A first spectroscopic measurement of the magnetic field strength for an active region of the solar corona

Abstract

For all involved in astronomy, the importance of monitoring and determining astrophysical magnetic field strengths is clear. It is also a well-known fact that the corona magnetic fields play an important part in the origin of solar flares and the variations of space weather. However, after many years of solar corona studies, there is still no direct and continuous way to measure and monitor the solar magnetic field strength. We will here present a scheme which allows such a measurement, based on a careful study of an exotic class of atomic transitions known as magnetic induced transitions in Fe${}^{9+}$. In this contribution we present a first application of this methodology and determine a value of the coronal field strength using the spectroscopic data from HINODE.

References in corpus (4)

• Understanding space weather to shield society: A global road map for 2015-2025 commissioned by COSPAR and ILWS
• The solar magnetic field
• Large-scale multiconfiguration Dirac-Hartree-Fock calculations for astrophysics: Cl-like ions from Cr~VIII to Zn~XIV
• Magnetic-field-dependent angular distributions and linear polarizations of emissions from the $2p^{5}3s{}^3{P}_2$ state in Ne-like ions

Cited by in corpus (14)

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• Measurements of Coronal Magnetic Field Strengths in Solar Active Region Loops
• Hinode/EIS coronal magnetic field measurements at the onset of a C2 flare
• Solar Coronal Magnetic Fields and Sensitivity Requirements for Spectropolarimetry Channel of VELC Onboard Aditya-L1
• Application of a magnetic-field-induced transition in Fe X to solar and stellar coronal magnetic field measurements
• Measurements of the magnetic field strengths at the bases of stellar coronae using the magnetic-field-induced transition theory
• A novel inversion method to determine the coronal magnetic field including the impact of bound-free absorption
• Optimal spectral lines for measuring chromospheric magnetic fields
• Solar coronal magnetic field measurements using spectral lines available in Hinode/EIS observations: Strong and weak field techniques and temperature diagnostics
• Forward Modeling of Magnetic-field Measurements at the Bases of Stellar Coronae through Extreme-Ultraviolet Spectroscopy
• Understanding the magnetic field and plasma-$\beta$ along umbral fan loops traced using 3-min slow waves
• Forward Modeling of Solar Coronal Magnetic Field Measurements Based on a Magnetic-field-induced Transition in Fe X