High-Resolution Imaging of the Solar Chromosphere in the Centimetre-Millimetre Band Through Single-Dish Observations
2018
Solar observationsoffer both a rich interdisciplinary laboratory on fundamental astrophysics and precious tools for
Space Weatherapplications. The involved
plasma processesdetermine a complex and partially unknown radio emission picture that could be efficiently explored through single-dish imaging at high frequencies. In particular, mapping the
brightness temperatureof the free-free radio emission in the centimetre and millimetre range is an effective tool for characterising the vertical structure of the solar
chromosphere. We are planning to perform continuum imaging of the solar
chromospherein
K-band(18-26.5 GHz) with the 32-m diameter Medicina
radio telescopeand with the 64-m diameter Sardinia
Radio Telescope(SRT), as a first
scientific demonstrationtest for the potentialities of Italian single-dish antennas in this field. This will also be useful for the assessment of observation parameters aiming at studying in detail the
chromospheric
brightness temperatureof the quiet Sun, the
solar flaresand the sunspots. In perspective, this study will contribute to
Space Weathermonitoring networks and forecast, filling different gaps that presently exist in the worldwide observing scenario. We present preliminary tests of single-dish solar imaging at 24 GHz with the Medicina 32-m
radio telescope. These observations proved that our antenna and
K-bandreceiver are stable during solar pointing and could provide full mapping of the solar disk in ∼1 hour exposure using state-of-the-art imaging techniques.
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