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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


Photon Fits and ResidualsRegularized Method; =2.45


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


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


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


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

„Kink“ model:

Effects of Albedo and Non-constant Ionization Structure


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


NRH 327 MHz fields, but is consistent with albedo contribution

during 4 bursts

Between 131120 and 131140

RHESSI

25-50 keV


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