• Solar disk in white-light March 24 2024

    Solar disk in white-light March 24 2024

    Image of the solar disk taken on March 24, 2024. A huge group of sunspots is located almost in the central part of the solar disk. It is over 10 times the Earth’s diameter. The image was obtained with observation equipment that will be used during the total solar eclipse on April 8, 2024. A…

  • How it started

    How it started

    In 1899, five years after establishing the first Bulgarian astronomical observatory in Sofia,Marin Bachevarov started regular sunspot observations with his students with the foremost telescope in Bulgaria – a 6-inch refractor [1] . In the mid-XXth century Angel Bonov lays the foundation of solar physics in Bulgaria with hisstudies on the 22- [2] , 44-…

  • 30-cm eye to the chromosphere

    30-cm eye to the chromosphere

    A new solar telescope is about to be established in the solar tower at National Astronomical Observatory Rozhen, Bulgaria (41° 41’51″; N 24° 44’19″; E, 1759 m). The telescope is currently under construction and is expected to receive its first light in 2022. The 30-cm Schmidt-Cassegrain reflector is going to be focused on chromospheric observations.…