E-Print Archive

There are 3056 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. Karlicky, 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
PREDICTION OF SOLAR ACTIVITY FROM SOLAR BACKGROUND MAGNETIC FIELD VARIATIONS IN CYCLES 21?23
Trigger Mechanism of Solar Subflares in a Braided Coronal Magnetic Structure
The Magnetic Field in the Solar Atmosphere
Energy propagation by transverse waves in multiple flux tube systems using filling factors
Coronal Fourier power spectra: implications for coronal seismology and coronal heating
Relationship between the Magnetic Flux of Solar Eruptions and the Ap Index of Geomagnetic Storms
Early Evolution of an Energetic Coronal Mass Ejection and Its Relation to EUV Waves
The Formation of Kappa-Distribution Accelerated Electron Populations in Solar Flares
Superflare occurrence and energies on G-, K- and M-type dwarfs
Comment on ``Detection and characterization of 0.5--8 MeV neutrons near Mercury: Evidence for a solar origin"
How Can Active Region Plasma Escape into the Solar Wind from below a Closed Helmet Streamer?
On the Area Expansion of Magnetic Flux-Tubes in Solar Active Regions
NEW INSIGHTS INTO THE PHYSICAL NATURE OF CORONAL MASS EJECTIONS AND ASSOCIATED SHOCK WAVES WITHIN THE FRAMEWORK OF THE THREE-DIMENSIONAL STRUCTURE
Three-dimensional Magnetic Restructuring in Two Homologous Solar Flares in the Seismically Active NOAA AR 11283
Signatures of the non-Maxwellian kappa-distributions in optically thin line spectra I. Theory and synthetic Fe IX--XIII spectra
The Relation Between Large-Scale Coronal Propagating Fronts and Type II Radio Bursts
The Relation Between Large-Scale Coronal Propagating Fronts and Type II Radio Bursts
A simple model of chromospheric evaporation and condensation driven conductively in a solar flare
Conversion from mutual helicity to self-helicity observed with IRIS
Understanding CME and associated shock in the solar corona by merging multi wavelengths observation

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