caa a22 4500 445816066 CHVBK 20180317145228.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s11214-010-9710-7 doi (NATIONALLICENCE)springer-10.1007/s11214-010-9710-7 Large-scale Bright Fronts in the Solar Corona: AReview of"EIT waves” [Elektronische Daten] [Peter Gallagher, David Long] "EIT waves” are large-scale coronal bright fronts (CBFs) that were first observed in 195Å images obtained using the Extreme-ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO). Commonly called "EIT waves”, CBFs typically appear as diffuse fronts that propagate pseudo-radially across the solar disk at velocities of 100-700km s−1 with front widths of 50-100Mm. As their speed is greater than the quiet coronal sound speed (c s≤200km s−1) and comparable to the local Alfvén speed (v A≤1000km s−1), they were initially interpreted as fast-mode magnetoacoustic waves ($v_{f}=(c_{s}^{2} + v_{A}^{2})^{1/2}$). Their propagation is now known to be modified by regions where the magnetosonic sound speed varies, such as active regions and coronal holes, but there is also evidence for stationary CBFs at coronal hole boundaries. The latter has led to the suggestion that they may be a manifestation of a processes such as Joule heating or magnetic reconnection, rather than a wave-related phenomena. While the general morphological and kinematic properties of CBFs and their association with coronal mass ejections have now been well described, there are many questions regarding their excitation and propagation. In particular, the theoretical interpretation of these enigmatic events as magnetohydrodynamic waves or due to changes in magnetic topology remains the topic of much debate. Springer Science+Business Media B.V., 2010 Corona nationallicence Waves nationallicence Solar activity nationallicence Coronal mass ejections nationallicence EIT waves nationallicence Gallagher Peter Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland aut Long David Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland aut Space Science Reviews Springer Netherlands 158/2-4(2011-07-01), 365-396 0038-6308 158:2-4<365 2011 158 11214 https://doi.org/10.1007/s11214-010-9710-7 text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11214-010-9710-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gallagher Peter Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland aut NATIONALLICENCE 700 1- Long David Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland aut NATIONALLICENCE 773 0- Space Science Reviews Springer Netherlands 158/2-4(2011-07-01), 365-396 0038-6308 158:2-4<365 2011 158 11214 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer