Fig. 1.
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Solar disk image at 18.3 GHz (left) and 25.8 GHz (right) obtained with the Grueff Radio Telescope on June 13, 2019, processed with the SUNDARA package (Marongiu et al. 2021). The colour bars indicate TB of the solar maps in units of Kelvin. The green circles in the lower left corner of each map mark the HPBW at the observed frequencies.
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