Journal ArticleDOI
Wave propagation in a magnetic cylinder
P. M. Edwin,B. Roberts +1 more
TLDR
In this article, the authors investigated the nature of oscillations in a magnetic cylinder embedded in magnetic environment and showed that the standard slender flux tube analysis of a kink mode in a cylinder excludes the possibility of a second mode, which arises under photospheric conditions.Abstract:
The nature of oscillations in a magnetic cylinder embedded in a magnetic environment is investigated. It is shown that the standard slender flux tube analysis of a kink mode in a cylinder excludes the possibility of a second mode, which arises under photospheric conditions. Under coronal conditions, two widely separated classes of oscillation can be freely sustained, one on an acoustic time-scale and the other on an Alfvenic time-scale. The acoustic-type oscillations are always present, but the much shorter period, Alfvenic-type, oscillations arise only in high density (strictly, low Alfven velocity) loops. An application to waves in fibrils is also given, and suggests (following Wentzel, 1979) that they are fast kink waves propagating in a density enhancement.read more
Citations
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Numerical simulations of fast MHD waves in a coronal plasma
K. Murawski,B. Roberts +1 more
TL;DR: In this article, the authors studied the temporal evolution of ducted waves in coronal loops (represented by smoothed slabs of enhanced gas density embedded within a uniform magnetic field) by means of numerical simulations and showed that there is an energy leakage from the slab associated with the propagation of wave packets which exhibit periodic, quasi-periodic and decay phases.
Journal ArticleDOI
First evidence of interaction between longitudinal and transverse waves in solar magnetic elements
TL;DR: In this paper, the authors studied the transversal and longitudinal velocity oscillations in small magnetic elements and found buffeting-induced transverse oscillations with velocity amplitudes of the order of 1-2 km s −1 and ∼0.4 km s−1, respectively.
Journal ArticleDOI
Fast magnetoacoustic wave trains of sausage symmetry in cylindrical waveguides of the solar corona
TL;DR: In this paper, the effects of cylindrical geometry on the fast sausage wave train formation were investigated, and the wave trains were found to have pronounced period modulation, with the longer instant period seen in the beginning of the wave train.
Journal ArticleDOI
Observations of Coronal Mass Ejections with the Coronal Multichannel Polarimeter
TL;DR: In this article, a list of CMEs observed by CoMP was identified and the first results of these observations were presented, showing that CME are usually associated with greatly increased Doppler shift and enhanced line width.
Journal ArticleDOI
Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey
James A. G. Jackman,Peter J. Wheatley,Chloe E. Pugh,Dmitrii Y. Kolotkov,Anne-Marie Broomhall,Grant M. Kennedy,Simon J. Murphy,Roberto Raddi,Roberto Raddi,Matthew R. Burleigh,Sarah L. Casewell,Philipp Eigmüller,Philipp Eigmüller,Edward Gillen,Maximilian N. Günther,James S. Jenkins,Tom Louden,James McCormac,Liam Raynard,Katja Poppenhaeger,Stéphane Udry,Christopher A. Watson,Richard G. West +22 more
TL;DR: In this paper, the authors used data collected under the NGTS project at the ESO La Silla Paranal Observatory to perform a survey of the data from the Gaia mission.
References
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Journal ArticleDOI
Elastic Waves in Layered Media
TL;DR: In this paper, Elastic Waves in Layered Media (ELMW) are used to describe the properties of layered media in a geologiska foreningen i Stockholm Forhandlingar.
Journal ArticleDOI
Wave propagation in a magnetically structured atmosphere
TL;DR: In this paper, the authors investigate the occurrence of magnetoacoustic surface waves at a single magnetic interface and consider in detail the case where one side of the interface is field-free.
Journal ArticleDOI
Wave propagation in a magnetically structured atmosphere: III: The slab in a magnetic environment
P.M. Edwin,B. Roberts +1 more
TL;DR: In this paper, the propagation of waves in a magnetic slab embedded in magnetic environment is investigated and possible modes of propagation are examined from the general dispersion relation, both analytically and numerically, for disturbances which are evanescent in the environment.