Reconstruction of Solar Coronal Linear Force-Free Magnetic Field

reconstruction of solar coronal linear force-free magnetic field

A regularization method for the extrapolation of the photospheric solar magnetic field I. Linear force-free field

We present a method for reconstructing the magnetic field B above the photosphere {z = 0} as the solution of the boundary value problem (BVP) for a bounded regular forcefree magnetic field in Ω = {z > 0} from its boundary values supposed to be given on {z = 0}. We propose a way for regularizing the class of standard extrapolation methods which turns out to diverge quickly with height, because o...

Observations of Solar Coronal Magnetic

This review discusses methods for determining solar coro-nal magnetic elds, with an emphasis on radio measurements of eld strengths in solar active regions.

The Solar Coronal Magnetic Field Measurements With SOLARC

Direct solar coronal magnetic field measurements have become possible since recent development of high-sensitivity infrared detection technology. The SOLARC instrument installed on Mt. Haleakala is such a polarimetric coronagraph that was designed for routinely observing Stokes parameter profiles in near infrared (NIR) wavelengthes. The Fe 1075 nm forbidden coronal emission line (CEL) is potent...

Nonlinear force-free coronal magnetic field modeling scheme based on the direct boundary integral formulation

The boundary integral equation (BIE) method was first proposed by Yan and Sakurai [2000], which is used to extrapolate the nonlinear force-free magnetic field in the solar atmosphere. Recently, Yan and Li [2006] improved the BIE method and proposed the direct boundary integral equation (DBIE) formulation, which represents the nonlinear force-free magnetic field by direct integration of the magn...

Magnetic-Field Confinement in the Solar Corona. I. Force-Free Magnetic Fields

Axisymmetric force-free magnetic fields external to a unit sphere are studied as solutions to boundary value problems in an unbounded domain posed by the equilibrium equations. It is well known from virial considerations that stringent global constraints apply for a force-free field to be confined in equilibrium against expansion into the unbounded space. This property as a basic mechanism for ...