Evidence of nonthermal particles in coronal loops heated impulsively by nanoflares-Reference-Cited by-同舟云学术

Evidence of nonthermal particles in coronal loops heated impulsively by nanoflares

Published:2014-10-17 Issue:6207 Volume:346 Page:
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Testa P.¹,De Pontieu B.²³,Allred J.⁴,Carlsson M.³,Reale F.⁵,Daw A.⁴,Hansteen V.³,Martinez-Sykora J.⁶,Liu W.²⁷,DeLuca E. E.¹,Golub L.¹,McKillop S.¹,Reeves K.¹,Saar S.¹,Tian H.¹,Lemen J.²,Title A.²,Boerner P.²,Hurlburt N.²,Tarbell T. D.²,Wuelser J. P.²,Kleint L.²⁶,Kankelborg C.⁸,Jaeggli S.⁸

Affiliation:

1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.

2. Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Org. A021S, Building 252, Palo Alto, CA 94304, USA.

3. Institute of Theoretical Astrophysics, University of Oslo, Post Office Box 1029, Blindern, N-0315, Oslo, Norway.

4. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.

5. Dipartimento di Fisica e Chimica, Universita’ di Palermo and Istituto Nazionale di Astrofisica (INAF)/Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy.

6. Bay Area Environmental Research Institute 596 1st Street West, Sonoma, CA 95476, USA.

7. W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA.

8. Department of Physics, Montana State University, Bozeman, Post Office Box 173840, Bozeman, MT 59717, USA.

Abstract

The physical processes causing energy exchange between the Sun’s hot corona and its cool lower atmosphere remain poorly understood. The chromosphere and transition region (TR) form an interface region between the surface and the corona that is highly sensitive to the coronal heating mechanism. High-resolution observations with the Interface Region Imaging Spectrograph (IRIS) reveal rapid variability (~20 to 60 seconds) of intensity and velocity on small spatial scales (≲500 kilometers) at the footpoints of hot and dynamic coronal loops. The observations are consistent with numerical simulations of heating by beams of nonthermal electrons, which are generated in small impulsive (≲30 seconds) heating events called “coronal nanoflares.” The accelerated electrons deposit a sizable fraction of their energy (≲10 25 erg) in the chromosphere and TR. Our analysis provides tight constraints on the properties of such electron beams and new diagnostics for their presence in the nonflaring corona.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference75 articles.

1. On Solving the Coronal Heating Problem

2. Coronal Loops: Observations and Modeling of Confined Plasma

3. HEATING OF THE SOLAR CHROMOSPHERE AND CORONA BY ALFVÉN WAVE TURBULENCE

4. Nanoflares and the solar X-ray corona

5. A Flux‐Tube Tectonics Model for Solar Coronal Heating Driven by the Magnetic Carpet

Cited by 156 articles. 订阅此论文施引文献订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献

1. The Solar EruptioN Integral Field Spectrograph;Solar Physics;2024-08

2. Modeling Transition Region Hot Loops on the Sun: The Necessity of Rapid, Complex Spatiotemporal Heating and Nonequilibrium Ionization;The Astrophysical Journal;2024-08-01

3. Determining the Nanoflare Heating Frequency of an X-Ray Bright Point Observed by MaGIXS;The Astrophysical Journal;2024-05-01

4. Accelerated particle beams in a 3D simulation of the quiet Sun;Astronomy & Astrophysics;2024-03

5. Transverse MHD Waves as Signatures of Braiding-induced Magnetic Reconnection in Coronal Loops;The Astrophysical Journal Letters;2024-01-01