Driving Influences of the Doppler Flash Observed by SuperDARN HF Radars in Response to Solar Flares

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dc.contributor.authorChakraborty, S.en
dc.contributor.authorQian, L.en
dc.contributor.authorBaker, J. B. H.en
dc.contributor.authorRuohoniemi, J. M.en
dc.contributor.authorKuyeng, K.en
dc.contributor.authorMclnerney, J. M.en
dc.date.accessioned2023-02-17T15:54:31Zen
dc.date.available2023-02-17T15:54:31Zen
dc.date.issued2022-06-01en
dc.date.updated2023-02-16T21:53:42Zen
dc.description.abstractSudden enhancement in high-frequency absorption is a well-known impact of solar flare-driven Short-Wave Fadeout (SWF). Less understood, is a perturbation of the radio wave frequency as it traverses the ionosphere in the early stages of SWF, also known as the Doppler flash. Investigations have suggested two possible sources that might contribute to it’s manifestation: first, enhancements of plasma density in the D-and lower E-regions; second, the lowering of the F-region reflection point. Our recent work investigated a solar flare event using first principles modeling and Super Dual Auroral Radar Network (SuperDARN) HF radar observations and found that change in the F-region refractive index is the primary driver of the Doppler flash. This study analyzes multiple solar flare events observed across different SuperDARN HF radars to determine how flare characteristics, properties of the traveling radio wave, and geophysical conditions impact the Doppler flash. In addition, we use incoherent scatter radar data and first-principles modeling to investigate physical mechanisms that drive the lowering of the F-region reflection points. We found, (a) on average, the change in E- and F-region refractive index is the primary driver of the Doppler flash, (b) solar zenith angle, ray’s elevation angle, operating frequency, and location of the solar flare on the solar disk can alter the ionospheric regions of maximum contribution to the Doppler flash, (c) increased ionospheric Hall and Pedersen conductance causes a reduction of the daytime eastward electric field, and consequently reduces the vertical ion-drift in the lower and middle latitude ionosphere, which results in lowering of the F-region ray reflection point.en
dc.description.versionPublished versionen
dc.format.extent16 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN e2022JA030342 (Article number)en
dc.identifier.doihttps://doi.org/10.1029/2022JA030342en
dc.identifier.eissn2169-9402en
dc.identifier.issn2169-9380en
dc.identifier.issue6en
dc.identifier.orcidRuohoniemi, John [0000-0002-2747-7066]en
dc.identifier.otherPMC9286435en
dc.identifier.otherJGRA57228 (PII)en
dc.identifier.pmid35864909en
dc.identifier.urihttp://hdl.handle.net/10919/113854en
dc.identifier.volume127en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000808063900001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectspace weatheren
dc.subjectshortwave fadeouten
dc.subjectDoppler flashen
dc.subjectsolar flareen
dc.subjectmagnetic crocheten
dc.subjectSuperDARNen
dc.subjectIONOSPHERIC DISTURBANCESen
dc.subjectFIELDen
dc.titleDriving Influences of the Doppler Flash Observed by SuperDARN HF Radars in Response to Solar Flaresen
dc.title.serialJournal of Geophysical Research: Space Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
dcterms.dateAccepted2022-05-24en
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Electrical and Computer Engineeringen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

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