Photospheric and Subphotospheric Dynamics of Emerging Magnetic Flux

@article{Kosovichev2009PhotosphericAS,
  title={Photospheric and Subphotospheric Dynamics of Emerging Magnetic Flux},
  author={Alexander G. Kosovichev},
  journal={Space Science Reviews},
  year={2009},
  volume={144},
  pages={175-195}
}
  • A. Kosovichev
  • Published 31 December 2008
  • Physics
  • Space Science Reviews
Magnetic fields emerging from the Sun’s interior carry information about physical processes of magnetic field generation and transport in the convection zone. Soon after appearance on the solar surface the magnetic flux gets concentrated in sunspot regions and causes numerous active phenomena on the Sun. This paper discusses some properties of the emerging magnetic flux observed on the solar surface and in the interior. A statistical analysis of variations of the tilt angle of bipolar magnetic… Expand
Center-limb dependence of photospheric velocities in regions of emerging magnetic fields on the Sun
We investigate the ratio of the vertical and horizontal velocities of the photospheric plasma flows in the region of emerging magnetic fields on the Sun. We carried out a study of photosphericExpand
The Origin and Early Evolution of a Bipolar Magnetic Region in the Solar Photosphere
Finding the formation mechanisms for bipolar configurations of strong local magnetic field under control of the relatively weak global magnetic field of the Sun is a key problem of the physics ofExpand
The dynamics of photospheric line-of-sight velocities in emerging active regions
The emergence of photospheric magnetic fields and the dynamics of the associated pattern of vertical motions in a developing active region are studied based on SOHO/MDI data. Objects were selectedExpand
A low upper limit on the subsurface rise speed of solar active regions
TLDR
It is shown that measurements of horizontal flows at the solar surface around emerging active regions, in combination with numerical simulations of solar magnetoconvection, can constrain the subsurface rise speed of emerging magnetic flux. Expand
Detection of the Horizontal Divergent Flow prior to the Solar Flux Emergence
It is widely accepted that solar active regions including sunspots are formed by the emerging magnetic flux from the deep convection zone. In previous numerical simulations, we found that theExpand
Emerging and Decaying Magnetic Flux and Subsurface Flows
We study the temporal variation of subsurface flows of 788 active regions and 978 quiet regions. The vertical-velocity component used in this study is derived from the divergence of the measuredExpand
Reconstruction of Solar Subsurfaces by Local Helioseismology
Local helioseismology has opened new frontiers in our quest for understanding of the internal dynamics and dynamo on the Sun. Local helioseismology reconstructs subsurface structures and flows byExpand
Observational Evidence of Shallow Origins for the Magnetic Fields of Solar Cycles
Observational evidence for the origin of active region magnetic fields has been sought from published information on extended solar cycles, statistical distributions of active regions and ephemeralExpand
Radial profile of sunspot magnetic field on the SDO data
The spatial distribution of the vertical (with respect to the surface photosphere) magnetic field in a sunspot plays an important role in modeling the temperature-density characteristics of sunspot,Expand
Development of Active Regions: Flows, Magnetic-Field Patterns and Bordering Effect
A qualitative analysis is given of the data on the full magnetic and velocity vector fields in a growing sunspot group, recorded nearly simultaneously with the Solar Optical Telescope on the HinodeExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 61 REFERENCES
TILT OF EMERGING BIPOLAR MAGNETIC REGIONS ON THE SUN
Magnetic fields emerging from the Sun's interior carry information about the physical processes of magnetic field generation and transport in the convection zone. A statistical analysis of variationsExpand
Sunspot rotation and the field strengths of subsurface flux tubes
Observations show that bipolar magnetic regions (BMRs) have differential rotation profiles that are faster than the local Doppler velocity profiles by about 5%, and thep-spots in the growing sunspotExpand
Dynamics of emerging active region flux loops
The buoyant rise of a magnetic flux loop arising from a single perturbed segment of a toroidal flux ring lying slightly beneath the base of the convection zone is studied by way of numericalExpand
Flux tubes, surface magnetism, and the solar dynamo: constraints and open problems
The flux-tube paradigm has proven to be a remarkably useful tool to understand the connection between the dynamo process in the solar interior and its observable manifestations at the surface. AfterExpand
Theoretical properties of Omega-loops in the convective zone of the Sun. 1: Emerging bipolar magnetic regions
It is proposed that the observed 500 G intensity of the magnetic fields emerging through the surface of the Sun can be understood from the Bernoulli effect in the upwelling Omega-loops of magneticExpand
THE INTERACTION OF NEW AND OLD MAGNETIC FLUXES AT THE BEGINNING OF SOLAR CYCLE 23
The 11 yr cycle of solar activity follows Hale's law by reversing the magnetic polarity of leading and following sunspots in bipolar regions during the minima of activity. In the 1996-1997 solarExpand
Comparisons between theory and observation of active region tilts
Active regions in the Sun are generally tilted relative to the azimuthal direction, with the leading side being closer to the equator than the following side. This tilts is known to increase withExpand
Dynamics of line-of-sight velocities and magnetic field in the solar photosphere during the formation of the large active region NOAA 10488
Analysis of SOHO longitudinal magnetograms and Dopplergrams has revealed the appearance of a region of enhanced upflow of matter in the photosphere when the top of a loop-shaped magnetic flux tubeExpand
Investigation of Mass Flows beneath a Sunspot by Time-Distance Helioseismology
A time-distance helioseismic technique is employed to analyze a set of high-resolution Dopplergram observations of a large sunspot by SOHO/MDI on 1998 June 18. A regularized, damped least-squaresExpand
The Solar Oscillations Investigation - Michelson Doppler Imager
The Solar Oscillations Investigation (SOI) uses the Michelson Doppler Imager (MDI) instrument to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations.Expand
...
1
2
3
4
5
...