The Dependence of the EIT Wave Velocity on the Magnetic Field Strength |
| |
Authors: | H Q Yang P F Chen |
| |
Institution: | (1) Center for Earth Observing and Space Research, College of Science, George Mason University, Fairfax, VA 22030, USA;(2) Naval Research Laboratory, Space Science Division, Washington, DC 20375, USA;(3) Interferometrics, Inc., 13454 Sunrise Valley Drive, Herndon, VA 20171, USA;(4) USRA, 10211 Wincopin Circle, Suite 500, Columbia, MD 2104, USA |
| |
Abstract: | “EIT waves” are a wavelike phenomenon propagating in the corona, which was initially observed in the extreme ultraviolet (EUV)
wavelength by the EUV Imaging Telescope (EIT). Their nature is still elusive, with the debate on-going 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, i.e., the 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, i.e., that “EIT waves” are the propagation of apparent brightenings, which are generated by successive stretching of closed magnetic
field lines pushed by the erupting flux rope during coronal mass ejections (CMEs). |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|