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A FULL STUDY ON THE SUN-EARTH CONNECTION OF AN EARTH-DIRECTED CME MAGNETIC FLUX ROPE

Vemareddy, Panditi ; Mishra, Wageesh

The Astrophysical journal, 2015-11, Vol.814 (1), p.1-18 [Periódico revisado por pares]

United States: The American Astronomical Society

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  • Título:
    A FULL STUDY ON THE SUN-EARTH CONNECTION OF AN EARTH-DIRECTED CME MAGNETIC FLUX ROPE
  • Autor: Vemareddy, Panditi ; Mishra, Wageesh
  • Assuntos: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Channels ; COMPARATIVE EVALUATIONS ; Coronal mass ejection ; Drag ; Dynamical systems ; Dynamics ; FILAMENTS ; HELIOSPHERE ; Instability ; KINK INSTABILITY ; MAGNETIC FIELDS ; MAGNETIC FLUX ; MASS ; ORIENTATION ; SOLAR CORONA ; SOLAR WIND ; solar-terrestrial relations ; SPACE VEHICLES ; Stability ; SUN ; Sun: coronal mass ejections (CMEs) ; Sun: filaments, prominences ; Sun: flares ; Sun: heliosphere ; Sun: magnetic fields ; VELOCITY
  • É parte de: The Astrophysical journal, 2015-11, Vol.814 (1), p.1-18
  • Notas: ApJ99053
    The Sun
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: ABSTRACT We present an investigation of an eruption event of a coronal mass ejection (CME) magnetic flux rope (MFR) from the source active region (AR) NOAA 11719 on 2013 April 11 utilizing observations from the Solar Dynamic Observatory, the Solar Terrestrial Relations Observatory, the Solar and Heliospheric Observatory, and the WIND spacecraft. The source AR consists of a pre-existing sigmoidal structure stacked over a filament channel which is regarded as an MFR system. EUV observations of low corona suggest further development of this MFR system by added axial flux through tether-cutting reconnection of loops at the middle of the sigmoid under the influence of continuous slow flux motions for two days. Our study implies that the MFR system in the AR is initiated to upward motion by kink instability and further driven by torus instability. The CME morphology, captured in simultaneous three-point coronagraph observations, is fitted with a Graduated Cylindrical Shell (GCS) model and discerns an MFR topology with its orientation aligning with a magnetic neutral line in the source AR. This MFR expands self-similarly and is found to have source AR twist signatures in the associated near-Earth magnetic cloud (MC). We further derived the kinematics of this CME propagation by employing a plethora of stereoscopic as well as single-spacecraft reconstruction techniques. While stereoscopic methods perform relatively poorly compared to other methods, fitting methods worked best in estimating the arrival time of the CME compared to in situ measurements. Supplied with the values of constrained solar wind velocity, drag parameter, and three-dimensional kinematics from the GCS fit, we construct CME kinematics from the drag-based model consistent with in situ MC arrival.
  • Editor: United States: The American Astronomical Society
  • Idioma: Inglês

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