Author Archive for


WG2: Polarization, Directivity, & Albedo

Group Leader: Mark McConnell
Co-Leader: Eduard Kontar

The Presentations

(please contact the respective authors for questions or requests to use any content)

Measurements of the polarization, directivity and albedo of the solar flare hard X-ray flux can all be related to the angular distribution of the accelerated electrons.  Our group will focus on what the these measurements can tell us about the nature of the electron acceleration process.   We will consider the potential of these types of observations and evaluate what constraints the available data already place on acceleration models.  Our work will focus on the following :

  • How do beaming measurements impact our understanding of the acceleration process?
  • How do albedo measurements constrain the beaming of the accelerated particles?
  • A review of existing albedo measurements.
  • How do polarization measurements constrain the beaming of the accelerated particles?
  • A review of existing polarization measurements.
  • Prospects for future investigations.


The draft schedule can be viewed in your browser or imported into your favorite calendar software with this XML Calendar file (or iCal).

Working group 2 draft schedule

Monday, August 2
4:00 – 5:30 PM : X-Ray Albedo and Directivity

  • Introductory Remarks (McConnell)
  • Theoretical review of solar albedo (Kontar)
  • Observations of Directivity (Dickson)

Tuesday, August 3
11:00 – 12:30 PM :  Particle Acceleration and Beaming (JOINT SESSION WITH WG 6)

  • Relationship of  beaming to acceleration models (Emslie)

Wednesday, August 4
11:00 – 12:30 PM  :  X-Ray Footpoints

  • Visibilities and the lack of modulation in the finer grids (Hurford)
  • Footpoint size measurements (Dennis)
  • Effect of albedo on footpoint size (Kontar)
  • Theoretical & Observed Footpoint Sizes (Battaglia)
  • Comparison with EUV / Optical (Fletcher)

2:00 – 3:30 PM :  X-Ray Polarization

  • Review of polarization measurements (McConnell)
  • Review of polarization theory (Zharkova)

4:00 – 5:30 PM :  Summary Discussion

  • Review and discussion (McConnell / all)

10th RHESSI Workshop


The 10th RHESSI Workshop will take place from August 1-5th 2010 at the Historic Inns of Annapolis in Annapolis, Maryland.

Annapolis, Maryland

Image taken by fmorgen

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