Results 11 to 20 of about 285,532 (266)
ACTIVITY-BRIGHTNESS CORRELATIONS FOR THE SUN AND SUN-LIKE STARS [PDF]
The Astrophysical Journal, 2011 We analyze the effect of solar features on the variability of the solar irradiance in three different spectral ranges. Our study is based on two solar-cycles' worth of full-disk photometric images from the San Fernando Observatory, obtained with red, blue and Ca II K-line filters.
Preminger, Dora +2 more
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Incoherent Solar Radio Emission
Frontiers in Astronomy and Space Sciences, 2020 Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions.
Alexander Nindos
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Active Latitude Oscillations Observed on the Sun [PDF]
Solar Physics, 2016 Accepted for publication by Solar ...
Kilcik, Ali +4 more
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THE ORIGIN OF ENHANCED ACTIVITY IN THE SUNS OF M67 [PDF]
The Astrophysical Journal, 2009 We report the results of the analysis of high resolution photospheric line spectra obtained with the UVES instrument on the VLT for a sample of 15 solar-type stars selected from a recent survey of the distribution of H and K chromospheric line strengths in the solar-age open cluster M67.
Reiners, Ansgar, Giampapa, Mark S.
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Subarcsecond Imaging of a Solar Active Region Filament With ALMA and IRIS
Frontiers in Astronomy and Space Sciences, 2022 Quiescent filaments appear as absorption features on the solar disk when observed in chromospheric lines and at continuum wavelengths in the millimeter (mm) range. Active region (AR) filaments are their small-scale, low-altitude analogues, but they could
J. M. da Silva Santos +6 more
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Solar neutrinos as indicators of the Sun’s activity [PDF]
International Journal of Modern Physics A, 2019 Opportunity of the solar flares (SFs) prediction observing the solar neutrino fluxes is investigated. In three neutrino generations, the evolution of the neutrino flux traveling the coupled sunspots (CSs) which are the SF source is considered. It is assumed that the neutrinos possess both the dipole magnetic moment and the anapole moment while the ...
O. M. Boyarkin, I. O. Boyarkina
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Complex Network in Solar Features [PDF]
Iranian Journal of Astronomy and AstrophysicsThis paper is an overview of studying the solar features in a complex network approach. First, we introduce the structural features of complex networks and important network parameters.
Somayeh Taran
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Statistical Analysis of Magnetic Patches in Solar Active Regions using the Complex Network Method [PDF]
Iranian Journal of Astronomy and AstrophysicsIdentifying solar active regions (ARs), which consist of one or more pairs of magnetic patches with opposite polarities, is essential due to their significant role in dynamic solar atmospheric phenomena such as solar flares and coronal mass ejections. In
Zahra Tajik +3 more
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Probing the rotation rate of solar active regions: the comparison of methods
Open Astronomy, 2022 Sunspot groups are often used as tracers to probe the differential rotation of the Sun. However, the results on the rotation rate variation obtained by different authors are not always in agreement. The reason for this might be a number of effects.
Kutsenko Alexander S. +1 more
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Faculae Cancel out on the Surfaces of Active Suns
The Astrophysical Journal Letters, 2022 Abstract Surfaces of the Sun and other cool stars are filled with magnetic fields, which are either seen as dark compact spots or more diffuse bright structures like faculae. Both hamper detection and characterization of exoplanets, affecting stellar brightness and spectra, as well as transmission spectra.
Nèmec, N.-E. +15 more
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