Quadrature Observations of Wave and Non-Wave Components and Their Decoupling in an Extreme-Ultraviolet Wave Event

Abstract

We report quadrature observations of an extreme-ultraviolet (EUV) wave event on 2011 January 27 obtained by the Extreme Ultraviolet Imager (EUVI) onboard \emph{Solar Terrestrial Relations Observatory} (\emph{STEREO}), and the Atmospheric Imaging Assembly (AIA) onboard the \emph{Solar Dynamics Observatory} (\emph{SDO}). Two components are revealed in the EUV wave event. A primary front is launched with an initial speed of $\sim$440 km s${}^{-1}$. It appears significant emission enhancement in the hotter channel but deep emission reduction in the cooler channel. When the primary front encounters a large coronal loop system and slows down, a secondary much fainter front emanates from the primary front with a relatively higher starting speed of $\sim$550 km s${}^{-1}$. Afterwards the two fronts propagate independently with increasing separation. The primary front finally stops at a magnetic separatrix, while the secondary front travels farther before it fades out. In addition, upon the arrival of the secondary front, transverse oscillations of a prominence are triggered. We suggest that the two components are of different natures. The primary front belongs to a non-wave coronal mass ejection (CME) component, which can be reasonably explained with the field-line stretching model. The multi-temperature behavior may be caused by considerable heating due to the nonlinear adiabatic compression on the CME frontal loop. For the secondary front, most probably it is a linear fast-mode magnetohydrodynamic (MHD) wave that propagates through a medium of the typical coronal temperature. X-ray and radio data provide us with complementary evidence in support of the above scenario.

21 pages, 8 figures, accepted for publication in ApJ

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• Statistical Analysis of Large-scale EUV Waves Observed by STEREO/EUVI
• Simultaneous transverse and longitudinal oscillations in a quiescent prominence triggered by a coronal jet
• A New Multi-wavelength Solar Telescope: Optical and Near-infrared Solar Eruption Tracer (ONSET)
• Two Kinds of Dynamic Behavior in a Quiescent Prominence Observed by the NVST
• Large-amplitude longitudinal oscillations in a solar filament
• Longitudinal filament oscillations enhanced by two C-class flares
• Mode-Conversion of a Solar Extreme-Ultraviolet Wave over a Coronal Cavity
• Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets
• Simultaneous transverse oscillations of a coronal loop and a filament excited by a circular-ribbon flare
• Coronal and Chromospheric Signatures of Large-Scale Disturbances Associated with a Major Solar Eruption
• Limb Observations of Global Solar Coronal Extreme-ultraviolet Wavefronts: The Inclination, Kinematics, Coupling with the Expanding Coronal Mass Ejections, and Connection with the Coronal Mass Ejection Driven Shocks