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Kick-off of the H2020 SOLARNET II project

The kick-off metting of the SOLARNET II project was held on January 24th 2019. This project aims at integrating the major European infrastructures in the field of high-resolution solar physics in view of the realization of the European Solar Telescope (EST). The SOLARNET II project will be conducted over the next 4 years, involving 36 partners from 16 countries.

EST is a next generation solar telescope that the the European solar physics community plans to build in the Canary Islands. The project is managed by the European Association for Solar Telescopes (EAST), which was founded in 2006 and now includes members from 18 European nations. Switzerland is represented in the EAST by IRSOL. Since 2016, EST has been part of the European Strategy Forum on Research Infrastructures (ESFRI), a strategic instrument dedicated to develop the scientific integration of Europe.

The Swiss participation in SOLARNET is quite significant, the main participant being Università della Svizzera italiana (USI), while IRSOL and Swiss National Supercomputing Center (CSCS) are third parties. The Haute Ecole d’Ingénierie et de Gestion du Canton de Vaud (HEIG-VD) is also participating to the project.
The contribution of these institutions can be summarized as follows.
The Piz Daint Supercomputer at CSCS will be made available to the solar community to promote numerical investigations of the solar atmosphere, including magneto-hydrodynamic and radiative transfer simulations.
USI and IRSOL will organize a summer school under the title “Solar
spectropolarimetry: From real to virtual observations“. IRSOL is also working on an innovative technology capable of performing high precision absolute polarimetry with low systematic errors. Finally, the HEIG-VD is involved in the work package devoted to the development of a high-performing adaptive optics device.

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CSCS and IRSOL present their computational activities at the RSI radio

Wednesday 23th January at 11 am, the Millevoci broadcast at RSI was dedicated to the presentation of the computational activities at the Swiss Center for Scientific Computing (CSCS), bringing as an example the collaboration with the IRSOL in the field of solar physics numerical simulations.

Research at IRSOL currently is based on 3 pillars: telescope observations, theory and numerical simulations. The latter have been able to benefit in these last years of machine time at the powerful computer Piz Daint of the CSCS. In the computational field, projects were also started in collaboration with the Institute of Computational Sciences (ICS) at the Università della Svizzera italiana (USI), with the Institute of Astrophysics of the Canary Islands (IAC) and with the Kiepenheuer Institut für Sonnenphysik (KIS) in Freiburg. International collaborations have grown in importance and this year culminated with the launch of a European H2020 project called Solarnet, carried out by a European consortium which includes IRSOL, CSCS and ICS through the USI. The main purpose of Solarnet is to make available to the scientific community, the major European infrastructures and to foster their collaboration and exchange of expertise in view of the projected construction of the European Solar Telescope (EST) on the Canary Islands. Among the main activities that will take place in Ticino in the context of Solarnet we mention: computation time made available to the European scientific community at the CSCS; the implementation at IRSOL of an innovative technique for the absolute polarization measurement and the organization of a summer school in collaboration with the ICS dedicated to computational techniques in solar physics.

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Archiving project of Specola Solare Ticinese sunspot drawings in collaboration with ETH-Zurich University Archives and GCOS

Thanks to its high correlation with the total solar irradiance, the Sunspot Number (SSN), which represents a 400 years long observational data series, was recently recognized in the latest implementation plan of the Global Climate Observing System (GCOS) as valuable information for climate studies. In Switzerland systematic observations of sunspots started in 1847 by Rudolf Wolf, first in Bern and then at the Federal Observatory in Zurich. Its former external observing station Specola Solare in Locarno, built in 1957, became in 1981 the reference station of the SSN, at the same time when the world data center was transferred from Zurich to the Royal Observatory in Brussels at SILSO.

To ensure that the historical sunspot drawings and data of Specola Solare are archived in the long run, MeteoSwiss in the framework of GCOS Switzerland has decided to support the archiving and digitization of these drawings and data at the ETH Library in Zurich. The project is a joint effort by the Associazione Specola Solare Ticinese (ASST) in Locarno and the ETH Zurich and runs for 5 years.

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SNSF Sinergia project involving IRSOL, USI, and IAC approved

The Swiss National Science Foundation (SNSF), within the framework of the “Sinergia” financing programme, has approved a cooperation project involving IRSOL, the Institute of Computational Sciences of Università della Svizzera italiana (USI), and the Instituto de Astrofisica de Canarias (IAC) in Tenerife (Spain).
The project, with title “HPC-techniques for 3D modeling of resonance line polarization with PRD”, aims at developing new numerical methods necessary for modeling the intensity and polarization of the solar radiation from three-dimensional (3D) models of the atmosphere of the Sun, taking partial frequency redistribution (PRD) phenomena into account.
The possibility to carry out such theoretical modeling represents a key step towards the development of new reliable diagnostic techniques for investigating the magnetism of the chromosphere and transition region. This problem is far from trivial, especially from the computational point of view, and indeed it requires merging competences in solar physics, in the theory of the generation and transfer of polarized radiation, and in computational sciences.
The project will allow us to offer a post-doctoral position of four years in each one of the institutes involved, plus a PhD position at the Università della Svizzera italiana (USI).
The contracts will start between the end of 2018 and the first months of 2019.

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New entry in the data archive: Atlas of the Third Solar Spectrum and its Center to Limb Variation

The IRSOL data archive includes now a new entry:  the Atlas of the Third Solar Spectrum and its Center to Limb Variation.  

The spectroscopic data were obtained from an observing project at the IRSOL Gregory-Coudé telescope that lasted few years. The involved authors were M. Setzer, R. Ramelli, M. Engelhard, M.Bianda, F. Paglia, J.O. Stenflo, G. Küveler and R. Plewe.

The atlas of the Third Solar Spectrum (SS3) represents the ratio between the intensity spectrum at different distances from the solar limb and the intensity spectrum at disk center (µ = 1.0), both in units of the intensity of the local continuum level.  The observing positions of the measurements cover 9 different µ values along the solar axis ranging from 0.1 to 0.9 in step of 0.1, where  µ=cosθ  is the cosinus  of the heliocentric angle θ. The current version of the atlas covers the wavelength range from 4384Å  to 6610Å.

The atlas can be found at the URL:

http://www.irsol.usi.ch/data-archive/clv-ss3/