E-Print Archive

There are 3672 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
X-ray sources and magnetic reconnection in the X3.9 flare of 2003 November 3 View all abstracts by submitter

Astrid Veronig   Submitted: 2005-09-30 06:16

Recent RHESSI observations indicate an apparent altitude decrease of flare X-ray loop-top (LT) sources before changing to the commonly observed upward growth of the flare loop system. We performed a detailed study of the LT altitude decrease for one well observed flare in order to find further hints on the physics of this phenomenon and how it is related to the magnetic reconnection process in solar flares. RHESSI X-ray source motions in the 2003 November 3, X3.9 flare are studied together with complementary data from SXI, EIT, and Kanzelhohe H α . We particularly concentrate on the apparent altitude decrease of the RHESSI X-ray LT source early in the flare and combine kinematical and X-ray spectral analysis. Furthermore, we present simulations from a magnetic collapsing trap model embedded in a standard 2-D magnetic reconnection model of solar flares. We find that at higher photon energies the LT source is located at higher altitudes and shows higher downward velocities than at lower energies. The mean downward velocities range from 14 km s-1 in the RHESSI 10-15~keV energy band to 45 km s-1 in the 25-30 keV band. For this flare, the LT altitude decrease was also observed by the SXI instrument with a mean speed of 12 km s-1. RHESSI spectra indicate that during the time of LT altitude decrease the emission of the LT source is thermal bremsstrahlung from a ``superhot'' plasma with temperatures increasing from 35 MK to 45 MK and densities of the order of 1010 cm-3. The temperature does not significantly increase after this early (pre-impulsive superhot LT) phase, whereas the LT densities increase to a peak value of (3-4)cdot 1011 cm-3.} Modeling of a collapsing magnetic trap embedded in a standard 2D magnetic reconnection model can reproduce the key observational findings in case that the observed emission is thermal bremsstrahlung from the hot LT plasma. This is in accordance with the evaluated RHESSI spectra for this flare.

Authors: A.M. Veronig, M. Karlický, B. Vrsnak, M. Temmer, J. Magdalenic, B.R. Dennis, W. Otruba, W. Poetzi
Projects: RHESSI

Publication Status: A&A (accepted)
Last Modified: 2005-09-30 06:16
Go to main E-Print page  Multiwavelength Analysis of a Solar Flare on 2002 April 15  Multi-wavelength study of coronal waves associated with the CME-flare event of 03 November 2003  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
Origin and Structures of Solar Eruptions I: Magnetic Flux Rope (Invited Review)
JHelioviewer - Time-dependent 3D visualisation of solar and heliospheric data
Acceleration and Propagation of Solar Energetic Particles
The First ALMA Observation of a Solar Plasmoid Ejection from an X-ray Bright Point
Observing the Sun with Atacama Large Millimeter/submillimeter Array (ALMA): High Resolution Interferometric Imaging
Exoplanet Predictions Based on Harmonic Orbit Resonances
On a role of quadruple component of magnetic field in defining solar activity in grand cycles
CME dynamics using STEREO & LASCO observations: the relative importance of Lorentz forces and solar wind drag
Impulsive plasma outflows due to wave driven magnetic reconnection
Propagation of Torsional Alfvén Waves from the Photosphere to the Corona: Reflection, Transmission, and Heating in Expanding Flux Tubes
Plasma parameters and geometry of cool and warm active region loops
Explosive chromospheric evaporation driven by nonthermal electrons around one footpoint of a solar flare loop
Nonlinear evolution of short-wavelength torsional Alfvén waves ?
Siberian Radioheliograph: First Results
Two Step Filament Eruption During 14-15 March 2015
Magnetic nulls and super-radial expansion in the solar corona
Evidence for two-loop interaction from IRIS and SDO observations of penumbral brightenings
Coronal cavities: observations and implications for the magnetic environment of prominences
A parameter study for modeling MgII h and k emission during solar flares
Relationships Between Characteristics of the Line-of-Sight Magnetic Field and Solar Flare Forecasts

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