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IMAGING SPECTROSCOPY WITH RHESSI

Dive into the spectral changes within a source, empirically studying processes affecting bremsstrahlung-producing electrons. Illustrated with an event on April 21, 2002, this research delves into light curves, photon spectra, contour maps, and conclusions that highlight spatial and temporal variations in hard X-ray spectra. Acknowledging the RHESSI team, Kim Tolbert, and Richard Schwartz.

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IMAGING SPECTROSCOPY WITH RHESSI

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  1. IMAGING SPECTROSCOPY WITH RHESSI Gordon Emslie University of Alabama in Huntsville

  2. Why Imaging Spectroscopy? • Examine spectral changes from point to point within source • Determine empirically the physical processes affecting the bremsstrahlung-producing electrons • Illustration – April 21, 2002 event

  3. Light Curve

  4. Light Curve Rise Peak Fall

  5. Photon Spectrum (90-second overall) Power-law index 3.5 (30 – 70 keV)

  6. 20-30 keV images Overall (90 s) Fall (30s) Peak (30 s) Rise (30 s)

  7. 30-40 keV images Overall (90 s) Fall (30 s) Rise (30 s) Peak (30 s)

  8. 40-50 keV images Overall (90 s) Rise (30 s) Peak (30 s) Fall (30 s)

  9. 50-70 keV image(90 second overall)

  10. 70-100 keV image(90 second overall)

  11. 20-50 keV Contour Maps (rescaled – 2” pixels) 1 Fall (30 s) Rise (30 s) Peak (30 s) 1 1 2

  12. Spectra at each footpoint Scaled =3.5 power-law • = 1  = 2 Rise (30 s) Fall (30 s) Peak (30 s)

  13. Conclusions • There are significant spatial (and temporal) variations in the hard X-ray spectrum throughout the source • Analysis of these variations (especially with detectors 1 and 2 operating) will reveal the form of the physical processes affecting the bremsstrahlung-producing electrons

  14. Acknowledgements • The RHESSI team • Kim Tolbert and Richard Schwartz

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