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- W1973723772 abstract "Using photospheric vector magnetograms from the Haleakala Stokes Polarimeter and coronal X-ray images from the Yohkoh Soft X-Ray Telescope (SXT), we infer values of the force-free field parameter α at both photospheric and coronal levels within 140 active regions. We determine the value of α for a linear force-free field that best fits each magnetogram in a least-squares sense. We average values from all available magnetograms to obtain a single mean photospheric α-value ⟨αp⟩ for each active region. From the SXT images we estimate α in the corona by determining (π/L) sin γ for individual loops, where γ is the observed shear angle of X-ray loops of length L. We then average these values of α to obtain a single coronal α value, ⟨αc⟩, for each active region." @default.
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- W1973723772 date "1997-06-01" @default.
- W1973723772 modified "2023-10-13" @default.
- W1973723772 title "On the Subphotospheric Origin of Coronal Electric Currents" @default.
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- W1973723772 doi "https://doi.org/10.1086/304065" @default.
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