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Millimeter and X-Ray Emission from the 5 July 2012 Solar Flare

Tsap Y.; Nagnibeda V.; Motorina G.; Smirnova V.; Ryzhov V.; Morgachev A.; Kuznetsov S.

dc.contributor.authorTsap Y.
dc.contributor.authorNagnibeda V.
dc.contributor.authorMotorina G.
dc.contributor.authorSmirnova V.
dc.contributor.authorRyzhov V.
dc.contributor.authorMorgachev A.
dc.contributor.authorKuznetsov S.
dc.date.accessioned2022-10-27T12:19:28Z
dc.date.available2022-10-27T12:19:28Z
dc.identifier.urihttps://www.utupub.fi/handle/10024/157832
dc.description.abstract<p>The 5 July 2012 solar flare SOL2012-07-05T11:44 (11:39 – 11:49 UT) with an increasing millimeter spectrum between 93 and 140 GHz is considered. We use space and ground-based observations in X-ray, extreme ultraviolet, microwave, and millimeter wave ranges obtained with the <em>Reuven Ramaty High-Energy Solar Spectroscopic Imager</em>, <em>Solar Dynamics Observatory</em> (SDO), <em>Geostationary Operational Environmental Satellite</em>, <em>Radio Solar Telescope Network</em>, and <em>Bauman Moscow State Technical University millimeter</em> radio telescope RT-7.5. The main parameters of thermal and accelerated electrons were determined through X-ray spectral fitting assuming the homogeneous thermal source and thick-target model. From the data of the <em>Atmospheric Imaging Assembly</em>/SDO and differential-emission-measure calculations it is shown that the thermal coronal plasma gives a negligible contribution to the millimeter flare emission. Model calculations suggest that the observed increase of millimeter spectral flux with frequency is determined by gyrosynchrotron emission of high-energy (≳300 ≳300  keV) electrons in the chromosphere. The consequences of the results are discussed in the light of the flare-energy-release mechanisms.<br /></p>
dc.language.isoen
dc.publisherSpringer Netherlands
dc.titleMillimeter and X-Ray Emission from the 5 July 2012 Solar Flare
dc.identifier.urnURN:NBN:fi-fe2021042719015
dc.relation.volume293
dc.contributor.organizationfi=fysiikan ja tähtitieteen laitos, yhteiset|en=Department of Physics and Astronomy|
dc.contributor.organization-code2606700
dc.converis.publication-id30741852
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/30741852
dc.identifier.eissn1573-093X
dc.identifier.jour-issn0038-0938
dc.okm.affiliatedauthorSmirnova, Victoria
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeJournal article
dc.publisher.countryAlankomaatfi_FI
dc.publisher.countryNetherlandsen_GB
dc.publisher.country-codeNL
dc.relation.articlenumber50
dc.relation.doi10.1007/s11207-018-1269-6
dc.relation.ispartofjournalSolar Physics
dc.relation.issue3
dc.year.issued2018


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