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dc.contributor.authorSyntelis, P.
dc.contributor.authorGontikakis, C.
dc.contributor.authorPatsourakos, S.
dc.contributor.authorTsinganos, K.
dc.identifier.citationSyntelis , P , Gontikakis , C , Patsourakos , S & Tsinganos , K 2016 , ' The spectroscopic imprint of the pre-eruptive configuration resulting into two major coronal mass ejections ' , Astronomy & Astrophysics , vol. 588 , A16 .
dc.identifier.otherBibCode: 2016A&A...588A..16S
dc.identifier.otherORCID: /0000-0002-6377-0243/work/77131785
dc.descriptionP.S acknowledges financial support from the programme Aristotelis/SIEMENS at the NOA.en
dc.description.abstractAims: We present a spectroscopic analysis of the pre-eruptive configuration of active region NOAA 11429, prior to two very fast coronal mass ejections (CMEs) on March 7, 2012 that are associated with this active region. We study the thermal components and the dynamics associated with the ejected flux ropes. Methods: Using differential emission measure (DEM) analysis of Hinode/EIS and SDO/AIA observations, we identify the emission components of both the flux rope and the host active region. We then follow the time evolution of the flux rope emission components by using AIA observations. The plasma density and the Doppler and non-thermal velocities associated with the flux ropes are also calculated from the EIS data. Results: The eastern and western parts of the active region, in which the two different fast CMEs originated during two X-class flares, were studied separately. In both regions we identified an emission component in the temperature range of log T = 6.8-7.1 associated with the presence of flux ropes. The time evolution of the eastern region showed an increase in the mean DEM in this temperature range by an order of magnitude, 5 h prior to the first CME. This was associated with a gradual rise and heating of the flux rope as manifested by blue-shifts and increased non-thermal velocities in Ca xv 200.97 Å, respectively. An overall upward motion of the flux ropes was measured (relative blue-shifts of ~12 km s-1). The measured electron density was found to be 4× 109-2 × 1010 cm-3 (using the ratio of Ca xv 181.90 Å over Ca xv 200.97 Å). We compare our findings with other works on the same AR to provide a unified picture of its evolution.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.subjectSun: coronal mass ejections (CMEs)en
dc.subjectSun: flaresen
dc.subjectSun: activityen
dc.subjectSun: coronaen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe spectroscopic imprint of the pre-eruptive configuration resulting into two major coronal mass ejectionsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.description.statusPeer revieweden

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