E-Print Archive

There are 4353 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
Comparison of Five Numerical Codes for Automated Tracing of Coronal Loops View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2007-05-21 13:11

The 3D modeling of coronal loops and filaments requires algorithms that automatically trace curvi-linear features in solar EUV or soft X-ray images. We compare 5 existing algorithms that have been developed and customized to trace curvi-linear features in solar images: (1) oriented-connectivity method (OCM), which is an extension of the Strous pixel labeling algorithm (developed by Lee, Newman, and Gary); (2) dynamic aperture-based loop segmentation method (developed by Lee, Newman, and Gary); (3) unbiased detection of curvi-linear structures (developed by Steger, Raghupathy, and Smith); (4) oriented-direction method (developed by Aschwanden); and (5) ridge detection by automated scaling method (developed by Inhester). We test the 5 existing numerical codes with a TRACE image that shows a bipolar active region and contains over 100 discernable loops. We evaluate the performance of the 5 codes by comparing the cumulative distribution of loop lengths, the median and maximum loop length, the completeness or detection efficiency, the accuracy, and flux sensitivy. These algorithms are useful for the reconstruction of the 3D geometry of coronal loops from stereoscopic observations with the STEREO spacecraft, or for quantitative comparisons of observed EUV loop geometries with (nonlinear force-free) magnetic field extrapolation models.

Authors: Markus Aschwanden, Jong Kwan Lee, G. Allen Gary, Mike Smith, & Bernd Inhester
Projects: TRACE

Publication Status: submitted to Solar Physics for Topical Issue on Challenges in Solar Image Analysis and Visualization, presented at 3rd Solar Image Processing Workshop in Dublin, Ireland, 6-8 Sept 2006
Last Modified: 2007-05-22 08:55
Go to main E-Print page  The Magnetic Connection Between the Convection Zone and Corona in the Quiet Sun  Asteroseismic Signatures of Small Convective Cores  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 role of non-axisymmetry of magnetic flux rope in constraining solar eruptions
Energy budget of plasma motions, heating, and electron acceleration in a three-loop solar flare
Space weather: the solar perspective - an update to Schwenn (2006)
Mixed properties of slow magnetoacoustic and entropy waves in a plasma with heating/cooling misbalance
The morphology of average solar flare time profiles from observations of the Sun's lower atmosphere
Indications of stellar coronal mass ejections through coronal dimmings
Could switchbacks originate in the lower solar atmosphere? II. Propagation of switchbacks in the solar corona
Solar large-scale magnetic field and cycle patterns in solar dynamo
Three-dimensional magnetic reconnection in astrophysical plasmas
Energy partition in a confined flare with an extreme-ultraviolet late phase
Alfvén wave heating in partially ionized thin threads of solar prominences
He I 10830 Dimming During Solar Flares, I: The Crucial Role of Non-Thermal Collisional Ionisations
Separating aa-index into Solar and Hale Cycle Related Components Using Principal Component Analysis
Inward Propagating Plasma Parcels in the Solar Corona: Models with Aerodynamic Drag, Ablation, and Snowplow Accretion
Energetics and 3-D Structure of Elementary Events in Solar Coronal Heating
Stellar Superflares Observed Simultaneously with Kepler and XMM-Newton
Medium-term predictions of F10.7 and F30 cm solar radio flux with the adaptive Kalman filter
Resonances in a Coronal Loop Driven by Torsional Alfvén Waves Propagating from the Photosphere
Effects of external flow on resonant absorption of coronal loop kink oscillations driven by an external fast wave: Selective excitation problem
Emerging Dimming as Coronal Heating Episodes

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