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dc.contributor.authorGALLAGHER, PETERen
dc.contributor.authorBYRNE, JASONen
dc.contributor.authorMCATEER, ROBERTen
dc.date.accessioned2011-04-05T15:31:35Z
dc.date.available2011-04-05T15:31:35Z
dc.date.issued2009en
dc.date.submitted2009en
dc.identifier.citationByrne, JP, Gallagher, PT, McAteer, RTJ, Young, CA, The kinematics of coronal mass ejections using multiscale methods, ASTRONOMY & ASTROPHYSICS, 495, 1, 2009, 325 - 334en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/54520
dc.descriptionPUBLISHEDen
dc.description.abstractAims. The diffuse morphology and transient nature of coronal mass ejections (CMEs) make them difficult to identify and track using traditional image processing techniques. We apply multiscale methods to enhance the visibility of the faint CME front. This enables an ellipse characterisation to objectively study the changing morphology and kinematics of a sample of events imaged by the Large Angle Spectrometric Coronagraph (LASCO) onboard the Solar and Heliospheric Observatory (SOHO) and the Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) onboard the Solar Terrestrial Relations Observatory (STEREO). The accuracy of these methods allows us to test the CMEs for non-constant acceleration and expansion. Methods. We exploit the multiscale nature of CMEs to extract structure with a multiscale decomposition, akin to a Canny edge detector. Spatio-temporal filtering highlights the CME front as it propagates in time. We apply an ellipse parameterisation of the front to extract the kinematics (height, velocity, acceleration) and changing morphology (width, orientation). Results. The kinematic evolution of the CMEs discussed in this paper have been shown to differ from existing catalogues. These catalogues are based upon running-difference techniques that can lead to over-estimating CME heights. Our resulting kinematic curves are not well-fitted with the constant acceleration model. It is shown that some events have high acceleration below 5 . Furthermore, we find that the CME angular widths measured by these catalogues are over-estimated, and indeed for some events our analysis shows non-constant CME expansion across the plane-of-sky.en
dc.description.sponsorshipThis work is supported by grants from Science Foundation Ireland's Research Frontiers Programme and NASA's Living With A Star Program.en
dc.format.extent325 - 334en
dc.language.isoenen
dc.relation.ispartofseriesASTRONOMY & ASTROPHYSICSen
dc.relation.ispartofseries495en
dc.relation.ispartofseries1en
dc.rightsYen
dc.subjectAstrophysicsen
dc.subjectCoronal Mass ejections (CMEs)en
dc.titleThe kinematics of coronal mass ejections using multiscale methodsen
dc.typeJournal Articleen
dc.contributor.sponsorMarie Curieen
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/gallagpten
dc.identifier.peoplefinderurlhttp://people.tcd.ie/mcateerten
dc.identifier.rssinternalid72428en
dc.identifier.rssurihttp://dx.doi.org/10.1051/0004-6361:200809811en


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