Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26402
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kowalski, Adam F. | en_US |
dc.contributor.author | CAUZZI, Gianna | en_US |
dc.contributor.author | Fletcher, Lyndsay | en_US |
dc.date.accessioned | 2020-07-09T10:33:48Z | - |
dc.date.available | 2020-07-09T10:33:48Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26402 | - |
dc.description | The research has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under agreement 606862 (F-CHROMA). | en_US |
dc.description.abstract | We analyze optical spectra of a two-ribbon, long-duration C1.1 flare that occurred on 2011 August 18 within AR 11271 (SOL2011-08-18T15:15). The impulsive phase of the flare was observed with a comprehensive set of space-borne and ground-based instruments, which provide a range of unique diagnostics of the lower flaring atmosphere. Here we report the detection of enhanced continuum emission, observed in low-resolution spectra from 3600 Å to 4550 Å acquired with the Horizontal Spectrograph at the Dunn Solar Telescope. A small, <=0.''5 (1015 cm2) penumbral/umbral kernel brightens repeatedly in the optical continuum and chromospheric emission lines, similar to the temporal characteristics of the hard X-ray variation as detected by the Gamma-ray Burst Monitor on the Fermi spacecraft. Radiative-hydrodynamic flare models that employ a nonthermal electron beam energy flux high enough to produce the optical contrast in our flare spectra would predict a large Balmer jump in emission, indicative of hydrogen recombination radiation from the upper flare chromosphere. However, we find no evidence of such a Balmer jump in the bluemost spectral region of the continuum excess. Just redward of the expected Balmer jump, we find evidence of a "blue continuum bump" in the excess emission which may be indicative of the merging of the higher order Balmer lines. The large number of observational constraints provides a springboard for modeling the blue/optical emission for this particular flare with radiative-hydrodynamic codes, which are necessary to understand the opacity effects for the continuum and emission line radiation at these wavelengths. | en_US |
dc.language.iso | eng | en_US |
dc.title | Optical Spectral Observations of a Flickering White-light Kernel in a C1 Solar Flare | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1088/0004-637X/798/2/107 | en_US |
dc.identifier.scopus | 2-s2.0-84924301787 | en_US |
dc.identifier.isi | 000350853700042 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.1088/0004-637X/798/2/107 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 798 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 107 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 3 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.contributor.country | GBR | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2015ApJ...798..107K | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_1 Solar and interplanetary physics | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0002-6116-7301 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Kowalski_2015_ApJ_798_107.pdf | Pdf editoriale | 2.16 MB | Adobe PDF | View/Open |
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