Case Study of Four Homologous Large-scale Coronal Waves Observed on 2010 April 28 and 29

On 2010 April 28 and 29, the Solar TErrestrial Relations Observatory B/Extreme Ultraviolet Imager observed four homologous large-scale coronal waves, the so-called EIT-waves, within 8 hr. All waves emerged from the same source active region, were accompanied by weak flares and faint coronal mass eje...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2011-02, Vol.727 (2), p.L43-jQuery1323918494255='48'
Main Authors: Kienreich, I. W, Veronig, A. M, Muhr, N, Temmer, M, Vršnak, B, Nitta, N
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ATMOSPHERES
CORRELATIONS
DIMENSIONLESS NUMBERS
DISTURBANCES
HYDROMAGNETIC WAVES
MACH NUMBER
MAGNETOACOUSTIC WAVES
MASS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CORONA
SOLAR FLARES
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CORONAE
STELLAR FLARES
VELOCITY
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Summary:On 2010 April 28 and 29, the Solar TErrestrial Relations Observatory B/Extreme Ultraviolet Imager observed four homologous large-scale coronal waves, the so-called EIT-waves, within 8 hr. All waves emerged from the same source active region, were accompanied by weak flares and faint coronal mass ejections, and propagated into the same direction at constant velocities in the range of ~220-340 km s--1. The last of these four coronal wave events was the strongest and fastest, with a velocity of 337 ? 31 km s--1 and a peak perturbation amplitude of ~1.24, corresponding to a magnetosonic Mach number of M ms ~ 1.09. The magnetosonic Mach numbers and velocities of the four waves are distinctly correlated, suggestive of the nonlinear fast-mode magnetosonic wave nature of the events. We also found a correlation between the magnetic energy buildup times and the velocity and magnetosonic Mach number.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/727/2/L43