Results 11 to 20 of about 6,168 (304)
Magnetic Fields in the Solar Convection Zone
Living Reviews in Solar Physics, 2009 Active regions on the solar surface are generally thought to originate from a strong toroidal magnetic field generated by a deep seated solar dynamo mechanism operating at the base of the solar convection zone.
Yuhong Fan
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Determination of the Topology Skeleton of Magnetic Fields in a Solar Active Region [PDF]
Chinese Journal of Astronomy and Astrophysics, 2008 13 pages, 7 figures, 1 ...
Zhao, Hui +4 more
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Record-breaking Coronal Magnetic Field in Solar Active Region 12673 [PDF]
The Astrophysical Journal Letters, 2019 Abstract The strongest magnetic fields on the Sun are routinely detected at dark sunspots. The magnitude of the field is typically about 3000 G, with only a few exceptions that reported the magnetic field in excess of 5000 G. Given that the magnetic field decreases with height in the solar atmosphere, no coronal magnetic field above ...
Sergey A. Anfinogentov +3 more
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Magnetic Fields in the Solar Convection Zone
Living Reviews in Solar Physics, 2004 Recent studies of the dynamic evolution of magnetic flux tubes in the solar convection zone are reviewed with focus on emerging flux tubes responsible for the formation of solar active regions. The current prevailing picture is that active regions on the
Fan Yuhong
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Coronal Currents, Magnetic Fields, and Heating in a Solar Active Region
The Astrophysical Journal, 1998 We compare microwave images of a solar active region with state-of-the-art fully nonlinear force-free extrapolations of the photospheric fields in order to study the link between coronal currents and heating of the corona. This extrapolation fully takes into account the nonuniform distribution of electric currents observed in the photosphere and its ...
Jeongwoo Lee +4 more
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The evolution of a spot–spot-type solar active region which produced a major solar eruption
Frontiers in Astronomy and Space Sciences, 2023 Solar active regions are the main sources of large solar flares and coronal mass ejections. It is found that the active regions producing large eruptions usually show compact, highly sheared polarity inversion lines.
Lijuan Liu, Lijuan Liu, Lijuan Liu
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Large Photospheric Doppler Shift in Solar Active Region 12673. I. Field-aligned Flows
The Astrophysical Journal, 2023 Delta ( δ ) sunspots sometimes host fast photospheric flows along the central magnetic polarity inversion line (PIL). Here we study the strong Doppler shift signature in the central penumbral light bridge of solar active region NOAA 12673.
Jiayi Liu +5 more
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Magnetic field variations and seismicity of solar active regions [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2009 Abstract Dynamical changes in the solar corona have proven to be very important in inducing seismic waves into the photosphere. Different mechanisms for their generation have been proposed. In this work, we explore the magnetic field forces as plausible mechanisms to generate sunquakes as proposed by Hudson, Fisher & Welsch.
Martinez-Oliveros, J. C., Donea, A. -C.
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On the Origin of the Photospheric Magnetic Field
The Astrophysical Journal, 2022 This article presents results that challenge the paradigms that (1) the convection zone is the source of the radial magnetic field in the photosphere and (2) that coronal currents are neutralized from the perspective of the photosphere.
Peter W. Schuck +3 more
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Magnetic Field Reconstruction in a Solar Active Region [PDF]
Symposium - International Astronomical Union, 2001 Supposing coronal magnetic fields are in a force-free state from the chromosphere to the height of two solar radii, we reconstruct 3D force-free magnetic fields by making use of a new numerical technique, in which the fields are represented by a boundary integral equation based on a specific Green's function.
H. Wang, Y. Yan, T. Sakurai
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