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

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dc.contributor.authorChakraborty, S.
dc.contributor.authorQian, L.
dc.contributor.authorBaker, J. B. H.
dc.contributor.authorRuohoniemi, J. M.
dc.contributor.authorKuyeng, Karim
dc.contributor.authorMclnerney, J. M.
dc.date.accessioned2022-09-20T11:34:51Z
dc.date.available2022-09-20T11:34:51Z
dc.date.issued2022-06
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.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationChakraborty, S., Qian, L., Baker, J. B. H., Ruohoniemi, J. M., Kuyeng, K., & Mclnerney, J. M. (2022). Driving Influences of the Doppler Flash Observed by SuperDARN HF Radars in Response to Solar Flares.==$Journal of Geophysical Research: Space Physics, 127$==(6), e2022JA030342. https://doi.org/10.1029/2022JA030342es_ES
dc.identifier.doihttps://doi.org/10.1029/2022JA030342es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Geophysical Research: Space Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/5284
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:2169-9402
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/es_ES
dc.subjectSpace weatheres_ES
dc.subjectShortwave fadeoutes_ES
dc.subjectDoppler flashes_ES
dc.subjectSolar flarees_ES
dc.subjectMagnetic crochetes_ES
dc.subjectSuperDARNes_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleDriving Influences of the Doppler Flash Observed by SuperDARN HF Radars in Response to Solar Flareses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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