Fifth RHESSI Workshop

Ascona, Switzerland

June 7-11, 2005

Group 1: Electron Acceleration and Propagation

Group Leader:
Gordon Holman
NASA's Goddard Space Flight Center
Code 671
Greenbelt, MD 20771
Gordon.D.Holman@nasa.gov

Registered Group Members


Summary

Group 1 focused on deducing electron distributions from photon spectra,
and on closely related topics such as spectral evolution, electron energetics,
and the impact of albedo, a return current, and a hot target plasma
on X-ray spectra. Observations related to electron acceleration models
and the status of X-ray polarization measurements were also discussed.

Group 1 Summary Presentation

Group 1 Summary Presentation
Fourth RHESSI Workshop
Meudon, France, 25-28 July 2004

 

Outline of Topics and Sequence of Discussion

 
  • Spectral inversion and forward-fit methods
    • How do they work?
    • How well do they work?
  • The low-energy "cutoff" of accelerated electron distributions and electron energetics
    • How well can we determine the location and shape?
    • What impact do albedo, a return current, and a hot target have on this?
  • Correlations of flare properties and their implications
  • Time evolution of flare X-ray spectra and implications
  • Electron acceleration models and related observations
  • X-ray polarization
  • Imaging spectroscopy (special Friday evening session)

Group Schedule

Wednesday, 8 June

08:30-10:00 Plenary session
10:00-10:45 Coffee
10:45-12:30 

Working group session:

Update of spectral inversion work

12:30-14:00 Lunch (at the observatory cafeteria )
14:00-15:30

Working group session:

Determination of low-energy "cutoffs" and electron energy flux

15:30-16:00 Coffee
16:00-17:30

Working group session:

Impact of albedo on X-ray spectra

19:00 Reception at the Castle of Locarno

Thursday, 9 June

08:30-10:15

Working group session:

Impact of return current and "hot" target on
X-ray spectra
10:15-10:45 Coffee
10:45-12:15 

Working group session:

Correlation of flare properties, including
spectral index & X-ray flux
Energy-dependent time delays and electron propagation and trapping
12:15-14:00 Lunch (at the observatory cafeteria )
14:00-18:20 Special Topic Group Meetings
16:00 Departure to visit IRSOL Solar Telescope (optional)
18:20 Departure for the Workshop Dinner


Friday, 10 June

08:30-10:15

Working group session:
(with Groups 3 & 5)

Radio evidence for termination shocks
Observational constraints on models

10:15-10:45 Coffee
10:45-12:30 

Working group session:

Evolution of reconnection along flare ribbons
12:30-14:00 Lunch (at the observatory cafeteria )
14:00-15:30

Working group session:

X-ray polarization
Discussion of cataloging observational constraints on electron acceleration models
15:30-16:00 Coffee
16:00-17:30

Working group session:

Free
Imaging Spectroscopy Session at 17:45

 

Fifth RHESSI Workshop
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