E-Print Archive

There are 4089 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
The evolution of barbs on a polar crown filament observed by SDO View all abstracts by submitter

Leping Li   Submitted: 2012-05-07 01:21

From August 16 to 21, 2010, a northern (~ N60) polar crown filament was observed by Solar Dynamics Observatory (SDO). Employing the six day SDO/AIA data, we identify 69 barbs, and select 58 of them, which appeared away from the western solar limb (≤ W60), as our sample. We systematically investigate the evolution of filament barbs. Three different types of apparent formation of barbs are detected, including (1) the convergence of surrounding moving plasma condensations, comprised 55.2% of our sample, (2) the flows of plasma condensations from the filament, composed 37.9%, and (3) the plasma injections from the neighboring brightening regions, comprised 6.9%. We also find three different ways of barb disappearance, involving: (i) the bi-lateral movements (44.8%), and (ii) the outflowing (27.6%), of barb plasma results in the barb disappearance, as well as (iii) the barb disappearance is associated with the neighboring brightening (27.6%). The evolutions of the magnetic fields, e.g. magnetic emergences, and magnetic cancelations and disappearances, may cause the formation and disappearance of the barb magnetic structures. Barbs exchange plasma condensations with the surrounding atmosphere, filament, and nearby brightening regions, leading to the formation and disappearance of barb material. Furthermore, we find that all the barbs underwent oscillations. The average oscillating period, amplitude and velocity are 30 min, 2.4 Mm and 5.7 km s-1, respectively. Besides the oscillations, 21 (36%) barbs manifested sideward motions having an average speed of 0.45 km s-1. Small-scale wave-like propagating disturbances caused by small-scale brightening are detected, and the barb oscillations associated with the disturbances are also found. We propose that the kinematics of barbs may be caused by the evolution of the neighboring photospheric magnetic fields.

Authors: Leping Li and Jun Zhang
Projects: SDO-AIA

Publication Status: Accepted by Sol. Phys., 39 pages, 16 figures
Last Modified: 2012-05-07 13:36
Go to main E-Print page  Surface Alfven waves in solar flux tubes  Properties of Ground Level Enhancement Events and the Associated Solar Eruptions during Solar Cycle 23  Edit Entry  Download Preprint  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
Fundamental Transverse Vibrations of the Active Region Solar Corona
Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
Magnetic helicity and eruptivity in active region 12673
Impulsive coronal heating from large-scale magnetic rearrangements: from IRIS to SDO/AIA
Probing the effect of cadence on the estimates of photospheric energy and helicity injections in eruptive active region NOAA AR 11158
The birth of a coronal mass ejection
Oscillations of the baseline of solar magnetic field and solar irradiance on a millennial timescale
Chromospheric cannonballs on the Sun
Magnetic Helicity from Multipolar Regions on the Solar Surface
Exoplanet predictions based on harmonic orbit resonances
The width distribution of solar coronal loops and strands - Are we hitting rock bottom ?
Order out of randomness: Self-organization processes in astrophysics
Convection-driven generation of ubiquitous coronal waves
The minimum energy principle applied to Parker's coronal braiding and nanoflaring scenario
Self-organizing systems in planetary physics: Harmonic resonances of planet and moon orbits
Global energetics of solar flares: VIII. The Low-Energy Cutoff
Global energetics of solar flares: VIII. The Low-Energy Cutoff
Global Energetics of Solar Flares: VII. Aerodynamic Drag in Coronal Mass Ejections
Self-organized criticality in solar and stellar flares: Are extreme events scale-free ?
A Wavelet Based Approach to Solar-Terrestrial Coupling

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