![]() Only the light bridge, where relatively weak and highly inclined magnetic fields emerge over a duration of 13 h, shows a spatial coincidence of thermal enhancements and electric currents. These currents produce a chromospheric temperature excess of about 600−800 K relative to the umbra. We find that the light bridge is a site of strong electric currents, of about 0.3 A m −2 at the bottom boundary, which extend to about 0.7 Mm while decreasing monotonically with height. The photospheric magnetic field from HMI was extrapolated to the corona using a non-force-free field technique that provided the three-dimensional distribution of electric currents, while an inversion of the chromospheric Ca II line with a local thermodynamic equilibrium and a nonlocal thermodynamic equilibrium spectral archive delivered the temperature stratifications from the photosphere to the chromosphere. We combine high-resolution spectroscopic Ca II data from the Dunn Solar Telescope and vector magnetic field observations from the Helioseismic and Magnetic Imager (HMI) to investigate thermal enhancements in a sunspot light bridge. We aim to determine how Ohmic dissipation by electric currents can heat the solar chromosphere. Resistive Ohmic dissipation has been suggested as a mechanism for heating the solar chromosphere, but few studies have established this association.Īims. ![]() National Solar Observatory (NSO), 3665 Discovery Drive, Boulder, CO 80303, USAĭepartment of Physics and Astronomy, California State University, Northridge (CSUN), Northridge, CA 91330-8268, USAĬontext. Udaipur Solar Observatory, Physical Research Laboratory, Dewali Badi Road, Udaipur, 313001 Rajasthan, IndiaĮ-mail: for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville, Huntsville, AL 35899, USA Louis 1, Avijeet Prasad 2, Christian Beck 3, Debi P. Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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