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Sanjay Gosain
National Solar Observatory
Position
Observatory Scientist
Department
Solar Physics
Field of research
Natural Sciences (Astrophysics and Astrononmy)
Email
sgosaiw@gmail.com
My OpenAccess portfolio

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Full Stokes Polarimeter for Chromospheric Measurements with SOLIS/VSM
Natural Sciences (Astrophysics and Astrononmy)
1628 views
Date of upload:
09.09.2015
Co-author:
Jack Harvey
Abstract:
SOLIS stands for Synoptic Optical Long-term Investigations of the Sun. Daily fulldisk magnetic fields measurements of the Sun are being done for several decades at NSO Kittpeak. The SOLIS/VSM instrument replaced earlier instruments at Kitt Peak. The current SOLIS/VSM instrument has capability to make full Stokes polarimetry in photospheric lines, however, for chromosphere only longitudinal polarimetry exists. With the recent progress in non-LTE inversions of the chromospheric spectra it was decided that a full Stokes polarimeter needs to be developed. Based on similar design to photospheric modulator we have developed a separate modulator for chromospheric full Stokes measurements using Ca II 854.2 nm line. We will present design and performance of the new modulator and possibly sample observations.
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SPRING: A Proposal for Next Generation Synoptic Solar Instrumentation
Natural Sciences (Astrophysics and Astrononmy)
1486 views
Date of upload:
09.09.2015
Co-author:
Markus Roth, Frank Hill, Michael Thompson
Abstract:
Synoptic observations of the Sun are very important to understand the long term behavior of the solar activity cycle. Our current understanding solar magnetic cycle is rather in its infancy, as can be inferred from our very poor prediction for the strength of solar cycle 24, based on various dynamo models. Solar magnetism is at the heart of all solar activity and therefore it is important to understand what parameters govern the magnetic cycle in the Sun. An important parameter that is realized more recently is the internal dynamics, i.e., profile of solar internal rotation and nature of large scale meridional flows. Therefore, it is important to study the solar interior by making use of helioseismology. Ground based helioseismology networks such as GONG are now quite few decades old and its possible failure poses risk to the continuity of solar oscillation data. Hence, a next generation of synoptic network SPRING is being proposed and is currently under design study. We will present science requirements and the details of the SPRING network.
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Fabry-Perot Approach to SPRING
Natural Sciences (Physics)
1029 views
Date of upload:
18.05.2016
Co-author:
Abstract:
Discussion about possiblity of using FP Etalon for SPRING project
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WP80: Synoptic Observations: Solar Physics Research Integrated Network Group - SPRING
Natural Sciences (Astrophysics and Astrononmy)
1092 views
Date of upload:
25.01.2017
Co-author:
Joe Staiger, Markus Roth
Abstract:
Presentation given at Solarnet 4 at Lanzarote, Spain during Jan 2017

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