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Calibration of the Instrumental Crosstalk for the Near-IR Imaging Spectropolarimeter at the NST  

Kwangsu Ahn   Submitted: 2019-09-27 15:58

The Near-IR Imaging Spectropolarimeter (NIRIS) is a polarimeter that is installed at the New Solar Telescope at Big Bear Solar Observatory. This instrument takes advantages of the highest spatial resolution and flux. The primary mirror is an off-axis type, so it was our interest to evaluate its contribution to the crosstalk among the Stokes parameters since we could not put our calibration optics before the mirror. We would like to present our efforts to compensate for the crosstalk among Stokes profiles caused by the relay optics from the telescope to the detector. The overall data processing pipeline is also introduced.

Authors: K. Ahn and W. Cao
Projects: BBSO/NST

Publication Status: Accepted to ASP Conference Series
Last Modified: 2019-09-30 00:27
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Patterns of Flows in an Intermediate Prominence Observed by Hinode  

Kwangsu Ahn   Submitted: 2010-09-16 12:35

The investigation of plasma flows in filaments/prominences gives us clues to understanding their magnetic structures. We studied the patterns of flows in an intermediate prominence observed by Hinode/SOT. By examining a time series of Hα images and Ca II H images, we have found horizontal flows in the spine and vertical flows in the barb. Both of these flows have a characteristic speed of 10-20 km s?1. The horizontal flows displayed counterstreaming. Our detailed investigation revealed that most of the moving fragments in fact reversed direction at the end point of the spine near a footpoint close to the associated active region. These returning flows may be one possible explanation of the well-known counterstreaming flows in prominences. In contrast, we have found vertical flows?downward and upward?in the barb. Most of the horizontal flows in the spine seem to switch into vertical flows when they approach the barb, and vice versa. We propose that the net force resulting from a small deviation from magnetohydrostatic equilibrium, where magnetic fields are predominantly horizontal, may drive these patterns of flow. In the prominence studied here, the supposed magnetohydrostatic configuration is characterized by magnetic field lines sagging with angles of 13? and 39? in the spine and the barb, respectively.

Authors: Ahn, Kwangsu; Chae, Jongchul; Cao, Wenda; Goode, Philip R.
Projects: Hinode/SOT

Publication Status: Published in the ApJ
Last Modified: 2010-09-20 07:38
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Calibration of the Instrumental Crosstalk for the Near-IR Imaging Spectropolarimeter at the NST
Patterns of Flows in an Intermediate Prominence Observed by Hinode

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