E-Print Archive

There are 4507 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
Nonuniform Target Ionisation and Fitting Thick Target Electron Injection Spectra to RHESSI Data View all abstracts by submitter

Eduard Kontar   Submitted: 2003-03-26 15:02

Past analysis of flare Hard X-Ray (HXR) spectra have largely ignored the effect of nonuniform ionisation along the electron paths in the thick target model, though it is very significant for well-resolved spectra. The inverse problem (photon spectrum to electron injection spectrum {cal F}_0(E_0)) is disturbingly non-unique. However, we show that it is relatively simple to allow for the effect in forward fitting of parametric models of {cal F}_0(E_0) and provide an expression to evaluate it for the usual single power law form of {cal F}_0(E_0). The expression involves the column depth N_* of the transition region in the flare loop as one of the parameters so data fitting can enable derivation of N_* (and its evaporative evolution) as part of the fitting procedure. The fit to RHESSI data on four flares for a single power law {cal F}_0(E_0) is much improved when ionisation structure is included compared to when the usual fully ionised approximation is used. This removes the need, in these events at least, to invoke broken power-laws, or other forms, of the acceleration spectrum {cal F}_0(E_0) to explain the observed photon spectrum.

Authors: E.P. Kontar, J.C. Brown, and G. K. McArthur
Projects: RHESSI

Publication Status: Solar Physics, (in press)
Last Modified: 2005-12-07 05:18
Go to main E-Print page  Nonuniform Target Ionisation and Fitting Thick Target Electron Injection Spectra to RHESSI Data  Nonuniform Target Ionisation and Fitting Thick Target Electron Injection Spectra to RHESSI Data  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 and contribution of magnetic fields, characterized via their magnetic flux, to the statistical structuring of the solar atmosphere
Do periods of decayless kink oscillations of solar coronal loops depend on noise?
Automatic detection technique for solar filament oscillations in GONG data
Probing the Density Fine Structuring of the Solar Corona with Comet Lovejoy
Confined plasma transition from the solar atmosphere to the interplanetary medium
Extracting the Heliographic Coordinates of Coronal Rays using Images from WISPR/Parker Solar Probe
Two-spacecraft detection of short-period decayless kink oscillations of solar coronal loops
Genesis and Coronal-jet-generating Eruption of a Solar Minifilament Captured by IRIS Slit-raster Spectra
First detection of transverse vertical oscillation during the expansion of coronal loops
A New Position Calibration Method for MUSER Images
Sigmoid Formation Through Slippage of A Single J-shaped Coronal Loop
MHD Simulation of Homologous Eruptions from Solar Active Region 10930 Caused by Sunspot Rotation
Dropouts of Fully Stripped Ions in the Solar Wind: A Diagnostic for Wave Heating versus Reconnection
Plasma heating and nanoflare caused by slow-mode wave in a coronal loop
The Lyman-α Emission in a C1.4 Solar Flare Observed by the Extreme Ultraviolet Imager aboard Solar Orbiter
Imaging and Spectroscopic Observations of the Dynamic Processes in Limb Solar Flares
Evolution of the critical torus instability height and CME likelihood in solar active regions
A Magnetogram-matching Method for Energizing Magnetic Flux Ropes Toward Eruption
A 2D Model for Coronal Bright Points: Association with Spicules, UV bursts, Surges and EUV Coronal Jets
The relativistic solar particle event on 28 October 2021: Evidence of particle acceleration within and escape from the solar corona

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