E-Print Archive

There are 3836 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
Subject will be restored when possible View all abstracts by submitter

Wei Liu   Submitted: 2007-09-12 15:56

We present data analysis and interpretation of an M1.4-class flare observed with the Reuven Ramaty High Energy Solar Spectroscopic Imager ({it RHESSI}) on April 30, 2002. This event, with its footpoints occulted by the solar limb, exhibits a rarely observed, but theoretically expected, double-source structure in the corona. The two coronal sources, observed over the 6-30 keV range, appear at different altitudes and show energy-dependent structures with the higher-energy emission being closer together. Spectral analysis implies that the emission at higher energies in the inner region between the two sources is mainly {it nonthermal}, while the emission at lower energies in the outer region is primarily {it thermal}. The two sources are both visible for about 12 minutes and have similar light curves and power-law spectra above about 20 keV. These observations suggest that the magnetic reconnection site lies between the two sources. Bi-directional outflows of the released energy in the form of turbulence and/or particles from the reconnection site can be the source of the observed radiation. The spatially resolved thermal emission below about 15 keV, on the other hand, indicates that the lower source has a larger emission measure but a lower temperature than the upper source. This is likely the result of the differences in the magnetic field and plasma density of the two sources.

Authors: Wei Liu, Vahe' Petrosian, Brian R. Dennis, and Yan Wei Jiang
Projects: RHESSI

Publication Status: Revised version submitted to ApJ, available at ADS or astro-ph/arXiv:0709.1963
Last Modified: 2007-10-31 20:52
Go to main E-Print page  Subject will be restored when possible  Subject will be restored when possible  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
Observationally quantified reconnection providing a viable mechanism for active region coronal heating
Statistical Properties of Ribbon Evolution and Reconnection Electric Fields in Eruptive and Confined Flares
Unambiguous Evidence of Filament Splitting-Induced Partial Eruptions
On the Origin of the Double-cell Meridional Circulation in the Solar Convection Zone
Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
Diffusive transport of energetic electrons in the solar corona: X-ray and radio diagnotics
Plasma evolution within an erupting coronal cavity
Identification of multiple hard X-ray sources in solar flares: A Bayesian analysis of the February 20 2002 event
Flux Rope Breaking and Formation of a Rotating Blowout Jet
On-Orbit Performance of the Helioseismic and Magnetic Imager Instrument onboard the Solar Dynamics Observatory
Two-Phase Heating in Flaring Loops
Evidence For The Magnetic Breakout Model in an Equatorial Coronal-Hole Jet
Spontaneous flux concentrations from the negative effective magnetic pressure instability beneath a radiative stellar surface
Powerful Solar Flares of September 2017: Correspondence Between Parameters of Microwave Bursts and Proton Fluxes near Earth
Evaluation of Applicability of a Flare Trigger Model based on Comparison of Geometric Structures
Coronal hole evolution from multi-viewpoint data as input for a STEREO solar wind speed persistence model
Formation and Dynamics of a Solar Eruptive Flux Tube
The Instruments and Capabilities of the Miniature X-ray Solar Spectrometer (MinXSS) CubeSats
Fine Structures of Solar Radio Type III Bursts and their Possible Relationship with Coronal Density Turbulence
Influence of misalignments on the performance of externally occulted solar coronagraphs. Application to PROBA-3/ASPIICS

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