scholarly journals Magneto-seismology of solar atmospheric loops by means of longitudinal oscillations

2011 ◽  
Vol 7 (S286) ◽  
pp. 437-440
Author(s):  
M. Luna-Cardozo ◽  
G. Verth ◽  
R. Erdélyi
Keyword(s):  
Solar Atmosphere ◽  
Wave Theory ◽  
Observational Evidence ◽  
Coronal Loops ◽  
Density Structure ◽  
Magnetoacoustic Waves

AbstractThere is increasingly strong observational evidence that slow magnetoacoustic modes arise in the solar atmosphere. Solar magneto-seismology is a novel tool to derive otherwise directly un-measurable properties of the solar atmosphere when magnetohydrodynamic (MHD) wave theory is compared to wave observations. Here, MHD wave theory is further developed illustrating how information about the magnetic and density structure along coronal loops can be determined by measuring the frequencies of the slow MHD oscillations. The application to observations of slow magnetoacoustic waves in coronal loops is discussed.

Slow magnetohydrodynamic waves in the solar atmosphere

2005 ◽  
Vol 364 (1839) ◽  
pp. 447-460 ◽  
Author(s):  
B Roberts
Keyword(s):  
Solar Atmosphere ◽  
Gordon Equation ◽  
Observational Evidence ◽  
Stratified Medium ◽  
Coronal Loops ◽  
Slow Mode ◽  
Magnetohydrodynamic Equations ◽  
Magnetohydrodynamic Waves ◽  
Klein Gordon ◽  
Special Case

There is increasingly strong observational evidence that slow magnetoacoustic modes arise in the solar atmosphere, either as propagating or standing waves. Sunspots, coronal plumes and coronal loops all appear to support slow modes. Here we examine theoretically how the slow mode may be extracted from the magnetohydrodynamic equations, considering the special case of a vertical magnetic field in a stratified medium: the slow mode is described by the Klein–Gordon equation. We consider its application to recent observations of slow waves in coronal loops.

Propagation of Fast Magnetoacoustic Waves in Stratified Solar Atmosphere

2006 ◽  
Vol 23 (2) ◽  
pp. 399-402 ◽  
Author(s):  
Zheng Hui-Nan ◽  
Zhang Yuan-Yuan ◽  
Wang Shui ◽  
Wang Chuan-Bing ◽  
Li Yi
Keyword(s):  
Solar Atmosphere ◽  
Magnetoacoustic Waves

PROPAGATING SLOW MAGNETOACOUSTIC WAVES IN CORONAL LOOPS OBSERVED BYHINODE/EIS

2009 ◽  
Vol 696 (2) ◽  
pp. 1448-1460 ◽  
Author(s):  
T. J. Wang ◽  
L. Ofman ◽  
J. M. Davila
Keyword(s):  
Coronal Loops ◽  
Magnetoacoustic Waves

scholarly journals Slow magnetoacoustic waves in coronal loops: EIT and TRACE

2001 ◽  
Vol 370 (2) ◽  
pp. 591-601 ◽  
Author(s):  
E. Robbrecht ◽  
E. Verwichte ◽  
D. Berghmans ◽  
J. F. Hochedez ◽  
S. Poedts ◽  
...  
Keyword(s):  
Coronal Loops ◽  
Magnetoacoustic Waves

Magnetohydrodynamic Waves

2020 ◽  
Author(s):  
V.M. Nakariakov
Keyword(s):  
Magnetic Field ◽  
Wave Theory ◽  
Alfven Wave ◽  
Mhd Waves ◽  
Phase Mixing ◽  
Weakly Nonlinear ◽  
Magnetohydrodynamic Waves ◽  
Magnetoacoustic Waves ◽  
Uniform Medium ◽  
Corona Of The Sun

Magnetohydrodynamic (MHD) waves represent one of the macroscopic processes responsible for the transfer of the energy and information in plasmas. The existence of MHD waves is due to the elastic and compressible nature of the plasma, and by the effect of the frozen-in magnetic field. Basic properties of MHD waves are examined in the ideal MHD approximation, including effects of plasma nonuniformity and nonlinearity. In a uniform medium, there are four types of MHD wave or mode: the incompressive Alfvén wave, compressive fast and slow magnetoacoustic waves, and non-propagating entropy waves. MHD waves are essentially anisotropic, with the properties highly dependent on the direction of the wave vector with respect to the equilibrium magnetic field. All of these waves are dispersionless. A nonuniformity of the plasma may act as an MHD waveguide, which is exemplified by a field-aligned plasma cylinder that has a number of dispersive MHD modes with different properties. In addition, a smooth nonuniformity of the Alfvén speed across the field leads to mode coupling, the appearance of the Alfvén continuum, and Alfvén wave phase mixing. Interaction and self-interaction of weakly nonlinear MHD waves are discussed in terms of evolutionary equations. Applications of MHD wave theory are illustrated by kink and longitudinal waves in the corona of the Sun.

Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops

Solar Physics ◽  
2007 ◽  
Vol 246 (1) ◽  
pp. 187-212 ◽  
Author(s):  
L. Di G. Sigalotti ◽  
C. A. Mendoza-Briceño ◽  
M. Luna-Cardozo
Keyword(s):  
Coronal Loops ◽  
Magnetoacoustic Waves
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