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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. 5.5 r difference. Qualities of a “good” electron spectrum.

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Team ii summary

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
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
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


Team ii summary

Photon Fits and ResidualsRegularized Method; =2.45


Team ii summary

Photon Fits and ResidualsThermal plus Double-Power-Law Forward Fit






Results comparison 23 july 2003 00 30 00 00 30 20
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
Effects of Albedo II:

Following Bai and Ramaty (1978)

No albedo correction

With albedo correction


Johns lin 1992 cross sections
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
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


Team ii summary

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


Team ii summary

Effects of Albedo and Non-constant Ionization Structure fields, but is consistent with albedo contribution


Team ii summary

„Cutoff“ model: fields, but is consistent with albedo contribution

„Kink“ model:

Effects of Albedo and Non-constant Ionization Structure


Team ii summary

Vilmer et al. fields, but is consistent with albedo contribution

White: RHESSI 25-50 keV Hard X-rays

Black: RHESSI 12-25 keV Soft X-rays


Team ii summary

NRH 327 MHz fields, but is consistent with albedo contribution

during 4 bursts

Between 131120 and 131140

RHESSI

25-50 keV