E-Print Archive

There are 4414 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
Bayesian Analysis of Quasi-periodic Pulsations in Stellar Flares View all abstracts by submitter

David James Pascoe   Submitted: 2020-11-02 17:06

Quasi-periodic pulsations (QPPs) are routinely observed in a range of wavelengths during flares but in most cases the mechanism responsible is unknown. We present a method to detect and characterise QPPs in time series such as light curves for solar or stellar flares based on forward modelling and Bayesian analysis. We include models for QPPs as oscillations with finite lifetimes and non-monotonic amplitude modulation, such as wave trains formed by dispersive evolution in structured plasmas. By quantitatively comparing different models using Bayes factors we characterise the QPPs according to five properties; sinusoidal or non-sinusoidal, finite or indefinite duration, symmetric or asymmetric perturbations, monotonic or non-monotonic amplitude modulation, and constant or varying period of oscillation. We demonstrate our method and show examples of these five characteristics by analysing QPPs in white light stellar flares observed by the Kepler space telescope. Different combinations of properties may be able to identify particular physical mechanisms and so improve our understanding of QPPs and allow their use as seismological diagnostics. We propose three observational classes of QPPs can be distinguished; decaying harmonic oscillations, finite wave trains, and non-sinusoidal pulsations.

Authors: D. J. Pascoe, A. Smyrli, T. Van Doorsselaere, and A.-M. Broomhall
Projects: Other

Publication Status: ApJ (accepted)
Last Modified: 2020-11-04 13:08
Go to main E-Print page  Time and Charge-Sign Dependence of the Heliospheric Modulation of Cosmic Rays  Cause and Kinematics of a Jetlike CME  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
Formation of Magnetic Flux Rope during Solar Eruption. I. Evolution of Toroidal Flux and Reconnection Flux
Stereoscopy of extreme UV quiet Sun brightenings observed by Solar Orbiter/EUI
Solar Flare Effects on the Earth’s Lower Ionosphere
Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region
Probing Current Sheet Instabilities from Flare Ribbon Dynamics
Global Nature of Solar Coronal Shock Waves shown by Inconsistency between EUV Waves and Type II Radio Bursts
Solar surges related to UV bursts: Characterization through k-means, inversions and density diagnostics
A revised cone model and its application to non-radial prominence eruptions
Zonal harmonics of solar magnetic field for solar cycle forecast
TESS observations of flares and quasi-periodic pulsations from low mass stars and potential impact on exoplanets
Kink oscillations of coronal loops
First Frequency-Time-Resolved Imaging Spectroscopy Observations of Solar Radio Spikes
Magnetic Flux and Magnetic Non-potentiality of Active Regions in Eruptive and Confined Solar Flares
Observations of shock propagation through turbulent plasma in the solar corona
The Formation and Lifetime of Outflows in a Solar Active Region
Localised acceleration of energetic particles by a weak shock in the solar corona
Stereoscopic Measurements of Coronal Doppler Velocities
Multi-wavelength Observations of a Metric Type-II Event
A physics-based method that can predict imminent large solar flares
The Solar Memory From Hours to Decades

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