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Photospheric and chromospheric observations with solar telescope at Hvar Observatory

The double solar telescope at the Hvar Observatory consists of two Carl Zeiss refractors, one with 217 mm objective diameter used for photospheric observations and the second one with 130 mm objective used for chromospheric observations. Hvar solar telescope aims to produce the high-resolution and high-cadence imaging of active regions on the Sun using a field of view of about 11 arcmin for the photosphere and 7 arcmin for the chromosphere. The modern Pulnix TM-4200GE 12-bit 4 megapixel CCD cameras recording seven frames per second together with the software that automatically selects the sharpest frames allow to study the rapid changes on the Sun in great detail. High-cadence ground-based observations are an important tool to identify and study solar flares, filaments and other solar phenomena that are associated with coronal mass ejections and their propagation to the Earth. Aiming to improve the space weather forecasts using ground-based observations, we compiled the catalogue of Hvar solar telescope observations in the solar cycle 24. In addition, expansion of this catalogue in future will be used for comparison with ALMA-SSALMON observations. This work has been supported by the Croatian Science Foundation project 6212 "Solar and Stellar Variability" (SOLSTEL).

solar telescope, Hvar Observatory

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