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Diagnosing chromospheric magnetic field through simultaneous spectropolarimetry in Hα and Ca II 854.2 nm

Published online by Cambridge University Press:  24 September 2020

K. Nagaraju Open the ORCID record for K. Nagaraju [Opens in a new window] ,
K. Sankarasubramanian  and
K. E. Rangarajan
K. Nagaraju
Affiliation:
Indian Institute of Astrophysics, Sarjapur Road, Bengaluru, India email: mailto:nagarajuk@iiap.res.in; rangaraj@iiap.res.in
K. Sankarasubramanian
Affiliation:
URSC & ISRO, Vimanapura, Bengaluru, India email: sankark@ursc.isro.gov.in
K. E. Rangarajan
Affiliation:
Indian Institute of Astrophysics, Sarjapur Road, Bengaluru, India email: mailto:nagarajuk@iiap.res.in; rangaraj@iiap.res.in
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Abstract

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Measurement of magnetic field in this layer is challenging both from point of view of observations and interpretation of the data. We present in this work about spectropolarimetric observations of a pore, simultaneously in Ca ii (CaIR) at 854.2 nm (CaIR) and H α (656.28 nm). The observed region includes a small scale energetic event (SSEE) taking place in the region between the pore and the region which show opposite polarity to that of pore at the photosphere. The energetic event appears to be a progressive reconnection event as shown by the time evolution of the intensity profiles. Closer examination of the intensity profiles from the downflow regions suggest that the height of formation of CaIR is higher than that of Hi α, contrary to the current understanding about their height of formation. Preliminary results on the inversion of Stokes-I and V profiles of CaIR are also presented.

Keywords

Photosphere: Magnetic fieldChromosphere: Magnetic fieldMulti-line-Spectropolarimetry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 46 - 52
Copyright
© International Astronomical Union 2020

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