wg 1 summary techniques and applications. wg1 sessions new algorithms: uv smooth, electron maps...
Post on 22-Dec-2015
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WG1 sessions
• New algorithms: UV smooth, electron maps
• Source locations
• Source sizes
• Source fluxes (imaging spectroscopy)
• Comparing different imaging algorithms
Talks will be available online.
Talks were limited to less than 10 slides, preferably 5.
Feb 20: 30-50 keV
CLEAN nat g3-9 CLEAN uni g3-9 CLEAN nat g1,3-9 UV smooth
MEM PIXON fwd fit VIS fwd fit
Summary of comparison of algorithm
• Source locations: good agreement (for simple source geometry, ~0.2” for Feb 20 footpoint)
• Source size: agreement ok, but choice of input parameters is important
• Source flux: within 20% (selection of box around the source introduces uncertainty)
Statistical study should be done!
How to improve our understanding of RHESSI imaging
Simulations (similar as has been done for spectroscopy): 1.Select different HXR source geometries (Brown, Emslie)2.Create simulated data (Schwartz)3.Use different imaging algorithms to reconstruct images4.Compare results at the next workshop
How to improve our understanding of RHESSI imaging
Simulations (similar as has been done for spectroscopy): 1.Select different HXR source geometries (Brown, Emslie)2.Create simulated data (Schwartz)3.Use different imaging algorithms to reconstruct images4.Compare results at the next workshopEstimate errors in images by simulation1.add noise to observations (calibrated event list)2.Make images for different representation of noise3.Calculate standard deviations
How to improve our understanding of RHESSI imaging
Simulations (similar as has been done for spectroscopy): 1.Select different HXR source geometries (Brown, Emslie)2.Create simulated data (Schwartz)3.Use different imaging algorithms to reconstruct images4.Compare results at the next workshopEstimate errors in images by simulation1.add noise to observations (calibrated event list)2.Make images for different representation of noise3.Calculate standard deviationsCompare with imaging at other wavelengthse.g. EUV or white light footpoints at high resolutione.g. SXR loops taken with XRT thick filters