The Equilibrium of Coronal Loops Near Separatrices

Simple item page
dc.citation.articleNumber84en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber943en_US
dc.contributor.authorMason, Emily I.en_US
dc.contributor.authorAntiochos, Spiro K.en_US
dc.contributor.authorBradshaw, Stephenen_US
dc.date.accessioned2023-02-23T18:46:09Zen_US
dc.date.available2023-02-23T18:46:09Zen_US
dc.date.issued2023en_US
dc.description.abstractWe present numerical models from the field-aligned HYDrodynamics and RADiation code (HYDRAD) of a highly asymmetric closed coronal loop with near-singular expansion factor. This loop was chosen to simulate a coronal magnetic flux tube that passes close to a null point, as in the last set of closed loops under the fan surface of a coronal jet or a pseudostreamer. The loop has a very large cross section localized near the coronal null. The coronal heating was assumed to be uniform and steady. A siphon flow establishes itself within 4 hr of simulation time, flowing from the smaller-area footpoint to the larger-area footpoint, with high initial speeds dropping rapidly as the plasma approaches the null region. Observationally, this would translate to strong upflows on the order of 10 km s−1 from the footpoint rooted in the localized minority polarity, and weak downflows from the fan-surface footpoint on the order of a few kilometers per second, along with near-stationary plasma near the null region. We present the model results for two heating rates. In addition, we analyzed analogous Hinode EUV Imaging Spectrometer observations of null-point topologies, which show associated Doppler shifts in the plasma that correlate well with the simulation results in both direction and magnitude of the bulk velocity. We discuss the implications of our results for determining observationally the topology of the coronal magnetic field.en_US
dc.identifier.citationMason, Emily I., Antiochos, Spiro K. and Bradshaw, Stephen. "The Equilibrium of Coronal Loops Near Separatrices." <i>The Astrophysical Journal,</i> 943, (2023) IOP Publishing: https://doi.org/10.3847/1538-4357/acac85.en_US
dc.identifier.digitalMason_2023_ApJ_943_84en_US
dc.identifier.doihttps://doi.org/10.3847/1538-4357/acac85en_US
dc.identifier.urihttps://hdl.handle.net/1911/114470en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleThe Equilibrium of Coronal Loops Near Separatricesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Mason_2023_ApJ_943_84.pdf
Size:
858.92 KB
Format:
Adobe Portable Document Format
Download
Collections
Faculty Publications