A solar flare driven by thermal conduction observed in mid-infrared

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dc.contributor.authorLopez F.M.
dc.contributor.authorGimenez De Castro C.G.
dc.contributor.authorMandrini C.H.
dc.contributor.authorSimoes P.J.A.
dc.contributor.authorCristiani G.D.
dc.contributor.authorGary D.E.
dc.contributor.authorFrancile C.
dc.contributor.authorDemoulin P.
dc.date.accessioned2024-03-12T19:17:49Z
dc.date.available2024-03-12T19:17:49Z
dc.date.issued2022
dc.description.abstract© ESO 2022.Context. The mid-infrared (mid-IR) range has been mostly unexplored for the investigation of solar flares. It is only recently that new mid-IR flare observations have begun opening a new window into the response and evolution of the solar chromosphere. These new observations have been mostly performed by the AR30T and BR30T telescopes that are operating in Argentina and Brazil, respectively. Aims. We present the analysis of SOL2019-05-15T19:24, a GOES class C2.0 solar flare observed at 30 THz (10 μm) by the ground-based telescope AR30T. Our aim is to characterize the evolution of the flaring atmosphere and the energy transport mechanism in the context of mid-IR emission. Methods. We performed a multi-wavelength analysis of the event by complementing the mid-IR data with diverse ground- and space-based data from the Solar Dynamics Observatory (SDO), the H-α Solar Telescope for Argentina, and the Expanded Owens Valley Solar Array (EOVSA). Our study includes the analysis of the magnetic field evolution of the flaring region and of the development of the flare. Results. The mid-IR images from AR30T show two bright and compact flare sources that are spatially associated with the flare kernels observed in ultraviolet (UV) by SDO. We confirm that the temporal association between mid-IR and UV fluxes previously reported for strong flares is also observed for this small flare. The EOVSA microwave data revealed flare spectra consistent with thermal free-free emission, which lead us to dismiss the existence of a significant number of non-thermal electrons. We thus consider thermal conduction as the primary mechanism responsible for energy transport. Our estimates for the thermal conduction energy and total radiated energy fall within the same order of magnitude, reinforcing our conclusions.
dc.description.volume657
dc.identifier.doi10.1051/0004-6361/202141967
dc.identifier.issn1432-0746
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34518
dc.relation.ispartofAstronomy and Astrophysics
dc.rightsAcesso Aberto
dc.subject.otherlanguageSun: activity
dc.subject.otherlanguageSun: chromosphere
dc.subject.otherlanguageSun: flares
dc.subject.otherlanguageSun: infrared
dc.titleA solar flare driven by thermal conduction observed in mid-infrared
dc.typeArtigo
local.scopus.citations9
local.scopus.eid2-s2.0-85122855849
local.scopus.subjectArgentina
local.scopus.subjectMidinfrared
local.scopus.subjectOwens valleys
local.scopus.subjectSolar dynamics observatories
local.scopus.subjectSolar flare
local.scopus.subjectSun: activity
local.scopus.subjectSun: Chromosphere
local.scopus.subjectSun: infrared
local.scopus.subjectSun:flares
local.scopus.subjectThermal conduction
local.scopus.updated2024-12-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85122855849&origin=inward
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