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Solar spectropolarimetry of Ca II 8542 Å line: polarimeter development, calibration, and preliminary observations

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dc.contributor.author Hemanth, P
dc.contributor.author Nagaraju, K
dc.contributor.author Ravindra, B
dc.contributor.author Ramesh, K. B
dc.date.accessioned 2020-11-19T13:57:52Z
dc.date.available 2020-11-19T13:57:52Z
dc.date.issued 2018-11
dc.identifier.citation Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, No. 4, pp. 048002-1- 048002-14 en_US
dc.identifier.issn 2329-4221
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7281
dc.description Restricted Access © SPIE--The International Society for Optical Engineering https://doi.org/10.1117/1.JATIS.4.4.048002 en_US
dc.description.abstract Chromospheric magnetic fields are of paramount importance in understanding the dynamics of energetic events in the solar atmosphere. At the Kodaikanal Solar Observatory, several polarimeters were developed in the past to study the active region magnetic fields. A polarimeter has been developed and installed at Kodaikanal Tower-Tunnel Telescope to study the active regions at the chromospheric level, in Ca ii 8542 Å spectral line. Design aspects of the instrument and polarimetry strategy are discussed. Telescope instrumental polarization has been revisited, and possible ways to reduce it have been proposed. The telescope polarization model developed in Zemax to examine the analytical instrumental polarization model is discussed. The polarimeter control unit, and the software developed to operate the polarimeter are briefly described. Polarimetric calibration of the instrument, observations, corrections for instrumental polarization, and the sample Stokes profiles are presented. Polarimetric accuracy and sensitivity are estimated to be better than 3  ×  10  −  2 and 3  ×  10  −  3, respectively. en_US
dc.language.iso en en_US
dc.publisher SPIE-The International Society for Optical Engineering en_US
dc.subject Polarimeter en_US
dc.subject Sun; chromosphere en_US
dc.subject Ca II en_US
dc.subject 8542 en_US
dc.title Solar spectropolarimetry of Ca II 8542 Å line: polarimeter development, calibration, and preliminary observations en_US
dc.type Article en_US


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