engleski

PHOTOSPHERIC AND CHROMOSPHERIC OBSERVATIONS AT HVAR OBSERVATORY

The double solar telescope at Hvar Observatory consists of two refractors, one with 217 mm objective diameter used for photospheric observations, and the second one with 130 mm objective used for chromospheric observations. The aim of the Hvar solar telescope is to produce 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 Pulnix TM-4200GE 12-bit 4 megapixel CCD cameras recording seven frames per second together with the software that automatically selects the sharpest frames during the periods of good seeing, 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 (CME) and their propagation towards Earth. Aiming to improve the space weather forecasts by using ground-based observations, we present the catalogue of Hvar solar telescope observations in the last solar cycle 24. A future expans

solar observation, photosphere, chromosphere

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