Project Summary

"Solar and Stellar Variability" (SOLSTEL) is a four-year scientific project funded by Croatian Science Foundation (project 6212). SOLSTEL connects solar physics, solar-terrestrial physics, heliospheric physics, space weather & climate, geophysics, and stellar physics. It is based on empirical/interpretative, theoretical/analytical, and theoretical/numerical approach, and concerns most of astrophysical problems currently in focus of the research at the Hvar Observatory of the Faculty of Geodesy of the University of Zagreb and the Department of Physics of the University of Rijeka.

SOLSTEL was launched in September 2014 and aims to provide a deeper understanding of various processes in solar and stellar atmospheres, addressing a number of thematic topics, such as: solar activity and eruptive phenomena in the solar atmosphere; solar-activity impact on the Earth; stellar eruptive activity; radiation processes in solar and stellar atmospheres; exoplanets and substellar companions.

For more information on SOLSTEL, please contact the Project Leader.



ERCA 2017 teaching

Written by Jaša Čalogović on .

thumb ERCA-201725th European Research Course on Atmospheres (ERCA) school was organized from 11th January to 9th February 2017 by Universite Joseph Fourier and CNRS in Grenoble, France. ERCA is a high level international course on the Physics and Chemistry of atmospheres, the climate system and climate change, atmospheric pollution at different scales and the human dimensions of environmental changes. The course also covers the solar influences on Earth's atmosphere and climate. This year, altogether 35 students were selected from all around the world to participate in ERCA. Jaša Čalogović was invited to give students two lectures ("Solar variability influences on the climate and cosmic ray - cloud link" and "A critical look at cosmic ray - cloud link: Forbush decreases and cloud cover"). Aim of lectures was to present the influences of solar activity on climate and the possible mechanisms linking solar activity with climate. The cosmic - ray hypothesis was also presented in detail with aim to show several potential problems in present and past studies analyzing geophysical data using correlations.

Seminar at Institute of physics, University of Graz

Written by Jaša Čalogović on .

thumb igamJaša Čalogović visited the Institute of Physics, University of Graz from 5 to 8 July 2016, where he held a seminar "Cosmic rays and clouds: an important climate factor?" in which he presented his previous work, that connects the solar activity and the Earth's climate. During a visit to Graz further collaboration was arranged in order to analyze the impact of coronal holes on the Sun on changes in cosmic ray flux and geomagnetic field of the Earth.

HvaR&D workshop

Written by Bojan Vršnak on .

thumb HvarRD-07 2016Bojan Vršnak participated in a workshop on the curriculum for the facultative secondary-school courses of Geoinformatics, Botany of aromatic and therapeutic flora, and Solar astronomy, which was held in hotel Amfora at Hvar, July 5-6 2016, in the frame of the educational project HvaR&D. In the scope of the Solar astronomy, a collaboration between Hvar secondary school and Hvar Observatory is foreseen.