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Observation and models of solar and stellar active regions at radio wavelengths (mm/sub-mm)

Abstract

While in the optical, the solar surface shows the presence of dark sunspots (umbra and penumbra), at radio wavelengths those active regions can be brighter than the quiet Sun due to the local atmosphere temperature increase. This temperature increase at radio frequencies can be due to distinct emission mechanisms, usually bremsstrahlung and gyroresonance. Resent results showed that active regions with intense magnetic fields can keep the dark sunspot umbra at mm and sub-mm wavelengths, differing of the classical centimetric observations, that always presented the umbra brighter than the quiet Sun. Make active regions models at mm/sub-mm became very important for the new radio telescopes, like ALMA and LLAMA, which are able to observe the Sun. These models will be also used to investigate the radio emission of active regions of solar type stars, which present darker and colder spots and more intense magnetic fields than the observed on the Sun. (AU)

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Scientific publications (8)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BRAJSA, R.; SKOKIC, I; SUDAR, D.; BENZ, A. O.; KRUCKER, S.; LUDWIG, H-G; SAAR, S. H.; SELHORST, C. L. ALMA small-scale features in the quiet Sun and active regions. Astronomy & Astrophysics, v. 651, JUL 1 2021. Web of Science Citations: 0.
NOWAK, NATALIA; KOWAL, GRZEGORZ; FALCETA-GONCALVES, DIEGO A. Generation and effects of electromotive force in turbulent stochastic reconnection. Physics of Plasmas, v. 28, n. 6 JUN 2021. Web of Science Citations: 0.
KOWAL, GRZEGORZ; FALCETA-GONCALVES, DIEGO A. Colliding-Wind Binaries as a Source of TeV Cosmic Rays. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES, v. 8, MAY 28 2021. Web of Science Citations: 0.
MENEZES, FABIAN; SELHORST, CAIUS L.; GIMENEZ DE CASTRO, CARLOS GUILLERMO; VALIO, ADRIANA. The Subterahertz Solar Cycle: Polar and Equatorial Radii Derived from SST and ALMA. ASTROPHYSICAL JOURNAL, v. 910, n. 1 MAR 2021. Web of Science Citations: 0.
MEDINA-TORREJON, TANIA E.; DE GOUVEIA DAL PINO, ELISABETE M.; KADOWAKI, LUIS H. S.; KOWAL, GRZEGORZ; SINGH, CHANDRA B.; MIZUNO, YOSUKE. Particle Acceleration by Relativistic Magnetic Reconnection Driven by Kink Instability Turbulence in Poynting Flux-Dominated Jets. ASTROPHYSICAL JOURNAL, v. 908, n. 2 FEB 2021. Web of Science Citations: 0.
VALIO, ADRIANA; SPAGIARI, EDUARDO; MARENGONI, MAURICIO; SELHORST, CAIUS L. Correlations of Sunspot Physical Characteristics during Solar Cycle 23. SOLAR PHYSICS, v. 295, n. 9 SEP 3 2020. Web of Science Citations: 0.
SELHORST, CAIUS L.; BARBOSA, CASSIO L.; SIMOES, PAULO; VIDOTTO, ALINE A.; VALIO, ADRIANA. Planetary Transits at Radio Wavelengths: Secondary Eclipses of Hot Jupiter Extended Atmospheres. ASTROPHYSICAL JOURNAL, v. 895, n. 1 MAY 2020. Web of Science Citations: 0.
SELHORST, CAIUS L.; KALLUNKI, JUHA; GIMENEZ DE CASTRO, C. GUILLERMO; VALIO, ADRIANA; COSTA, JOAQUIM E. R. The Solar Radius at 37 GHz Through Cycles 22 to 24. SOLAR PHYSICS, v. 294, n. 12 DEC 16 2019. Web of Science Citations: 0.

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