# Siberian Radioheliograph: First Results

## TL;DR

The Siberian Radioheliograph's initial observations demonstrate its capability to monitor solar activity with high sensitivity, enabling detection of faint solar events and active processes in the microwave spectrum.

## Contribution

This paper presents the first results from the Siberian Radioheliograph, showcasing its design, capabilities, and initial observations of solar phenomena at microwave frequencies.

## Key findings

- Detection of faint solar events with high sensitivity
- Observation of solar flares and active processes
- Monitoring of solar activity at 4-8 GHz

## Abstract

Regular observations of active processes in the solar atmosphere have been started using the first stage of the multiwave Siberian Radioheliograph (SRH), a T-shaped 48-antenna array with a 4-8 GHz operating frequency range and a 10 MHz instantaneous receiving band. Antennas are mounted on the central antenna posts of the Siberian Solar Radio Telescope. The maximum baseline is 107.4 m, and the angular resolution is up to 70". We present examples of observations of the solar disk at different frequencies, "negative" bursts, and solar flares. The sensitivity to compact sources reaches 0.01 solar flux units ($\approx 10^{-4}$ of the total solar flux) with an accumulation time of about 0.3 s. The high sensitivity of SRH enables monitoring of solar activity and allows studying active processes from characteristics of their microwave emission, including faint events, which could not be detected previously.