E-Print Archive

There are 3775 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
A statistical study of the inferred transverse density profile of coronal loop threads observed with SDO/AIA View all abstracts by submitter

Christopher Goddard   Submitted: 2017-08-24 03:16

Aims. We carry out a statistical study of the inferred coronal loop cross-sectional density profiles using extreme ultraviolet (EUV) imaging data from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). Methods. We analysed 233 coronal loops observed during 2015/2016. We consider three models for the density profile; the step function (model S ), the linear transition region profile (model L), and a Gaussian profile (model G). Bayesian inference is used to compare the three corresponding forward modelled intensity profiles for each loop. These are constructed by integrating the square of the density from a cylindrical loop cross section along the line of sight, assuming an isothermal cross section, and applying the instrumental point spread function. Results. Calculating the Bayes factors for comparisons between the models, it was found that in 47 % of cases there is very strong evidence for model L over model S and in 45 % of cases very strong evidence for model G over S . Using multiple permutations of the Bayes factor the favoured density profile for each loop was determined for multiple evidence thresholds. There were a similar number of cases where model L or G are favoured, showing evidence for inhomogeneous layers and constantly varying density cross sections, subject to our assumptions and simplifications. Conclusions. For sufficiently well resolved loop threads with no visible substructure it has been shown that using Bayesian inference and the observed intensity profile we can distinguish between the proposed density profiles at a given AIA wavelength and spatial resolution. We have found very strong evidence for inhomogeneous layers, with model L being the most general, and a tendency towards thicker or even continuous layers.

Authors: C. R. Goddard , D. J. Pascoe , S. Anfinogentov, and V. M. Nakariakov
Projects: None

Publication Status: In press
Last Modified: 2017-08-25 10:16
Go to main E-Print page  Solar Open Flux Migration from Pole to Pole: Magnetic Field Reversal  Seismology of contracting and expanding coronal loops using damping of kink oscillations by mode coupling  Edit Entry  Download Preprint  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
A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves
Imaging Spectroscopy of Solar Radio Burst Fine Structures
On a small-scale EUV wave: the driving mechanism and the associated oscillating filament
Type III Solar Radio Burst Source Region Splitting Due to a Quasi-Separatrix Layer
On a solar blowout jet: driven mechanism and the formation of cool and hot components
Understanding the Role of Mass-Unloading in Filament Eruptions
Surges and Si IV bursts in the solar atmosphere. Understanding IRIS and SST observations through RMHD experiments
The direct relation between the duration of magnetic reconnection and the evolution of GOES light curves in solar flares
Large-Amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis
Statistical Study of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars
Effect of local thermal equilibrium misbalance on long-wavelength slow magnetoacoustic waves
Characteristics of Sustained >100 γ-ray Emission Associated with Solar Flares
Characteristics that Produce White-Light Enhancements in Solar Flares Observed by Hinode/SOT
Solar Energetic Particle Forecasting Algorithms and Associated False Alarms
Magnetic swirls and associated fast magnetoacoustic kink waves in a solar chromospheric flux tube
High-wavenumber solar f-mode strengthening prior to active region formation
Block-induced complex structures building the flare-productive solar active region 12673
Reconstruction of a Large-scale Pre-flare Coronal Current Sheet Associated with an Homologous X-shaped Flare
Comparison of Two Coronal Magnetic Field Models for Reconstructing a Sigmoidal Solar Active Region With Coronal Loops
A Magnetic Bald-Patch Flare in Solar Active Region 11117

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