Working Groups

RHESSI 11 will continue the series of RHESSI workshops but it also marks 40 years since the publication of Prof. John Brown's thick-target model paper which has since been the standard approach to interpret solar flare hard X-ray spectra.

The workshop will focus on topics/problems related to the understanding of energetic particles in solar flares. The workshop will have five groups covering a wide range of topics broadly related to thick-target model interpretation of solar flares. Up to three working group sessions will be run in parallel. The group topics have been designed with distinct agendas but also with some overlap to facilitate joint sessions. Considerable cross team flux, short of chaos, will be encouraged.

All groups encourage contributions on theory, simulations, observations and RHESSI instrumental/software issue. We discourage contributions unrelated to the working group agendas.

If there are any queries/problems please contact Eduard Kontar.

WG1: X-ray spectral issues and electron energetics:

Leaders: Anna Maria Massone (CNR - SPIN, Genova) & Marina Battaglia (University of Glasgow)

Spectral issues related to the understanding/interpretation of flare electron distributions; e.g. emission cross-sections, relativistic effects, relationship between HXR and electron spectra, directivity, polarization, low energy cutoffs, electron flux maps and spectroscopic issues of imaging/instrumental aspects.

WG2: Flare morphology and interconnections between X-ray sources:

Leaders: Astrid Veronig (University of Graz) & Pascal Saint-Hilaire (UC Berkeley)

Interrelationship between HXR sources at different locations within the flaring region; relationship between morphology and dynamics; e.g. looptop rise/descent, spectral differences/similarities between sources, relationship between coronal and footpoint sources etc.

WG3: Radio & X-ray flaring loops:

Leaders: Gordon Hurford (UC Berkeley/UNWS) & Gregory Fleishman (NJIT)

Radio and X ray emission from thermal plasma and non-thermal electrons in the loops/corona; e.g. electron evolution and transport in flaring loops, interrelation between radio and X-ray, simulation and data analysis of radio and X-ray coronal sources, EUV loop emission.

WG4: Footpoint signatures of energetic electrons:

Leaders: Iain Hannah (University of Glasgow)

X-ray footpoint sizes and geometry in the chromosphere, physics of footpoint emissions and sizes (e.g. X-ray albedo, cross-field transport), footpoints in other wavelengths, X-ray visibilities and instrumental effects affecting the sizes.

Note that WG4 will always meet with one of the other groups.

WG5: Low atmosphere response to electrons and ions:

Leaders: Alexander MacKinnon (University of Glasgow) / Ryan Milligan (Queen's University Belfast)

Evaporation, line and continuum emission, gamma-ray spectra, and energetic ion signatures, energetics.