Abstract Details

Name: K. Nagaraju
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2017_1402
Title : Spectropolarimetric observations of a small scale reconnection event in the chromosphere simultaneously in H alpha and Ca II at 854.2 nm
Authors and Co-Authors : K. Amareswari and K. Sankarasubramanian, Space Astronomy Group ISITE,ISAC, K. E. Rangarajan, Indian Institute of Astrophysics
Abstract Type : Oral
Abstract Category : Sun and the Solar System
Abstract : Magnetic reconnection plays a central role in producing energetic events such as Ellerman bombs, small scale jets, flares and CMEs in the solar atmosphere. However direct observation of magnetic field evolution associated with these events is very challenging. It is even more challenging to simultaneously observe magnetic field simultaneously at different heights such as photosphere, chromosphere and corona. We report in this presentation about full Stokes spectropolarimetric observations simultaneously in H alpha and Ca II at 854.2 nm lines of a magnetic reconnection event in the chromosphere. The observations have been obtained using the SPINOR instrument at the Dunn Solar Telescope, NSO, NM. The magnetic field information in the chromosphere is derived using Ca II 8542 line and at the photosphere it is derived using Fe I line at 656.9 nm adjacent to H alpha. Modeling of the atmosphere before and during the reconnection event through inversion of the data will be presented. We would also present briefly about the plans for simultaneous spectropolarimetry in multiple lines at Kodaikanal tower tunnel telescope towards the goal of measuring magnetic field simultaneously in the photosphere and chromosphere.