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					Hard X-Ray and Gamma-Rays
 as Fast Particle Diagnostics
            John C. Brown
             U.Glasgow




       RHESS – SOHO –TRACE
        Sonoma December 2004
3rd NESSI TOPICAL WORKSHOP
Glasgow March .. April … 2005
                OUTLINE OF TALK
Basic particle diagnostic problem- unknowns
Remote sensing diagnostics – observables

Electron transport and HXR (bremss?) radiation
Ion transport and nuclear amma-ray radiation

HXR Imaging diagnostics – (spectral) image reconstruction algorithms
HXR Spectral diagnostics – spectral inversion algorithms
HXR Timing diagnostics
HXR polarisation
H|XRs in relation to other wavelengths
Implications for electron energy budgets

Gamma-ray Imaging diagnostics
Gamma-ray Line Spectral diagnostics – widths, shifts, fluxes
Implications for ion energy budgets
        HXR bremss versus gamma-ray
RHESSI
HXR and
            line spatial structure
2.2 MeV
Gamma-ray
Images Hurford
et al 2003
23/7/03




Stochastic
Acceleration
interpretation
Emslie
Miller
and Brown
2003
‘Classic’ 2 footpoint HXR flare
RHESSI High Res Spectral Image
        HXRs as probe of solar density
Solar Atmospheric
density Structure n(h)
inferred from RHESSI
HXR source structure
assuming collision thick
Target, compared with
other models

- from Brown,
 Aschwanden
 et al 2003
Veronig & Brown discovery of
thick target coronal loop HXRs
                 Color Image: 6  12 keV
                 Contour lines: 25  50 keV
                 Integration time / image: 21 s
                 Time range: 00:01 00:16 UT
                 FoV: 64  64 arcsec
HXR/Type III/TRACE - Krucker
RHESSI HXR Footpoint Motion
  - Fletcher and Hudson 2003
Early Low Resoln HXR Bremss.
          Spectrum
Ge Detector High Resoln HXR
          Spectrum
Bremsstrahlung spectral inversion
               
                  F (E)
J ( )  n pVQo        q ( ,E )dE (thin)
                   E
                  
  Qo A

   K   q( ,E )  Fo ( Eo )dEo (thick)
                  E

Volterra  equations
For q  1( Kramers ) solutions are 
           E        dJ 
F (E)              d      sensitiveto noise in J
        n pVQo       E
             K d 2J 
Fo ( Eo )        2  hypersensitiveto noise in
            Qo A  d    E
                        Thin and thick target bremsstrahlung
                                       spectra

                  1000000
                  100000                              Photon
                                                      Spectrum
                    10000
flux per unit E




                    1000
                      100
                       10       Electron
                        1       Injection
                                Spectrum
                      0.1
                                             Mean Source
                     0.01                    Electron Spectrum
                    0.001
                            1                10                  100
                                            E(keV)
Ge Detector High Resoln HXR
          Spectrum
Deconvolved Bremsstrahlung Source
       Electron Spectrum
           Piana et al
Effect of directivity on spectral
           inversion
 Inferred Dynamic Electron
Spectrum with Variable High
Energy ‘Cutoff’ (Kontar et al)
RHESSI local electron spectral
 index d(E) – E. Kontar 2004
 August 03 Gap
spectrum - Kontar
Effect of Albedo on Gap (Kontar,
   C. Alexander, and Brown)
RHESSI NESSI Blind Inversion
 Game – Croupiers - Brown,
         Emslie
    Photon Spectrum 1
Recovered source e-spectrum – 1
    Massone, Kontar, Johns
Recovered Thick Target Injection Fo(Eo) –
    Case 1 – Massone, Kontar, Johns
 Blind Inversion
Photon Spectrum 2
Recovered source e-spectrum – 2
    Massone, Kontar, Johns
Recovered Thick Target Injection Fo(Eo) – 2
        – Massone, Kontar, Johns
 Blind Inversion
Photon Spectrum 3
Recovered source e-spectrum – 3
    Massone, Kontar, Johns
Recovered Thick Target Injection Fo(Eo) – 3
        – Massone, Kontar ? Johns
 Blind Inversion
Photon Spectrum 4
Recovered source e-spectrum – 4
    Massone, Kontar, Johns
Recovered Thick Target Injection Fo(Eo) – 4
        – Massone, Kontar ? Johns

				
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