Thyr: A volumetric ray-marching tool for simulating microwave emission

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dc.contributor.authorOsborne C.M.J.
dc.contributor.authorSimoes P.J.A.
dc.date.accessioned2024-03-12T23:53:48Z
dc.date.available2024-03-12T23:53:48Z
dc.date.issued2019
dc.description.abstract© 2019 The Author(s)Gyrosynchrotron radiation is produced by solar flares, and can be used to infer properties of the accelerated electrons and magnetic field of the flaring region. This microwave emission is highly dependent on many local plasma parameters, and the viewing angle. To correctly interpret observations, detailed simulations of the emission are required. Additionally, gyrosynchrotron emission from the chromosphere has been largely ignored in modelling efforts, and recent studies have shown the importance of thermal emission at millimetric wavelengths. Thyr is a new tool for modelling microwave emission from three-dimensional flaring loops with spatially varying atmosphere and increased resolution in the lower corona and chromosphere. Thyr is modular and open-source, consisting of separate components to compute the thermal and non-thermal microwave emission coefficients and perform three-dimensional radiative transfer (in local thermodynamic equilibrium). The radiative transfer integral is computed by a novel ray-marching technique to efficiently compute the contribution of many volume elements. This technique can also be employed on a variety of astrophysics problems. Herein we present a review of the theory of gyrosynchrotron radiation, and two simulations of identical flare loops in low- and high resolution performed with Thyr, with a spectral imaging analysis of differing regions. The high-resolution simulation presents a spectral hardening at higher frequencies. This hardening originates around the top of the chromosphere due to the strong convergence of the magnetic field, and is not present in previous models due to insufficient resolution. This hardening could be observed with a coordinated flare observation from active radio observatories.
dc.description.firstpage3386
dc.description.issuenumber3
dc.description.lastpage3397
dc.description.volume485
dc.identifier.doi10.1093/mnras/stz660
dc.identifier.issn1365-2966
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35303
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsAcesso Restrito
dc.subject.otherlanguageMethods: numerical
dc.subject.otherlanguageRadiative transfer
dc.subject.otherlanguageSun: flares
dc.subject.otherlanguageSun: radio radiation
dc.titleThyr: A volumetric ray-marching tool for simulating microwave emission
dc.typeArtigo
local.scopus.citations2
local.scopus.eid2-s2.0-85067065969
local.scopus.subjectAccelerated electrons
local.scopus.subjectMagnetic-field
local.scopus.subjectMethod: numerical
local.scopus.subjectMicrowave emissions
local.scopus.subjectProperty
local.scopus.subjectRay-marching
local.scopus.subjectSolar flare
local.scopus.subjectSun: radio radiation
local.scopus.subjectSun:flares
local.scopus.subjectVolumetrics
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85067065969&origin=inward
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