Prof. Petr Heinzel

Astronomical Institute, Czech Academy of Sciences

v četrtek, 11. junija 2015, ob 14. uri v predavalnici F2 (Jadranska 19, Ljubljana)

Solar coronagraphs are special telescopes designed to observe the corona and various coronal structures (e.g. prominences) out of solar eclipses. Most efficient are the space coronagraphs, where the observations are not influenced by the Earth atmosphere. I will briefly review previous coronagraphic missions of ESA (European Space Agency) and show some new results obtained with one of them, namely UVCS on board of the SOHO satellite. These results concern large solar eruptions called Coronal Mass Ejections (CME) and their spectroscopic diagnostics. ESA is currently developing two new space coronagraphs, METIS for Solar Orbiter mission (launch 2018) and ASPIICS for Proba-3 mission (launch 2018). The latter one is particularly interesting because it will simulate, for the first time, a total solar eclipse from space.

Finally, I will also mention how CME’s can be detected on other active stars, with their potential influence on exoplanets.