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Inference of heating properties from "hot" non-flaring plasmas in active region cores i. single nanoflares

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Title: Inference of heating properties from "hot" non-flaring plasmas in active region cores i. single nanoflares
Authors: Barnes, WT
Cargill, PJ
Bradshaw, SJ
Item Type: Journal Article
Abstract: The properties expected of “hot” non-flaring plasmas due to nanoflare heating in active regions are investigated using hydrodynamic modeling tools, including a two-fluid development of the EBTEL code. Here we study a single nanoflare and show that while simple models predict an emission measure distribution extending well above 10 MK that is consistent with cooling by thermal conduction, many other effects are likely to limit the existence and detectability of such plasmas. These include: differential heating between electrons and ions, ionization non-equilibrium and, for short nanoflares, the time taken for the coronal density to increase. The most useful temperature range to look for this plasma, often called the “smoking gun” of nanoflare heating, lies between 106.6 and 107 K. Signatures of the actual heating may be detectable in some instances.
Issue Date: 20-Sep-2016
Date of Acceptance: 12-Jul-2016
URI: http://hdl.handle.net/10044/1/37480
DOI: https://dx.doi.org/10.3847/0004-637X/829/1/31
ISSN: 1538-4357
Publisher: American Astronomical Society
Start Page: 31
End Page: 31
Journal / Book Title: Astrophysical Journal
Volume: 829
Issue: 1
Copyright Statement: © 2016. The American Astronomical Society. All rights reserved
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
hydrodynamics
plasmas
Sun: corona
EMISSION MEASURE DISTRIBUTIONS
SOLAR CORONAL LOOPS
X-RAY OBSERVATIONS
TIME-DEPENDENCE
HINODE
TRANSPORT
TELESCOPE
DENSITY
SPHINX
XRT
Astronomical And Space Sciences
Organic Chemistry
Physical Chemistry (Incl. Structural)
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences