The dependence of the EIT wave velocity on the magnetic field strength

Abstract

"EIT waves" are a wavelike phenomenon propagating in the corona, which were initially observed in the extreme ultraviolet (EUV) wavelength by the EUV Imaging Telescope (EIT). Their nature is still elusive, with the debate between fast-mode wave model and non-wave model. In order to distinguish between these models, we investigate the relation between the EIT wave velocity and the local magnetic field in the corona. It is found that the two parameters show significant negative correlation in most of the EIT wave fronts, {\it i.e.}, EIT wave propagates more slowly in the regions of stronger magnetic field. Such a result poses a big challenge to the fast-mode wave model, which would predict a strong positive correlation between the two parameters. However, it is demonstrated that such a result can be explained by the fieldline stretching model, \emph{i.e.,} that "EIT waves" are apparently-propagating brightenings, which are generated by successive stretching of closed magnetic field lines pushed by the erupting flux rope during coronal mass ejections (CMEs).

11 pages, 8 figures, accepted for publication in Solar Phys

References in corpus (10)

• Swift BAT Survey of AGN
• High cadence observations of a global coronal wave by EUVI/STEREO
• The Kinematics of a Globally Propagating Disturbance in the Solar Corona
• Numerical Simulation of an EUV Coronal Wave Based on the February 13, 2009 CME Event Observed by STEREO
• Are "EIT Waves" Fast-Mode MHD Waves?
• Numerical Experiments of Wave-Like Phenomena Caused by the Disruption of an Unstable Magnetic Configuration
• What is the Nature of EUV Waves? First STEREO 3D Observations and Comparison with Theoretical Models
• The Relation between EIT Waves and Coronal Mass Ejections
• Absorption Phenomena and a Probable Blast Wave in the 13 July 2004 Eruptive Event
• Initiation and propagation of coronal mass ejections

Cited by in corpus (8)

• Observations and Interpretation of a Low Coronal Shock Wave Observed in the EUV by the SDO/AIA
• First Evidence of Coexisting EIT Wave and Coronal Moreton Wave from SDO/AIA Observations
• Secondary Waves, and/or the "Reflection" From and "Transmission" Through a Coronal Hole of an EUV Wave Associated With the 2011 February 15 X2.2 Flare Observed With SDO/AIA and STEREO/EUVI
• Coronal Shock Waves, EUV waves, and Their Relation to CMEs. I. Reconciliation of "EIT waves", Type II Radio Bursts, and Leading Edges of CMEs
• A New Multi-wavelength Solar Telescope: Optical and Near-infrared Solar Eruption Tracer (ONSET)
• Can a Fast-mode EUV Wave Generate a Stationary Front?
• Coronal Shock Waves, EUV Waves, and Their Relation to CMEs. III. Shock-Associated CME/EUV Wave in an Event with a Two-Component EUV Transient
• Global Coronal Waves