Stellar activity cycles from brightness variations
Seismological insights into solar and stellar magnetic activity cycles
... Sun’s activity cycle varies primarily on a timescale of 11 ...solar activity on the solar sur- face is sunspots and the number of sunspots is known to track the solar ...sunspot cycles vary ...
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The connection between stellar activity cycles and magnetic field topology
... 16 Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA 11 August 2016 ABSTRACT Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of ...
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The connection between stellar activity cycles and magnetic field topology
... temporal variations while stars exclusively on the inactive branch remain dominantly poloidal throughout their entire ...obtained from ZDI and activity ...
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The connection between stellar activity cycles and magnetic field topology
... tor variations over their activity cycle despite having Ro & ...and activity cycle period determinations, especially de- terminations of true magnetic cycle periods, will be needed before our ...
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Stellar magnetism and activity : from stellar interiors to orbiting exoplanets
... An explanation for the differing magnetic topologies on each branch may lie in the dy- namos of these stars. It is thought that strong shearing, i.e. an Ω -effect, can generate toroidal field from a poloidal ...
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Chromospheric activity catalogue of 4454 cool stars: questioning the active branch of stellar activity cycles
... Chromospheric activity monitoring of a wide range of cool stars can provide valuable information on stellar magnetic activ- ity and its dependence on fundamental stellar parameters such as effective ...
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Prediction of Solar Activity from Solar Background Magnetic Field Variations in Cycles 21-23
... in cycles 21–23 and the sunspot magnetic field in cycle 23 reported in our recent paper showed the presence of two principal components (PCs) of SBMF having opposite polarity, ...odd cycles 21 and 23 and to ...
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Prediction of solar activity from solar background magnetic field variations in cycles 21-23
... in cycles 21–23 and the sunspot magnetic field in cycle 23 reported in our recent paper showed the presence of two principal components (PCs) of SBMF having opposite polarity, ...odd cycles 21 and 23 and to ...
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Constraining stellar physics from red-giant stars in binaries – stellar rotation, mixing processes and stellar activity
... Figure 4: Analysis of the long periodic light curve modulation of KIC9163796 in the period range between 20 and 200 days. The left panel depicts the wavelet analysis of the full time series in period space. Period ...
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Disentangling stellar activity from exoplanetary signals with interferometry
... 2 Stellar parameters : determination and limitations Several methods are used to estimate stellar ...suring stellar oscillation frequencies, which gives access to stellar gravity, radius, and ...
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Stellar magnetic activity and exoplanets
... and stellar mass, with the sketch presented in Figure 1 representing a cut of a multi-dimensional func- ...lar activity are their relatively large ...of stellar activity and not only due to ...
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The relation between stellar magnetic field geometry and chromospheric activity cycles - I. The highly variable field of Eps Eridani at activity minimum
... chromospheric activity cycle of about 3 ...strong variations at yearly ...its activity cycle, we focus on high-cadence observations spanning 5 months at its activity ...emerges from its ...
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Disentangling stellar activity and planetary signals
... RV variations are dominated by the activity of the star with an estimated period of 23 ...model from the RV data before to detect and characterize the planetary ...of activity and the ...
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The relation between stellar magnetic field geometry and chromospheric activity cycles – II. The rapid 120-day magnetic cycle of τ Bootis
... 3, from 23 per cent in Map 1, though this could result from the suboptimal phase coverage, to 55 per cent in Map ...at activity maximum which then ...switch, from 57 per cent in Map 2 to 63 ...
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The relation between stellar magnetic field geometry and chromospheric activity cycles II The rapid 120 day magnetic cycle of τ Bootis
... 3, from 23 per cent in Map 1, though this could result from the suboptimal phase coverage, to 55 per cent in Map ...at activity maximum which then ...switch, from 57 per cent in Map 2 to 63 ...
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Seismic signatures of stellar magnetic activity — what can we expect from TESS?
... investigate stellar activity and activity cycles as well as to identify those properties of stars which are crucial for the operation of stellar ...data from CoRoT and Kepler, ...
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Two new long-period giant planets from the McDonald Observatory planet search and two stars with long-period radial velocity signals related to stellar activity cycles
... the activity signal of several m s −1 aresomewhat unexpected, especially for the relatively inactive star ...an activity cycle of the star HD 200466A, whichproduces an RV signal with a semiamplitude of ...
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Brightness variations of the northern 630 nm intertropical arc and the midnight pressure bulge over Eritrea
... taken from Asmara, Eritrea just 7 ◦ north of the magnetic dip equator in eastern ...a brightness decrease at midnight, a strong and persistent post-midnight brightness maximum, and termination ...
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Variations in Solar Cycles 22, 23 & 24 and Their Effect on Earth’s Climate
... human activity in the atmosphere and this is the cause of global warming ...climate from human and natural sources [6]-[8], having proposed that the mechanism is caused by the ionizing effect of cosmic rays ...
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Effect of stellar activity on the high precision transit light curve
... behavior from that of the transit anomaly amplitude in term of its ...0.7 stellar radii from the center of the ...on variations in transit timing, one can only focus on this area where the TTV ...
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