E-Print Archive

There are 3813 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
Solar filament eruptions and their physical role in triggering Coronal Mass Ejections View all abstracts by submitter

Pascal Demoulin   Submitted: 2012-12-17 07:45

Solar filament eruptions play a crucial role in triggering coronal mass ejections (CMEs). More than 80 % of eruptions lead to a CME. This correlation has been studied extensively during the past solar cycles and the last long solar minimum. The statistics made on events occurring during the rising phase of the new solar cycle 24 is in agreement with this finding. Both filaments and CMEs have been related to twisted magnetic fields. Therefore, nearly all the MHD CME models include a twisted flux tube, called a flux rope. Either the flux rope is present long before the eruption, or it is built up by reconnection of a sheared arcade from the beginning of the eruption. In order to initiate eruptions, different mechanisms have been proposed: new emergence of flux, and/or dispersion of the external magnetic field, and/or reconnection of field lines below or above the flux rope. These mechanisms reduce the downward magnetic tension and favor the rise of the flux rope. Another mechanism is the kink instability when the configuration is twisted too much. In this paper we open a forum of discussions revisiting observational and theoretical papers to understand which mechanisms trigger the eruption. We conclude that all the above quoted mechanisms could bring the flux rope to an unstable state. However, the most efficient mechanism for CMEs is the loss-of-equilibrium or torus instability, when the flux rope has reached an unstable threshold determined by a decay index of the external magnetic field.

Authors: Schmieder B., Demoulin P., Aulanier G.
Projects: None

Publication Status: in press, Advances in Space Research
Last Modified: 2012-12-17 11:09
Go to main E-Print page  The Build-up to Eruptive Solar Events Viewed as the Development of Chiral Systems  Can Superflares Occur on Our Sun ?  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
The density compression ratio of shock fronts associated with coronal mass ejections
Evolution of Photospheric Flow and Magnetic Fields Associated with The 2015 June 22 M6.5 Flare
Spatially inhomogeneous acceleration of electrons in solar flares
Probing Twisted Magnetic Field Using Microwave Observations in an M Class Solar Flare on 11 February, 2014
The origin, early evolution and predictability of solar eruptions
Polar Field Correction for HMI Line-of-Sight Synoptic Data
Relationship between Intensity of White-Light Flares and Proton Flux of Solar Energetic Particles
Spectroscopic Observations of a Current Sheet in a Solar Flare
IRIS Observations of Spicules and Structures Near the Solar Limb
Strong Transverse Photosphere Magnetic Fields and Twist in Light Bridge Dividing Delta Sunspot of Active Region 12673
Simultaneous observation of a flux rope eruption and magnetic reconnection during an X-class solar flare
Spectroscopic diagnostics of the non-Maxwellian κ-distributions using SDO/EVE observations of the 2012 March 7 X-class flare
Transient rotation of photospheric vector magnetic fields associated with a solar flare
Three-dimensional Forward-fit Modeling of the Hard X-Ray and Microwave Emissions of the 2015 June 22 M6.5 Flare
Center-to-Limb Variability of Hot Coronal EUV Emissions During Solar Flares
A time dependent relation between EUV solar flare light-curves from lines with differing formation temperatures
Understanding Breaks in Flare X-Ray Spectra: Evaluation of a Cospatial Collisional Return-current Model
Solar energetic particles and radio burst emission
A quasi-periodic fast-propagating magnetosonic wave associated with the eruption of a magnetic flux rope
Two-step solar filament eruptions

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