E-Print Archive

There are 3977 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
Alfvén instability of steady state flux tubes. Isothermal flow View all abstracts by submitter

Youra Taroyan   Submitted: 2011-09-15 05:24

Context. MHD instabilities are expected to play an important role in the dynamics and energetics of the solar atmosphere.

Aims. One application of a recently discovered MHD instability to an open magnetic flux tube is investigated. The flux tube is gravitationally stratified and permeated by a smooth isothermal flow.

Methods. The equilibrium structure is derived, and the stability of the tube with respect to small amplitude torsional perturbations generated at the footpoint by random convective motions analysed.

Results. It is shown that torsional perturbations are exponentially amplified in time if a narrow region exists where the flux tube rapidly expands while the plasma is flowing away from the footpoint. No high flow speeds are required for the instability to set in.

Conclusions. These obtained results may account for the nonthermal broadenings associated with upflows in magnetic regions of the lower solar atmosphere. However, additional studies that incorporate temperature variations are needed for more robust conclusions.


Authors: Taroyan, Y.
Projects: None

Publication Status: A&A 533, A68 (2011)
Last Modified: 2011-09-16 08:42
Go to main E-Print page  Nonlinear Force-Free Extrapolation of Emerging Flux with a Global Twist and Serpentine Fine Structures  Benchmarking atomic data for the CHIANTI atomic database: coronal lines observed by Hinode EIS  Edit Entry  Download Preprint  Submitter's Homepage 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
Energy transport and heating by torsional Alfvén waves propagating from the photosphere to the corona in the quiet Sun
A Two-Step Magnetic Reconnection in a Confined X-class Flare in Solar Active Region 12673
Lifetimes and Emergence/Decay Rates of Star Spots on Solar-type Stars Estimated by Kepler Data in Comparison with Those of Sunspots
IRIS and SDO Observations of Solar Jetlets Resulting from Network-edge Flux Cancelation
Si IV Resonance Line Emission During Solar Flares: Non-LTE, Non-equilibrium, Radiation Transfer Simulations
Study of current sheets in the wake of two crossing filaments eruption
Quasi-periodic fast propagating magnetoacoustic waves during the magnetic reconnection between solar coronal loops
Spectroscopic EUV observations of impulsive solar energetic particle event sources
CME-driven shock and Type II solar radio burst band-splitting
Signatures of magnetic reconnection at the footpoints of fan shape jets on a light bridge driven by photospheric convective motions
Drifting of the line-tied footpoints of CME flux-ropes
Three-dimensional Magnetic Reconnection Triggering an X-class Confined Flare in Active Region 12192
Oscillations accompanying a He I 10830 Å negative flare in a solar facula
The Origin of Major Solar Activity - Collisional Shearing Between Nonconjugated Polarities of Multiple Bipoles Emerging Within Active Regions
Probing the Puzzle of Behind-the-limb γ-Ray Flares: Data-driven Simulations of Magnetic Connectivity and CME-driven Shock Evolution
Transition-region explosive events produced by plasmoid instability
Flare Productivity of Major Flaring Solar Active Regions: A Time-series Study of Photospheric Magnetic Properties
Physical processes involved in the EUV "Surge" Event of 09 May 2012
Formation and Eruption of an Active Region Sigmoid. II. Magnetohydrodynamic Simulation of a Multistage Eruption
Evolution of Photospheric Vector Magnetic Field Associated with Moving Flare Ribbons As Seen By GST

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



© 2003 Solar Physics Group - Montana State University