Multiwave Siberian Radioheliograph

Abstract

The article discusses characteristics, fundamental and applied tasks of the Siberian Radioheliograph that is developed at the ISTP SB RAS Radio Astrophysical Observatory and spectropolarimetric complex that measures the total flux of solar radio emission. The multi-wave mapping of the Sun in the microwave range is a powerful and relatively inexpensive, in comparison with space technologies, means of observing solar activity processes and diagnosing plasma parameters. All-weather monitoring of electromagnetic solar emission (in the range from meter to millimeter waves, including measurements of the solar activity index at 2.8 GHz), and at the location of other diverse diagnostic facilities of the Heliogeophysical Complex, is of particular value. Radioheliograph data is necessary to develop and implement methods of short-term forecast of solar flares, measurements of kinematics and characteristics of coronal mass ejection plasma, forecast of characteristics of fast solar wind streams.

Calibration of Siberian Radioheliograph antenna gains using redundancy

“…When designing the Siberian Radio Heliograph (SRH) [Altyntsev et al, 2020] and its 48-antenna prototype (SRH-48) [Lesovoi et al, 2012;Lesovoi et al, 2017], it was taken into account that it is impossible to observe point sources because of insufficient sensitivity, and self-calibration is difficult when observing the quiet Sun as it requires selecting a model of brightness distribution over the solar disk. For these reasons and in view of the existing infrastructure of the Siberian Solar Radio Telescope (SSRT) [Grechnev, 2003], redundant T-shaped array configurations were chosen.…”