Magnetic diffusion in Solar atmosphere produces measurable electric fields

Abstract

The efficient release of magnetic energy in astrophysical plasmas, such as during solar flares, can in principle be achieved through magnetic diffusion, at a rate determined by the associated electric field. However, attempts at measuring electric fields in the solar atmosphere are scarce, and none exist for sites where the magnetic energy is presumably released. Here, we present observations of an energetic event using the National Science Foundation's Daniel K. Inouye Solar Telescope, where we detect the polarization signature of electric fields associated with magnetic diffusion. We measure the linear and circular polarization across the hydrogen H-epsilon Balmer line at 397 nm at the site of a brightening event in the solar chromosphere. Our spectro-polarimetric modeling demonstrates that the observed polarization signals can only be explained by the presence of electric fields, providing conclusive evidence of magnetic diffusion, and opening a new window for the quantitative study of this mechanism in space plasmas.

24 pages, 11 figures, published in Nature Communications

References in corpus (8)

• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
• Magnetic reconnection in the era of exascale computing and multiscale experiments
• Fluid description of multi-component solar partially ionized plasma
• The Visible Spectro-Polarimeter of the Daniel K. Inouye Solar Telescope
• DeSIRe: Departure coefficient aided Stokes Inversion based on Response functions
• Automating Ellerman bomb detection in ultraviolet continua
• The Effects of Atmospheric Dispersion on High-Resolution Solar Spectroscopy
• Formation of H$\epsilon$ in the solar atmosphere

Cited by in corpus (1)

• Small-scale energetic phenomena in Hε: Ellerman bombs, UV bursts, and small flares