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dc.date.accessioned2020-04-11T19:26:36Z
dc.date.available2020-04-11T19:26:36Z
dc.date.created2019-10-10T17:42:34Z
dc.date.issued2019
dc.identifier.citationGraham, David R. De Pontieu, Bart Walter Testa, Paola . Automated Detection of Rapid Variability of Moss Using SDO/AIA and Its Connection to the Solar Corona. Astrophysical Journal Letters. 2019, 880(1)
dc.identifier.urihttp://hdl.handle.net/10852/74495
dc.description.abstractActive region moss—the upper transition region of hot loops—was observed exhibiting rapid intensity variability on timescales of order 15 s by Testa et al. in a short time series (~150 s) data set from Hi-C (High-resolution Coronal Imager). The intensity fluctuations in the subarcsecond 193A images (~1.5 MK plasma) were uncharacteristic of steadily heated moss and were considered an indication of heating events connected to the corona. Intriguingly, these brightenings displayed a connection to the ends of transient hot loops seen in the corona. Following the same active region, AR11520, for 6 days, we demonstrate an algorithm designed to detect the same temporal variability in lower resolution Atmospheric Imaging Assembly (AIA) data, significantly expanding the number of events detected. Multiple analogous regions to the Hi-C data are successfully detected, showing moss that appears to "sparkle" prior to clear brightening of connected high-temperature loops; this is confirmed by the hot AIA channels and the isolated Fe xviii emission. The result is illuminating, as the same behavior has recently been shown by Polito et al. while simulating nanoflares with a beam of electrons depositing their energy in the lower atmosphere. Furthermore, the variability is localized mostly to the hot core of the region, hence we reinforce the diagnostic potential of moss variability as the driver of energy release in the corona. The ubiquitous nature of this phenomenon, and the ability to detect it in data with extended time series, and large fields of view, opens a new window into investigating the coronal heating mechanism.
dc.languageEN
dc.publisherInstitute of Physics Publishing Ltd.
dc.titleAutomated Detection of Rapid Variability of Moss Using SDO/AIA and Its Connection to the Solar Corona
dc.typeJournal article
dc.creator.authorGraham, David R.
dc.creator.authorDe Pontieu, Bart Walter
dc.creator.authorTesta, Paola
cristin.unitcode185,15,3,40
cristin.unitnameRosseland senter for solfysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1736213
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astrophysical Journal Letters&rft.volume=880&rft.spage=&rft.date=2019
dc.identifier.jtitleAstrophysical Journal Letters
dc.identifier.volume880
dc.identifier.issue1
dc.identifier.pagecount8
dc.identifier.doihttps://doi.org/10.3847/2041-8213/ab2f91
dc.identifier.urnURN:NBN:no-77602
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn2041-8205
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/74495/1/Graham_2019_ApJL_880_L12.pdf
dc.type.versionPublishedVersion
cristin.articleidL12
dc.relation.projectNFR/262622
dc.relation.projectNFR/251369


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