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25 April 2024

» arxiv » 1605.9738

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The First Focused Hard X-ray Images of the Sun with NuSTAR
Brian W. Grefenstette ; Lindsay Glesener ; Säm Krucker ; Hugh Hudson ; Iain G. Hannah ; David M. Smith ; Julia K. Vogel ; Stephen M. White ; Kristin K. Madsen ; Andrew J. Marsh ; Amir Caspi ; Bin Chen ; Albert Shih ; Matej Kuhar ; Steven E. Boggs ; Finn E. Christensen ; William W. Craig ; Karl Forster ; Charles J. Hailey ; Fiona A. Harrison ; Hiromasa Miyasaka ; Daniel Stern ; William W. Zhang ;
Date:	31 May 2016
Abstract:	We present results from the the first campaign of dedicated solar observations undertaken by the extit{Nuclear Spectroscopic Telescope ARray} ({em NuSTAR}) hard X-ray telescope. Designed as an astrophysics mission, {em NuSTAR} nonetheless has the capability of directly imaging the Sun at hard X-ray energies ($>$3~keV) with an increase in sensitivity of at least two magnitude compared to current non-focusing telescopes. In this paper we describe the scientific areas where extit{NuSTAR} will make major improvements on existing solar measurements. We report on the techniques used to observe the Sun with extit{NuSTAR}, their limitations and complications, and the procedures developed to optimize solar data quality derived from our experience with the initial solar observations. These first observations are briefly described, including the measurement of the Fe K-shell lines in a decaying X-class flare, hard X-ray emission from high in the solar corona, and full-disk hard X-ray images of the Sun.
Source:	arXiv, 1605.9738
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