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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Hidalgo Ramirez, R. F. [1] ; Morosi, A. [1] ; Silva, D. [1] ; Simoes, P. J. A. [1] ; Valio, A. [1]
Total Authors: 5
[1] Univ Prebiteriana Mackenzie, Sch Engn, Ctr Radio Astron & Astrophys Mackenzie, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SOLAR PHYSICS; v. 294, n. 8 AUG 2019.
Web of Science Citations: 0

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. (AU)

FAPESP's process: 13/24155-3 - Solar flare diagnostic in an unprecedented frequency range from microwaves to THz frequencies: challenges for interpretation (flat)
Grantee:Carlos Guillermo Giménez de Castro
Support type: Research Projects - Thematic Grants