  The first 48-antenna stage of the Siberian Radioheliograph (SRH) started
single-frequency test observations early in 2016, and since August 2016 it
routinely observes the Sun at several frequencies in the 4-8 GHz range with an
angular resolution of 1-2 arc minutes and an imaging interval of about 12
seconds. With limited opportunities of the incomplete antenna configuration, a
high sensitivity of about 100 Jy allows the SRH to contribute to the studies of
eruptive phenomena along three lines. First, some eruptions are directly
visible in SRH images. Second, some small eruptions are detectable even without
a detailed imaging information from microwave depressions caused by screening
the background emission by cool erupted plasma. Third, SRH observations reveal
new aspects of some events to be studied with different instruments. We focus
on an eruptive C2.2 flare on 16 March 2016 around 06:40, one of the first
flares observed by the SRH. Proceeding from SRH observations, we analyze this
event using extreme-ultraviolet, hard X-ray, white-light, and metric radio
data. An eruptive prominence expanded, brightened, and twisted, which indicates
a time-extended process of the flux-rope formation together with the
development of a large coronal mass ejection (CME). The observations rule out a
passive role of the prominence in the CME formation. The abrupt prominence
eruption impulsively excited a blast-wave-like shock, which appeared during the
microwave burst and was manifested in an "EUV wave" and Type II radio burst.
The shock wave decayed and did not transform into a bow shock because of the
low speed of the CME. Nevertheless, this event produced a clear proton
enhancement near Earth. Comparison with our previous studies of several events
confirms that the impulsive-piston shock-excitation scenario is typical of
various events.
