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Center-to-Limb Variation of Solar Bursts Polarization at Millimeter Wavelengths

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Abstract

Polarization of radio emission from solar flares provides essential information about plasma regimes confined to magnetic field in quiescent, pre-explosion, sudden energy release and decay phases. Observations of polarization are carried out continuously by the first time at two millimeter wavelengths of 6.67 and 3.34 mm (45 and 90 GHz, respectively) by two solar radio polarimeters named POEMAS operating at El Leoncito Observatory, Argentinian Andes. A total of 30 solar flares observed by the radio polarimeters, between 2012 and 2013, were analyzed. The degree of polarization was observed to increase and then decrease as the heliocentric angle increased. We found a weak correlation between the bursts’ flux density and their heliocentric angle, i.e. solar bursts with higher flux density slightly tend to occur near the limb.

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Acknowledgements

This research was partially supported by agencies FAPESP (Proc. #13/24155-3), Mackpesquisa, CNPq, CAPES, and U.S. AFOSR. RFHR would like to thank Prof. Pierre Kaufmann (1938 – 2017), pioneer of Radio-Astronomy in Brazil and founder of the Center of Radio Astronomy and Astrophysics Mackenzie, for the invaluable discussions about Radio Astronomy, his legacy keeps our spirits inspired to think big. We are indebted to him. RFHR thanks his colleague Yuri Netto for his contribution to this paper. The authors would like to thank the anonymous referee for the important comments.

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  1. Center of Radio Astronomy and Astrophysics Mackenzie, Engineering School, Mackenzie Presbyterian University, São Paulo, Brazil

    R. F. Hidalgo Ramírez, A. Morosi, D. Silva, P. J. A. Simoẽs & A. Valio

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  1. R. F. Hidalgo Ramírez
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  2. A. Morosi
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  3. D. Silva
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  4. P. J. A. Simoẽs
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  5. A. Valio
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Correspondence to R. F. Hidalgo Ramírez or A. Valio.

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Hidalgo Ramírez, R.F., Morosi, A., Silva, D. et al. Center-to-Limb Variation of Solar Bursts Polarization at Millimeter Wavelengths. Sol Phys 294, 108 (2019). https://doi.org/10.1007/s11207-019-1503-x

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