfires, in the quiet-Sun atmosphere. The majority of these campfires were found to be associated with magnetic reconnection processes, similar to burst-like EUV events discussed in previous literature. However, a quarter of the observed campfires did not show any connection to magnetic activity in the photosphere, suggesting the presence of alternative heating mechanisms for these small-scale EUV brightenings.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Schou
Summary: The article introduces a new method to provide a calibration signal for spectrographs, which eliminates the drawbacks of traditional iodine cell method by using birefringent elements or imaging Michelson in combination. This design can make the calibration signal compact and cover the entire visible spectrum, reducing sensitivity to spectrograph stability.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Schou, J. Hirzberger, D. Orozco Suarez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodriguez, A. Gandorfer, D. Germerott, L. Guerrero, P. Gutierrez-Marques, F. Kahil, M. Kolleck, S. K. Solanki, J. C. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, I. Perez-Grande, E. Sanchis Kilders, M. Balaguer Jimenez, L. R. Bellot Rubio, D. Calchetti, M. Carmona, W. Deutsch, A. Feller, G. Fernandez-Rico, A. Fernandez-Medina, P. Garcia Parejo, J. L. Gasent Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Korpi-Lagg, A. Lopez Jimenez, T. Maue, R. Meller, A. Moreno Vacas, R. Mueller, E. Nakai, W. Schmidt, J. Sinjan, J. Staub, H. Strecker, I. Torralbo, G. Valori
Summary: In order to accurately infer the solar interior, understanding the various physical effects on observations is crucial. This study attempts to measure the complex-valued ratio of the horizontal to vertical displacement of p- and f-modes directly using simultaneous observations from two different instruments. The measured ratio agrees well with the expected value from adiabatic oscillations and indicates that a commonly used approximation should not be used in helioseismic analyses.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
J. Sinjan, D. Calchetti, J. Hirzberger, F. Kahil, G. Valori, S. K. Solanki, K. Albert, N. Albelo Jorge, A. Alvarez-Herrero, T. Appourchaux, L. R. Bellot Rubio, J. Blanco Rodriguez, A. Feller, A. Gandorfer, D. Germerott, L. Gizon, J. M. Gomez Cama, L. Guerrero, P. Gutierrez-Marques, M. Kolleck, A. Korpi-Lagg, H. Michalik, A. Moreno Vacas, D. Orozco Suarez, I. Perez-Grande, E. Sanchis Kilders, M. Balaguer Jimenez, J. Schou, U. Schuehle, J. Staub, H. Strecker, J. C. del Toro Iniesta, R. Volkmer, J. Woch
Summary: This study compares the magnetic field maps obtained by the Solar Orbiter and Solar Dynamics Observatory satellites and discusses possible differences between them. The results show that the line-of-sight magnetograms obtained by the two instruments are remarkably similar, but the vector magnetic field inferred by the Solar Orbiter is stronger, which may be due to data noise.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
F. Kahil, A. Gandorfer, J. Hirzberger, D. Calchetti, J. Sinjan, G. Valori, S. K. Solanki, M. Van Noort, K. Albert, N. Albelo Jorge, A. Alvarez-Herrero, T. Appourchaux, L. R. Bellot Rubio, J. Blanco Rodriguez, A. Feller, B. Fiethe, D. Germerott, L. Gizon, L. Guerrero, P. Gutierrez-Marques, M. Kolleck, A. Korpi-Lagg, H. Michalik, A. Moreno Vacas, D. Orozco Suarez, I. Perez-Grande, E. Sanchis Kilders, J. Schou, U. Schuehle, J. Staub, H. Strecker, J. C. del Toro Iniesta, R. Volkmer, J. Woch
Summary: In this study, wavefront sensing is used to characterize the image quality of the High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) during the Solar Orbiter (SO) mission. The wavefront error of HRT is determined using a pair of focused-defocused images and the point spread function (PSF) is derived through phase diversity analysis. The results show that the wavefront error of HRT is influenced by the distance of SO to the Sun, with the thermo-optical effect of the Heat Rejection Entrance Window (HREW) becoming noticeable at distances <0.5 au. An interpolation scheme is developed to account for the thermal variation of HREW with distance. Additionally, an aberration correction method is introduced to reduce noise caused by image deconvolution while removing aberrations caused by HREW.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. Yang, L. Gizon, H. Barucq, J. Hirzberger, D. Orozco Suarez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodriguez, A. Gandorfer, D. Germerott, L. Guerrero, P. Gutierrez-Marques, F. Kahil, M. Kolleck, S. K. Solanki, J. C. del Toro Iniesta, R. Volkmer, J. Woch, I. Perez-Grande, E. Sanchis Kilders, M. Balaguer Jimenez, L. R. Bellot Rubio, D. Calchetti, M. Carmona, W. Deutsch, A. Feller, G. Fernandez-Rico, A. Fernandez-Medina, P. Garcia Parejo, J. L. Gasent Blesa, B. Grauf, K. Heerlein, A. Korpi-Lagg, T. Lange, A. Lopez Jimenez, T. Maue, R. Meller, A. Moreno Vacas, R. Mueller, E. Nakai, W. Schmidt, J. Schou, U. Schuehle, J. Sinjan, J. Staub, H. Strecker, I. Torralbo, G. Valori
Summary: In this study, the validity of far-side helioseismic holography is directly assessed using magnetograms obtained by the PHI instrument on the Solar Orbiter. The results show that helioseismic imaging can accurately locate and monitor active regions on the far side of the Sun, including their positions, areas, and average unsigned magnetic field. This provides important evidence for further studying solar magnetic activity.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. Calchetti, M. Stangalini, S. Jafarzadeh, G. Valori, K. Albert, N. Albelo Jorge, A. Alvarez-Herrero, T. Appourchaux, M. Balaguer Jimenez, L. R. Bellot Rubio, J. Blanco Rodriguez, A. Feller, A. Gandorfer, D. Germerott, L. Gizon, L. Guerrero, P. Gutierrez-Marques, J. Hirzberger, F. Kahil, M. Kolleck, A. Korpi-Lagg, A. Moreno Vacas, D. Orozco Suarez, I. Perez-Grande, E. Sanchis Kilders, J. Schou, U. Schuehle, J. Sinjan, S. K. Solanki, J. Staub, H. Strecker, J. C. del Toro Iniesta, R. Volkmer, J. Woch
Summary: In November 2021, Solar Orbiter began its nominal mission phase and gathered scientific data during three observation windows to study magnetohydrodynamic (MHD) wave modes in an active region using the spectropolarimetric capabilities of its instruments. The paper focuses on the analysis of a high-cadence dataset acquired by the High-Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) on board the Solar Orbiter. Various MHD modes at different frequencies are found to be excited in all studied structures, including sunspots and magnetic pores. The measurements from SO/PHI confirm the presence of magnetic and velocity oscillations consistent with MHD wave modes, but further improvements in modeling are needed to fully understand the relationship between different diagnostic fluctuations.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
G. Valori, D. Calchetti, A. Moreno Vacas, E. Pariat, S. K. Solanki, P. Loeschl, J. Hirzberger, S. Parenti, K. Albert, N. Albelo Jorge, A. Alvarez-Herrero, T. Appourchaux, L. R. Bellot Rubio, J. Blanco Rodriguez, A. Campos-Jara, A. Feller, A. Gandorfer, P. Garcia Parejo, D. Germerott, L. Gizon, J. M. Gomez Cama, L. Guerrero, P. Gutierrez-Marques, F. Kahil, M. Kolleck, A. Korpi-Lagg, D. Orozco Suarez, I. Perez-Grande, E. Sanchis Kilders, J. Schou, U. Schuehle, J. Sinjan, J. Staub, H. Strecker, J. C. del Toro Iniesta, R. Volkmer, J. Woch
Summary: This study presents the first application of the stereoscopic disambiguation method (SDM) to observations obtained by the Solar Orbiter, successfully removing the ambiguity in the transverse component of the vector magnetic field. The SDM provides observation-only disambiguated vector magnetograms that are spatially homogeneous and consistent.
ASTRONOMY & ASTROPHYSICS
(2023)
Proceedings Paper
Engineering, Aerospace
F. Kahil, A. Gandorfer, J. Hirzberger, D. Orozco Suarez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodriguez, D. Germerott, L. Guerrero, P. Gutierrez Marquez, J. Sinjan, D. Calchetti, M. Kolleck, S. K. Solanki, J. C. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, J. M. Gomez Cama, I Perez-Grande, E. Sanchis Kilders, M. Balaguer Jimenez, L. R. Bellot Rubio, M. Carmona, W. Deutsch, G. Fernandez-Rico, A. Fernandez-Medina, P. Garcia Parejo, J. L. Gasent Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Korpi-Lagg, T. Lange, A. Lopez Jimenez, T. Maue, R. Meller, H. Michalik, A. Moreno Vacas, R. Muller, E. Nakai, W. Schmidt, J. Schou, U. Schuhle, J. Staub, H. Strecker, I Torralbo, G. Valori
Summary: The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) on-board the Solar Orbiter mission (SO) provides near diffraction limited observations of the solar surface. The HRT Refocus Mechanism (HRM) allows for acquiring calibration data in flight which are used in post-processing on the ground to estimate the image quality of SO/PHI-HRT data products and its dependence on the SO-Sun distance. Our aim is to characterize the wavefront aberrations in the optical path of SO/PHI-HRT and consequently the image quality in the focal plane of the telescope. We use calibration data taken during the Near Earth Commissioning Phase (NECP) and the second Remote Sensing Check-out Window (RSCW2) of Solar Orbiter's Cruise Phase (CP). In particular, we apply a Phase Diversity (PD) analysis to estimate the low-order wavefront aberrations. The restoration with the retrieved Point Spread Function (PSF) from the PD analysis increases the RMS contrast of the solar granulation in the visible continuum from 4% to 10-11%.
SPACE TELESCOPES AND INSTRUMENTATION 2022: OPTICAL, INFRARED, AND MILLIMETER WAVE
(2022)
Proceedings Paper
Astronomy & Astrophysics
Jonas Sinjan, Daniele Calchetti, Johann Hirzberger, David Orozco Suarez, Kinga Albert, Nestor Albelo Jorge, Thierry Appourchaux, Alberto Alvarez-Herrero, Julian Blanco Rodriguez, Achim M. Gandorfer, Dietmar Germerott, Lucas Guerrero, Pablo Gutierrez Marquez, Fatima Kahil, Martin Kolleck, Sami K. Solanki, Jose Carlos del Toro Iniesta, Reiner Volkmer, Joachim Woch, Bjorn Fiethe, Jose Maria Gomez Cama, Isabel Perez-Grande, Esteban Sanchis Kilders, Maria Balaguer Jimenez, Luis R. Bellot Rubio, Manuel Carmona, Werner Deutsch, German Fernandez-Rico, Ana B. Fernandez-Medina, Pilar Garcia Parejo, Jose Luis Gasent Blesa, Laurent Gizon, Bianca Grauf, Klaus Heerlein, Andreas Korpi-Lagg, Tobias Lange, Antonio C. Lopez Jimenez, Thorsten Maue, Reinhard Meller, Harald Michalik, Alejandro M. Moreno Vacas, Reinhard Mueller, Eiji Nakai, Wolfgang Schmidt, Jesper Schou, Udo H. Schuhle, Jan Staub, Hanna Strecker, Ignacio Torralbo, Gherardo Valori
Summary: The ESA/NASA Solar Orbiter successfully launched in February 2020, carrying the Polarimetric and Helioseismic Imager (SO/PHI) instrument. This instrument utilizes differential imaging of polarized light emitted by the Sun to deduce the photospheric magnetic field and line-of-sight velocity. The article presents the architecture of the on-ground pipeline for HRT, which can reduce raw images to the full Stokes vector with a polarimetric sensitivity of 10(-3).I-c or better.
SOFTWARE AND CYBERINFRASTRUCTURE FOR ASTRONOMY VII
(2022)
Article
Environmental Sciences
Stefan Noll, Holger Winkler, Oleg Goussev, Bastian Proxauf
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2020)