From Photons to Particles and Beyond RHESSI-NESSI: June 4-6, 2003 Team II Summary From Photons to Particles and Beyond RHESSI-NESSI: June 4-6, 2003

Motivation: 23 July 2003, 00:30:00 - 00:30:20 Solid: Holman et al. forward fit Boxes: Piana et al. 0th order regularization 5.5r difference

Qualities of a “good” electron spectrum Must correspond to a “good” fit to the photon spectrum Should contain as little a priori “information” as possible consistent with what is known about the physics of the emission process

Photon Fits and Residuals Regularized Method; =2.45

Photon Fits and Residuals Thermal plus Double-Power-Law Forward Fit

Residuals - Matrix Inversion

(R_TEST is an IDL procedure)

Smoothing the residuals

Smoothing the residuals

Results Comparison: 23 July 2003, 00:30:00 - 00:30:20 White: Johns & Lin (1992) Red: Piana et al. 0th order regularization

Pileup Corrections:

Pileup Corrections: Pileup Corrections: Note: not fully consistent as forward fit was not done to corrected photon spectrum

Effects of Albedo II: Following Bai and Ramaty (1978) No albedo correction With albedo correction

Johns & Lin (1992) Cross Sections Koch & Motz 1959, Rev. Modern Physics, 31, 920 See also erratum to Johns & Lin 1992, Sol. Phys., 142, 219

Action Items: Re-write bremspec in SSW - most accurate cross-section, e-n, e-i, e-e Optimize binning of Johns & Lin and translate to IDL with user friendly interface in SSW Implement rectangular form of regularization Put regularized inversions in SSW Mote Carlo simulations to evaluate significance of clustering in fit residuals Analyze more sources and times

Direction inconsistent with bulk motion on vertical magnetic fields, but is consistent with albedo contribution

Effects of Albedo and Non-constant Ionization Structure

Effects of Albedo and Non-constant Ionization Structure „Kink“ model: „Cutoff“ model:

Vilmer et al. White: RHESSI 25-50 keV Hard X-rays Black: RHESSI 12-25 keV Soft X-rays

NRH 327 MHz during 4 bursts Between 131120 and 131140 RHESSI 25-50 keV