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POlarization Emission of Millimeter Activity at the Sun (POEMAS): new circular polarization solar telescopes at two millimeter wavelength ranges  

Adriana Valio   Submitted: 2012-10-31 14:56

We present a new system of two circular polarization solar radio telescopes, POEMAS, for observation of the Sun at 45 and 90 GHz. The novel characteristic of these instruments is the capability to measure circular right and left hand polarizations at such high frequencies. The two frequencies were chosen so as to bridge the gap at radio frequencies between 20 and 200 GHz of solar flares spectra. The telescopes, installed at CASLEO Observatory (Argentina), observe the full disk of the Sun with HPBW of 1.4 degree, time resolution of 10 ms at both frequencies, sensitivity of 2-4 K,that corresponds to 4 and 20 SFU, considering aperture efficiencies of 50 ? 5% and 75 ? 8% at 45 and 90 GHz respectively. The telescopes system saw first light on November 2011 and is satisfactorily operating daily since then. A few flares were observed and are presented here. The millimeter spectra of some flares are seen to rise toward higher frequencies maybe indicating the presence of a new spectral component distinct from the microwave one.

Authors: Adriana Valio, P. Kaufmann, C.G. Giménez de Castro, J.-P. Raulin, L.O.T. Fernandes, A. Marun
Projects: None

Publication Status: Solar Physics (submitted)
Last Modified: 2012-10-31 14:56
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POlarization Emission of Millimeter Activity at the Sun (POEMAS): new circular polarization solar telescopes at two millimeter wavelength ranges

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