GONG Catalog of Solar Filament Oscillations Near Solar Maximum

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dc.contributor.author Luna, M.
dc.contributor.author Karpen, J.
dc.contributor.author Ballester Mortes, José Luis
dc.contributor.author Muglach, K.
dc.contributor.author Terradas, J.
dc.contributor.author Kucera, T.
dc.contributor.author Gilbert, H.
dc.date.accessioned 2019-01-18T13:27:34Z
dc.date.available 2019-01-18T13:27:34Z
dc.identifier.uri http://hdl.handle.net/11201/148820
dc.description.abstract [eng] We have cataloged $196$ filament oscillations from the Global Oscillation Network Group Hα network data during several months near the maximum of solar cycle 24 (2014 January-June). Selected examples from the catalog are described in detail, along with our statistical analyses of all events. Oscillations were classified according to their velocity amplitude: $106$ small-amplitude oscillations (SAOs), with velocities 10 $\mathrm{km}\,{{\rm{s}}}^{-1}$. Both SAOs and LAOs are common, with one event of each class every two days on the visible side of the Sun. For nearly half of the events, we identified their apparent trigger. The period distribution has a mean value of 58 ± 15 minutes for both types of oscillations. The distribution of the damping time per period peaks at τ/P = 1.75 and 1.25 for SAOs and LAOs, respectively. We confirmed that LAO damping rates depend nonlinearly on the oscillation velocity. The angle between the direction of motion and the filament spine has a distribution centered at 27° for all filament types. This angle agrees with the observed direction of filament-channel magnetic fields, indicating that most of the cataloged events are longitudinal (i.e., undergo field-aligned motions). We applied seismology to determine the average radius of curvature in the magnetic dips, R ≈ 89 Mm, and the average minimum magnetic field strength, B ≈ 16 G. The catalog is available to the community online and is intended to be expanded to cover at least 1 solar cycle.
dc.format application/pdf
dc.relation.isformatof Reproducció del document publicat a: https://doi.org/10.3847/1538-4365/aabde7
dc.relation.ispartof The Astrophysical Journal, 2018, vol. 236, num. 35, p. 1-30
dc.rights (c) American Astronomical Society, 2018
dc.subject.classification 52 - Astronomia. Astrofísica. Investigació espacial. Geodèsia
dc.subject.classification 53 - Física
dc.subject.other 52 - Astronomy. Astrophysics. Space research. Geodesy
dc.subject.other 53 - Physics
dc.title GONG Catalog of Solar Filament Oscillations Near Solar Maximum
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2019-01-18T13:27:34Z
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.identifier.doi https://doi.org/10.3847/1538-4365/aabde7


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