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Solar Physics

, Volume 283, Issue 2, pp 651–665 | Cite as

POlarization Emission of Millimeter Activity at the Sun (POEMAS): New Circular Polarization Solar Telescopes at Two Millimeter Wavelength Ranges

  • Adriana Valio
  • P. Kaufmann
  • C. G. Giménez de Castro
  • J.-P. Raulin
  • L. O. T. Fernandes
  • A. Marun
Article

Abstract

We present a new system of two circular polarization solar radio telescopes, POEMAS, for observations 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 these high frequencies. The two frequencies were chosen so as to bridge the gap at radio frequencies between 20 and 200 GHz of solar flare spectra. The telescopes, installed at CASLEO Observatory (Argentina), observe the full disk of the Sun with a half power beam width of 1.4, a time resolution of 10 ms at both frequencies, a sensitivity of 2 – 4 K that corresponds to 4 and 20 solar flux unit (=104 Jy), considering aperture efficiencies of 50±5 % and 75±8 % at 45 and 90 GHz, respectively. The telescope system saw first light in 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, indicating the presence of a new spectral component distinct from the microwave one.

Keywords

Flares Polarization: radio Radio bursts: microwaves (mm, cm) Radio emission 

Notes

Acknowledgements

We would like to thank the Brazilian funding agencies FAPESP, CNPq, Mackpesquisa, as well as the Argentine agency CONICET and the American US AFOSR.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Adriana Valio
    • 1
  • P. Kaufmann
    • 1
    • 2
  • C. G. Giménez de Castro
    • 1
  • J.-P. Raulin
    • 1
  • L. O. T. Fernandes
    • 1
    • 2
  • A. Marun
    • 3
  1. 1.CRAAMUniversidade Presbiteriana MackenzieSao PauloBrazil
  2. 2.Universidade Estadual de CampinasCampinasBrazil
  3. 3.CASLEOSan JuanArgentina

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