NDLI: Synthetic Radio Views of Simulated Solar Flux Ropes

Content Provider	Springer Nature Link
Author	Kuznetsov, A. A. Keppens, R. Xia, C.
Copyright Year	2016
Abstract	We produce synthetic radio views of simulated flux ropes in the solar corona, where finite- $β$ magnetohydrodynamic (MHD) simulations serve to mimic the flux-rope formation stages, as well as their stable endstates. These endstates represent twisted flux ropes where balancing Lorentz forces, gravity, and pressure gradients determine the full thermodynamic variation throughout the flux rope. The models obtained are needed to quantify radiative transfer in radio bands, and they allow us to contrast weak with strong magnetic-field conditions. Field strengths of up to 100 G in the flux rope yield radio views dominated by optically thin free–free emission. The forming flux rope shows clear morphological changes in its emission structure as it deforms from an arcade to a flux rope, both on disk and at the limb. For an active-region filament channel with a field strength of up to 680 G in the flux rope, gyroresonance emission (from the third and fourth gyrolayers) can be detected, and it even dominates free–free emission at frequencies of up to 7 GHz. Finally, we also show synthetic views of a simulated filament embedded within a (weak-field) flux rope, resulting from an energetically consistent MHD simulation. For this filament, synthetic views at the limb show clear similarities with actual observations, and the transition from optically thick (below 10 GHz) to optically thin emission can be reproduced. On the disk, its dimension and temperature conditions are as yet not realistic enough to yield the observed radio-brightness depressions.
Starting Page	823
Ending Page	845
Page Count	23
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	291
Issue Number	3
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-02-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radio emission, prominences Radio emission, active regions Prominences, formation and evolution Prominences, models Magnetohydrodynamics Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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