E-Print Archive

There are 1713 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 bursty nature of solar flare X-ray emission View all abstracts by submitter

R.T.James McAteer   Submitted: 2007-05-23 13:47

The complex and highly-varying temporal nature of emission from an X4.8 flare is studied across 7 X-ray energy bands. A wavelet transform modulus maxima method is used to obtain the multifractal spectra of the temporal variation of the X-ray emission. As expected from the Neupert effect, the time series of emission at low (3--6, 6--12~keV; thermal) energies is smooth. The peak Holder exponent around 1.2 for this low energy emission is indicative of a signal with a high degree of memory and suggestive of a smooth chromospheric evaporation process. The more bursty emission at higher energies (100--300, 300--800~keV; non-thermal) is described by a multifractal spectrum which peaks at a smaller Holder exponent (less than 0.5 for the largest singularities), indicative of a signal with a low degree of memory. This describes an anti-persistent walk and indicates a impulsive, incoherent driving source. We suggest this may arise from bursty reconnection, with each reconnection event producing differing and uncorrelated non-thermal particle sources. The existence of power law scaling of wavelet coefficients across timescales is in agreement with the creation of a fractal current sheet diffusion region.

Authors: R.T.James McAteer, C.Alex Young, Jack Ireland, Peter T. Gallagher
Projects: RHESSI

Publication Status: ApJ, 662, 691, 2007
Last Modified: 2007-06-11 07:58
Go to main E-Print page  Grand minima and maxima of solar activity: New observational constraints  Absolute and convective instabilities in an inviscid compressible mixing
  layer  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
Statistical properties of H -alpha flares in relation to sunspots and active regions in the cycle 23
Diagnostics of energetic electrons with anisotropic distributions in solar flares I. Hard X-rays bremsstrahlung emission
On the Correlation between Spectra of Solar Microwave Bursts and Proton Fluxes near the Earth
Sun-as-a-Star, Chromospheric Lines, 1974-2009
FORMATION OF TORUS-UNSTABLE FLUX ROPES AND ELECTRIC CURRENTS IN ERUPTING SIGMOIDS
Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition: Application to Discrete Data
Minima of Solar Cycles 22/23 and 23/24 as Seen in SOHO/CELIAS/SEM Absolute Solar EUV Flux
HINODE OBSERVATIONS OF COHERENT LATERAL MOTION OF PENUMBRAL FILAMENTS DURING A X-CLASS FLARE
EUV SpectroPhotometer (ESP) in Extreme Ultraviolet Variability Experiment
The effect of wave-particle interactions on low energy cutoffs in solar flare electron spectra
Heliospheric Current Sheet Distortions from Adjacent Outflowing Transients: Multi-spacecraft Observations
A detailed investigation of the properties of a Vlasov-Maxwell equilibrium for the force-free Harris sheet}
On the Relationship between Equilibrium Bifurcations and Ideal MHD Instabilities for Line-Tied Coronal Loops}
Coronal Mass Ejections and Global Coronal Magnetic Field Reconfiguration
Relationship Between a Coronal Mass Ejection-Driven Shock and a Coronal Metric Type II Burst
An Intriguing Chromospheric Jet Observed by Hinode: I. Fine Structure Kinematics and Evidence of Unwinding Twists
A Code for Automated Tracing of Coronal Loops Approaching Visual Perception
Large Amplitude Oscillations in Prominences
An Extension of the Theory of Kinematic MHD Models of Collapsing Magnetic Traps to 2.5D with shear flow and to 3D
Confirming a Seismologically Inferred Coronal Temperature

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