3D Magnetic Structures of Ellerman Bombs Revealed by S UNRISE III /SCIP

Résumé fourni par la source

Abstract Ellerman bombs (EBs) are widely recognized as photospheric and chromospheric signatures of magnetic reconnection. However, the 3D magnetic topology has remained elusive due to the lack of seamless height coverage in observations. Here, we present initial results from the S unrise iii /Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) observations of an emerging flux region. Exploiting the seeing-free, high-spatial-resolution observations provided by the 1 m balloon-borne telescope, SCIP achieved seamless multiline spectropolarimetry from the photosphere to the lower chromosphere. We analyzed the multiline Stokes profiles of the photospheric Fe i and K i lines and the chromospheric Ca ii lines, and applied the weak field approximation to the K i and Ca ii lines to reconstruct the 3D magnetic field structure. The blue- and red-wing brightenings of the Ca ii 8542 Å line appear at spatially offset locations, indicating bidirectional reconnection flows. The reconstructed 3D magnetic field reveals that the opposite-polarity field structure reaches different heights in the two events analyzed. In one event, it is confined to the lower layers and is absent at the formation height of the Ca ii 8542 Å core, which shows no intensity enhancement, whereas in the other event it extends up to the Ca ii 8542 Å core formation height, where enhanced line-core intensity is also observed. We interpret this as the reconnection current sheet reaching different altitudes. These results demonstrate that SCIP has successfully resolved the 3D structure of EBs, distinguishing magnetic reconnection events occurring at different atmospheric heights.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.