The 64-m Sardinia Radio Telescope provides solar imaging in the 18-26 GHz range by the 7 feeds K-band receiver. Observations are processed through full-stokes spectral-polarimetric ROACH-based back-end (SARDARA system, 1.5 GHz bandwidth).
Solar Imaging observations at SRT require special harware configuration in order to attenuate the strong solar signal in the amplification chain. At present, the need of manual setup of additional hardware (10dB attenuation for the 14 multi-feed chains) at each solar observing session, restrict the use of SRT to a few solar sessions/year. A remote-controlled attenuation level setup is under development and it will permit a quick and smart switching from standard operations to solar observing mode ("solar agility") allowing more frequent observations.
The high dynamic range of the SARDARA spectro-polarimeter (not yet available for the Medicina 32-m) allow us to detect both the solar disk (chromospheric emission) and the corona in the same image.
The adopted observing techinque is similar to that in use with Medicina 32-m: On-The-Fly (OTF) scans providing full solar mapping (both radio telescopes use the DISCOS antenna control system).
We are presently testing the optimal (multi-feed) solar mapping parameters for SRT in the frequency range 18-26 GHz. The corresponding beam size in this range is 1.0-0.7 arcmin.