E-Print Archive

There are 3423 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
Spectroscopic Diagnostics of Solar Magnetic Flux Ropes Using Iron Forbidden Line
Transverse oscillations and stability of prominences in a magnetic field dip
Comparing SSN Index to X-ray Flare and Coronal Mass Ejection Rates from Solar Cycles 22-24
Quasi-periodic processes in the flare loop generated by sudden temperature enhancements at loop footpoints
The apparent critical decay index at the onset of solar prominence eruptions
Temporal Offsets between Maximum CME Speed Index and Solar, Geomagnetic, and Interplanetary Indicators during Solar Cycle 23 and the Ascending Phase of Cycle 24
Constraints on energy release in solar flares from RHESSI and GOES X-ray observations. II. Energetics and energy partition
Constraints on energy release in solar flares from RHESSI and GOES X-ray observations I. Physical parameters and scalings
Modelling of Nonthermal Microwave Emission From Twisted Magnetic Loops
Unprecedented Fine Structure of a Solar Flare Revealed by the 1.6 m New Solar Telescope
The Nature of CME-Flare Associated Coronal Dimming
Long Duration Flare Emission: Impulsive Heating or Gradual Heating?
Lifecycle of a large-scale polar coronal pseudostreamer/cavity system
Amended results for hard X-ray emission by non-thermal thick target recombination in solar flares
The instability and non-existence of multi-stranded loops, when driven by transverse waves
On the origin of 140 GHz emission from the 4 July 2012 solar flare
Light walls around sunspots observed by the Interface Region Imaging Spectrograph
Stereoscopic Observation of Slipping Reconnection in A Double Candle-Flame-Shaped Solar Flare
A Tiny Eruptive Filament as a Flux-Rope Progenitor and Driver of a Large-Scale CME and Wave
Active Latitude Oscillations Observed on the Sun

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