E-Print Archive

There are 3637 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
The relationship between hard X-ray pulse timings and the locations of footpoint sources during solar flares View all abstracts by submitter

Andrew Inglis   Submitted: 2012-01-27 10:56

The cause of quasi-periodic pulsations (QPP) in solar flares remainsthe subject of debate.Recently, Nakariakov & Zimovets (2011) proposed a new model suggestingthat, in two-ribbonflares, such pulsations could be explained by propagating slow waves.These waves may travelobliquely to the magnetic field, reflect in the chromosphere andconstructively interfere at aspatially separate site in the corona, leading to quasi-periodicreconnection events progressingalong the flaring arcade. Such a slow wave regime would have certainobservational characteristics.We search for evidence of this phenomenon during a selection oftwo-ribbon flares observed byRHESSI, SOHO and TRACE; the flares of 2002 November 9, 2005 January 19and 2005 August22. We were not able to observe a clear correlation between hard X-rayfootpoint separationsand pulse timings during these events. Also, the motion of hard X-rayfootpoints is shown to becontinuous within the observational error, whereas a discontinuousmotion might be anticipatedin the slow wave model. Finally, we find that for a preferential slowwave propagation angle of25-28 degrees that is expected for the fastest waves, the velocitiesof the hard X-ray footpointslead to estimated pulse periods and ribbon lengths significantlylarger than the measured values.Hence, for the three events studied, we conclude that theobservational characteristics cannot beeasily explained via the Nakariakov & Zimovets (2011) propagating slowwave model when onlyangles of 25-28 degrees are considered. We provide suggested flareparameters to optimise futurestudies of this kind.

Authors: A. R. Inglis & B. R. Dennis
Projects: RHESSI,SoHO-EIT,TRACE

Publication Status: ApJ (accepted)
Last Modified: 2012-01-27 22:34
Go to main E-Print page  Prominence seismology  Observations of Enhanced EUV Continua During An X-class Solar Flare Using SDO/EVE  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
Coronal loop density profile estimated by forward modelling of EUV intensity
The magnetic connectivity of coronal shocks to the visible solar surface during long-duration gamma-ray events
Dissipative instability in a partially ionised prominence slab
Significance testing for quasi-periodic pulsations in solar and stellar flares
High Resolution Observations of a White Light Flare with NST
Flare forecasting at the Met Office Space Weather Operations Centre
On the Effectiveness of Multi-Instrument Solar Flare Observations During Solar Cycle 24
The Grad-Shafranov Reconstruction of Toroidal Magnetic Flux Ropes: Method Development and Benchmark Studies
Long-Period Intensity Pulsations in Coronal Loops Explained by Thermal Non-Equilibrium Cycles
Differences between Doppler velocities of ions and neutral atoms in a solar prominence
Interaction of Two Active Region Filaments Observed by NVST and SDO
On flare-CME characteristics from Sun to Earth combining remote-sensing image data with in-situ measurements supported by modeling
High-frequency transverse oscillations and intensity perturbations in spicular-type events
Sheath-Accumulating Propagation of Interplanetary Coronal Mass Ejection
Investigating the Wave Nature of the Outer Envelope of Halo Coronal Mass Ejections
Apparent and Intrinsic Evolution of Active Region Upflows
An Early Diagnostics of the Geoeffectiveness of Solar Eruptions from Photospheric Magnetic Flux Observations: The Transition from SOHO to SDO
Plasma Brightenings in a Failed Solar Filament Eruption
Interactive Multi-Instrument Database of Solar Flares
Moreton and EUV Waves Associated with an X1.0 Flare and CME Ejection

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