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.



ISSI workshop in Bern

Written by Jaša Čalogović on .

thumb ISSI meeting 2018From April 8 to 13, 2018 Bojan Vršnak attended the International Team Meeting of the team Manuel Luna: "Large-Amplitude Oscillations as a Probe of Quiescent and Erupting Solar Prominences", held at the International Space Science Institute (ISSI) in Bern, Switzerland. Bojan Vršnak tasks were related to the oscillations of prominence-carrying magnetic flux ropes, implications for the stability and loss of equilibrium. He also gave a talk on physical background of prominence oscillations entitled "Coronal and Prominence Diagnostics based on Prominence Oscillations".

Public lecture about solar eruptive activity

Written by Jaša Čalogović on .

thumb HPD Vrsnak2018On March 22, 2018, Bojan Vršnak gave a public lecture on the physical background of eruptive processes on the Sun. The lecture held at the public library "Bogdan Ogrizović" was organized by Croatian Natural Society (Hrvatsko prirodoslovno društvo, HPD). In the lecture entitled "Solar Eruptive Activity" (Sunčeva eruptivna aktivnost), he presented basic mechanisms that cause various forms of solar eruptions, their space-weather consequences and effects in geospace. Pictures from lecture are available here

Space weather lecture at Croatian Academy of Sciences and Arts

Written by Jaša Čalogović on .

thumb HAZU Vrsnak2018On January 24, 2018, Bojan Vršnak gave a public lecture on the space weather, organized by Croatian Academy of Sciences and Arts and Croatian Science Foundation, on the occasion of receiving the international award Kristian Birkeland Medal for Space Weather and Space Climate. In the lecture entitled "Influence of Solar Activity on the Earth", he presented the history and basic objectives of space-weather, as well as the related research activity at the Hvar Observatory.

ERCA school 2018

Written by Jaša Čalogović on .


26th European Research Course on Atmospheres (ERCA) school was organized from 7th January to 3rd February 2018 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 the Earth's atmosphere and climate. Altogether 30 students from different countries worlwide were selected to participate in ERCA. Dr. sc. Jaša Čalogović was again 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 the solar activity with climate. Second lecture was focused on the cosmic ray - cloud hypothesis with aim to show several potential problems in present and past studies that analyzed climate and geophysical data using the simple correlations.

Dr. Bojan Vršnak received the eminent international prize for outstanding scientific research in the field of space weather

Written by Jaša Čalogović on .

ESWW14-Bojan-01On Monday, November 27, 2017, during the 14th European Space Weather Week, held in the Belgian town Oostende, Dr. Bojan Vršnak was awarded with the eminent international award "Kristian Birkeland Medal" for outstanding scientific contributions to the space weather and space climate. This award is given every year since 2013 to the best scientists by the European Space Agency, the Belgian Solar-Terrestrial Center of Excellence and the Space Weather Working Team, in collaboration with the scientific magazine Journal of Space Weather and Space Climate.