Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High Precision Full Stokes Spectropolarimetry of the Sun as a
  star-Instrument design aspects   The magnetic field plays a major role in governing the dynamics of the sun.
Many interesting features like sunspots, flares, prominences, and Coronal Mass
Ejections (CMEs) occur on its surface due to the dynamics associated with the
magnetic fields. The magnetic activity exhibits spatial scales ranging from
very fine scale (below the resolution limit of the current largest telescope)
to large scale such as sunspots, active regions and the spatial scales as large
as the sun itself. While the major efforts in building large telescopes is
going on towards the goal of resolving smallest structure possible we propose
here to measure the magnetic field on the global scale. For this purpose we
propose an instrument to carryout high precision and high accurate
spectropolarimetry of sun-as-a-star. In this thesis, we explore various
instrumental design aspects that are necessary to make such observations. As
part of the design consideration we have analysed a major noise source i.e.
seeing induced cross-talk through simulation as well as using the measured
scintillation data. Further, we have analysed full disk Stokes images from
SOLIS/VSM and SDO/HMI for the purpose of getting a rough idea on the disk
averaged Stokes signal level. The instrument design aspects are mainly
constrained by the need to modulate the light before it enters the telescope
and image the full sun as a point source. Modulating the light before it enters
the telescope has the advantage of completely avoiding the instrumental
polarization which will enable us to carry out high accurate polarimetric
measurements. We have explored in this thesis various concepts of polarization
modulator and spectral discriminator and worked out their suitability for the
purpose of carrying out high precision and high accurate spectropolarimetry of
sun-as-a-star at high spectral resolution.

21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an