E-Print Archive

There are 4003 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
Magnetic Helicity in Emerging Solar Active Regions View all abstracts by submitter

Yang Liu   Submitted: 2014-02-21 15:41

Using vector magnetic field data from the Helioseismic and MagneticImager (HMI) instrument aboard the Solar Dynamics Observatory (SDO),we study magnetic helicity injection into the corona in emergingactive regions and examine the hemispheric helicity rule. In everyregion studied, photospheric shearing motion contributes most of thehelicity accumulated in the corona. In a sample of 28 emerging activeregions, 17 active regions follow the hemisphere rule (61% ± 18% at a95% confidence interval). Magnetic helicity and twist in 25 activeregions (89% ± 11%) have the same sign. The maximum magnetic twist,which depends on the size of an active region, is inferred in a sampleof 23 emerging active regions with a bipolar magnetic fieldconfiguration.Coronal holes are regions on the Sun's surface that mapthe footprints of open magnetic field lines. We have developed anautomated routine to detect and track boundaries of long-lived coronalholes using full-disk extreme-ultraviolet (EUV) images obtained bySOHO

Authors: Y. Liu, J. T. Hoeksema, M. Bobra, K. Hayashi, P. W. Schuck, X. Sun
Projects: SDO-HMI

Publication Status: ApJ., accepted.
Last Modified: 2014-02-24 13:04
Go to main E-Print page  A model for the formation of the active region corona driven by magnetic flux emergence  The Magnetic Field of Active Region 11158 During the 2011 February 12-17 Flares :                 Differences between Photospheric Extrapolation and Coronal Forward-Fitting Methods  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
Transient Inverse-FIP Plasma Composition Evolution within a Confined Solar Flare
The Role of a Tiny Brightening in a Huge Geo-effective Solar Eruption Leading to the St Patrick's Day Storm
A basal contribution from p-modes to the Alfvénic wave flux in the corona
Multiwavelength Study of Equatorial Coronal-Hole Jets
Non-thermal hydrogen Lyman line and continuum emission in solar flares generated by electron beams
Determining normal mode features from numerical simulations using CEOF analysis: I. Test case using transverse oscillations of a magnetic slab
Modelling the Effect of Mass-Draining on Prominence Eruptions
Transverse waves in coronal flux tubes with thick boundaries: The effect of longitudinal flows
Electron distribution and energy release in magnetic reconnection outflow regions during the pre-impulsive phase of a solar flare
Benchmarking CME arrival time and impact: Progress on metadata, metrics, and events
First Unambiguous Imaging of Large-Scale Quasi-Periodic Extreme-Ultraviolet Wave or Shock
Coronal Imaging with the Solar UltraViolet Imager
Investigation of pre-flare dynamics using the weighted horizontal magnetic gradient method: From small to major flare classes
Seismological determination of the Alfvén speed and plasma-beta in solar photospheric bright points
Dynamo Wave Patterns Inside the Sun Revealed by Torsional Oscillations
Evidence of Twisting and Mixed-polarity Solar Photospheric Magnetic Field in Large Penumbral Jets: IRIS and Hinode Observations
Dissipation scale lengths of density turbulence in the inner solar wind
On the Possibility of Generating Harmonics of the Electron Plasma Frequency in the Solar Atmosphere due to Explosive Instability in a System of Interpenetrating Electron and Ion Flows
Determination of the total accelerated electron rate and power using solar flare hard X-ray spectra
Transition from axi- to nonaxisymmetric dynamo modes in spherical convection models of solar-like stars

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