Starspots, Stellar Cycles and Stellar Flares: Lessons from Solar Dynamo Models
arXiv:1612.02544 · doi:10.1007/s11433-016-0413-7
Abstract
In this review, we discuss whether the present solar dynamo models can be extrapolated to explain various aspects of stellar activity. We begin with a summary of the following kinds of data for solar-like stars: (i) data pertaining to stellar cycles from Ca H/K emission over many years; (ii) X-ray data indicating hot coronal activity; (iii) starspot data (especially about giant polar spots); and (iv) data pertaining to stellar superflares. Then we describe the current status of solar dynamo modelling---giving an introduction to the flux transport dynamo model, the currently favoured model for the solar cycle. While an extrapolation of this model to solar-like stars can explain some aspects of observational data, some other aspects of the data still remain to be theoretically explained. It is not clear right now whether we need a different kind of dynamo mechanism for stars having giant starspots or producing very strong superflares.
arXiv comment30 pages, 16 figures, invited review published in Science China - Physics, Mechanics & Astronomy
References in corpus (35)
- The stellar activity-rotation relationship and the evolution of stellar dynamos
- Magnetic fields of non-degenerate stars
- Predicting solar cycle 24 with a solar dynamo model
- Simulations of dynamo action in fully convective stars
- Detection of Equatorward Meridional Flow and Evidence of Double-Cell Meridional Circulation inside the Sun
- Superflares on Ordinary Solar-Type Stars
- The Dependence of Differential Rotation on Temperature and Rotation
- Can Superflares Occur on Our Sun?
- Magnetic field generation in fully convective rotating spheres
- Persistent Magnetic Wreaths in a Rapidly Rotating Sun
- Solar activity forecast with a dynamo model
- Magnetic Landscape of Sun's Polar Region
- Full--Sphere Simulations of a Circulation--Dominated Solar Dynamo: Exploring the Parity Issue
- Solar-type dynamo behaviour in fully convective stars without a tachocline
- Is a deep one-cell meridional circulation essential for the flux transport Solar Dynamo?
- Meridional circulation in the solar convection zone: time-distance helioseismic inferences from four years of HMI/SDO observations
- The origin of grand minima in the sunspot cycle
- Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
- Differential rotation of main-sequence dwarfs and its dynamo-efficiency
- The connection between stellar activity cycles and magnetic field topology
- Exploring the vs relation with flux transport dynamo models of solar-like stars
- A 3D Babcock-Leighton Solar Dynamo Model
- The Solar-Stellar Connection
- Kinematic active region formation in a three-dimensional solar dynamo model
- Diamagnetic Screening of the Magnetic Field in Accreting Neutron Stars
- Magnetic flux generation and transport in cool stars
- The origin of the solar magnetic cycle
- Studies of grand minima in sunspot cycles from a flux transport solar dynamo model
- Diamagnetic Screening of the Magnetic Field in Accreting Neutron Stars II -- The effect of Polar Cap Widening
- A dynamo model of magnetic activity in solar-like stars with different rotational velocities
- Spot evolution on the red giant star XX Triangulum. A starspot-decay analysis based on time-series Doppler imaging
- Flip-flop phenomenon: observations and theory
- Dynamo model for grand maxima of solar activity: can superflares occur on the Sun?
- The irregularities of the sunspot cycle and their theoretical modelling
- The treatment of magnetic buoyancy in flux transport dynamo models
Cited by in corpus (15)
- Mean field models of flux transport dynamo and meridional circulation in the Sun and stars
- Activity Analyses for Solar-type Stars Observed with Kepler. II. Magnetic Feature Versus Flare Activity
- Characteristic time of stellar flares on Sun-like stars
- A theoretical model of the variation of the meridional circulation with the solar cycle
- Exploring cycle period and parity of stellar magnetic activity with dynamo modeling
- Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey
- A Theoretical Model of the Near Surface Shear Layer of the Sun
- Flux Transport Dynamo: From Modelling Irregularities to Making Predictions
- The GAPS programme at TNG XXVI. Magnetic activity in M stars: spectroscopic monitoring of AD Leonis
- Flaring Activities of Fast Rotating Stars have Solar-like Latitudinal Distribution
- Hemispheric Distribution of Solar Active Regions During Solar Cycles 23-25
- Minimal Data Fidelity for Detection of Stellar Features or Companions
- Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158
- Predicting a solar cycle before its onset using a flux transport dynamo model
- Variations of helioseismic parameters due to magnetic field generated by a flux transport model