E-Print Archive

There are 4438 abstracts currently viewable.


Search:

Advanced Search
Options
Main Page Add New E-Print Submitter
Information
Feedback
News Help/FAQ About Preferences
Manage Key Phrase
Notification
On the linear coupling between fast and slow MHD waves due to line-tying effects View all abstracts by submitter

Jaume Terradas   Submitted: 2010-11-04 02:46

Oscillations in coronal loops are usually interpreted in terms of uncoupled magnetohydrodynamic (MHD) waves. Examples of these waves are standing transverse motions, interpreted as the kink MHD modes, and propagating slow modes, commonly reported at the loop footpoints. Here we study a simple system in which fast and slow MHD waves are coupled. The goal is to understand the fingerprints of the coupling when boundary conditions are imposed in the model. The reflection problem of a fast and slow MHD wave interacting with a rigid boundary, representing the line-tying effect of the photosphere, is analytically investigated. Both propagating and standing waves are analysed and the time-dependent problem of the excitation of these waves is considered. An obliquely incident fast MHD wave on the photosphere inevitably generates a slow mode. The frequency of the generated slow mode at the photosphere is exactly the same as the frequency of the incident fast MHD mode, but its wavelength is much smaller, assuming that the sound speed is smaller than the Alfvén speed. The main signatures of the generated slow wave are density fluctuations at the loop footpoints. We have derived a simple formula that relates the velocity amplitude of the transverse standing mode with the density enhancements at the footpoints due to the driven slow modes. Using these results it is shown that there are possible evidences in the observations of the coupling between these two modes.

Authors: Terradas, J., Andries, J., Verwichte, E.
Projects: None

Publication Status: A&A(submitted)
Last Modified: 2010-11-04 07:35
Go to main E-Print page  Damping of longitudinal magneto-acoustic oscillations in slowly varying coronal plasma  Driving Mechanism and Onset Condition of a Confined Eruption  Edit Entry  Download Preprint  Delete Entry 

Key
Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
Variations of the Internal Asymmetries of Sunspot Groups During their Decay
Partial Eruption, Confinement, and Twist Buildup and Release of a Double-decker Filament
Overdense Threads in the Solar Corona Induced by Torsional Alfvén Waves
Implications of spicule activity on coronal loop heating and catastrophic cooling
The Magnetic Origin of Solar Campfires
On the evolution of a sub-C class flare: a showcase for the capabilities of the revamped Catania Solar Telescope
Direct evidence that twisted flux tube emergence creates solar active regions
Numerical Simulation of a Fundamental Mechanism of Solar Eruption with Different Magnetic Flux Distributions
Toward Improved Understanding of Magnetic Fields Participating in Solar Flares: Statistical Analysis of Magnetic Field within Flare Ribbons
Torus-Stable Zone Above Starspots
Constraining the CME Core Heating and Energy Budget with SOHO/UVCS
The solar corona as an active medium for magnetoacoustic waves
Rapid Evolution of Bald Patches in a Major Solar Eruption
Evaluating Pointing Strategies for Future Solar Flare Missions
Common origin of quasi-periodic pulsations in microwave and decimetric solar radio bursts
Thomson scattering in the lower corona in the presence of sunspots
The Spatial and Temporal Variations of Turbulence in a Solar Flare
Investigations of Sizes and Dynamical Motions of Solar Photospheric Granules by a Novel Granular Segmenting Algorithm
Millennial oscillations of solar irradiance and magnetic field at Earth in 600-2600
Plasma turbulence generated in 3D current sheet with magnetic islands

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey



© 2000-2020 Solar Physics Group - Montana State University