The Subterahertz Solar Cycle: Polar and Equatorial Radii Derived from SST and ALMA

0553768 - ASÚ 2022 RIV GB eng J - Článek v odborném periodiku
Menezes, F. … celkem 4 autorů
The Subterahertz Solar Cycle: Polar and Equatorial Radii Derived from SST and ALMA.
Astrophysical Journal. Roč. 910, č. 1 (2021), č. článku 77. ISSN 0004-637X. E-ISSN 1538-4357
Výzkumná infrastruktura: EU-ARC.CZ II - 90106
Klíčová slova: solar atmosphere * solar radio emission * center to limb observations
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.521, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/abe41c

In this work, we use data from the Solar Submillimeter-wave Telescope (SST) and the Atacama Large Millimeter/submillimeter Array (ALMA) at frequencies of 100, 212, 230, and 405 GHz to measure the equatorial and polar radii of the Sun. The radii measured with extensive data from the SST agree with the radius-versus-frequency trend present in the literature. The radii derived from ALMA maps at 230 GHz also agree with the radius-versus-frequency trend, whereas the 100 GHz radii are slightly above the values reported by other authors. In addition, we analyze the equatorial and polar radius behavior over the years by determining the correlation coefficient between solar activity and subterahertz radius time series at 212 and 405 GHz (SST). The variations of the SST-derived radii over 13 yr are correlated to the solar activity when considering equatorial regions of the solar atmosphere and anticorrelated when considering polar regions. The ALMA-derived radius time series for 100 and 230 GHz show very similar behaviors with those of SST.
Trvalý link: http://hdl.handle.net/11104/0328492