E-Print Archive

There are 4506 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
The emergence of a twisted magnetic flux tube into a preexisting coronal arcade View all abstracts by submitter

Sarah Gibson   Submitted: 2003-11-11 09:53

To investigate the dynamic evolution of coronal magnetic field in response to the emergence of significantly twisted magnetic structures, we perform MHD simulations in the low-beta regime of the emergence of a twisted magnetic flux tube into a pre-existing coronal potential magnetic arcade. Our simulation of a twisted flux tube, which when fully emerged, contains a twist of 1.875 imes 2 pi field-line rotation about the axis between the anchored footpoints, leads to a magnetic structure with substantial writhing of the tube axis (apex rotation > 90 degrees) as a result of the non-linear evolution of the kink instability. For an emerging tube with a left-handed twist (which is the preferred sense of twist for active regions in the northern hemisphere), the writhing of the tube is also left-handed, producing a forward S-shape for the tube axis as viewed from the top, which is opposite to the inverse S-shaped X-ray sigmoid structures preferentially seen in the northern hemisphere. However we find that the writhing motion of the tube and its interaction with the ambient coronal magnetic field also drives the formation of an intense current layer which displays an inverse S-shape, consistent with the shape of X-ray sigmoids.

Authors: Y. Fan and S. Gibson

Publication Status: ApJ, 589, L105, 2003
Last Modified: 2003-11-14 09:40
Go to main E-Print page  Helicity of magnetic clouds and their associated active regions  Rapid Penumbral Decay Following Three X-Class Flares  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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
Do periods of decayless kink oscillations of solar coronal loops depend on noise?
Automatic detection technique for solar filament oscillations in GONG data
Probing the Density Fine Structuring of the Solar Corona with Comet Lovejoy
Confined plasma transition from the solar atmosphere to the interplanetary medium
Extracting the Heliographic Coordinates of Coronal Rays using Images from WISPR/Parker Solar Probe
Two-spacecraft detection of short-period decayless kink oscillations of solar coronal loops
Genesis and Coronal-jet-generating Eruption of a Solar Minifilament Captured by IRIS Slit-raster Spectra
First detection of transverse vertical oscillation during the expansion of coronal loops
A New Position Calibration Method for MUSER Images
Sigmoid Formation Through Slippage of A Single J-shaped Coronal Loop
MHD Simulation of Homologous Eruptions from Solar Active Region 10930 Caused by Sunspot Rotation
Dropouts of Fully Stripped Ions in the Solar Wind: A Diagnostic for Wave Heating versus Reconnection
Plasma heating and nanoflare caused by slow-mode wave in a coronal loop
The Lyman-α Emission in a C1.4 Solar Flare Observed by the Extreme Ultraviolet Imager aboard Solar Orbiter
Imaging and Spectroscopic Observations of the Dynamic Processes in Limb Solar Flares
Evolution of the critical torus instability height and CME likelihood in solar active regions
A Magnetogram-matching Method for Energizing Magnetic Flux Ropes Toward Eruption
A 2D Model for Coronal Bright Points: Association with Spicules, UV bursts, Surges and EUV Coronal Jets
The relativistic solar particle event on 28 October 2021: Evidence of particle acceleration within and escape from the solar corona
Statistical Analysis of Stellar Flares from the First Three Years of TESS Observations

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