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Flare Imaging & Spectroscopy

Flare Imaging & Spectroscopy. RHESSI Imaging. RHESSI uses ‘collimating optics’ - slits and slats. Only X-rays from certain directions can be detected. Rotation axis. Germanium detector. See more details in Hurford et al. 2002, Solar Physics. Slats rotate past source. Detector

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Flare Imaging & Spectroscopy

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  1. Flare Imaging & Spectroscopy

  2. RHESSI Imaging RHESSI uses ‘collimating optics’ - slits and slats Only X-rays from certain directions can be detected Rotation axis Germanium detector See more details in Hurford et al. 2002, Solar Physics

  3. Slats rotate past source Detector Illumination Modulation patterns How RHESSI makes an image • The grid pairs are coaligned so that they modulate the X-rays from a source that is off center from the axis of symmetry. The entire spacecraft is rotated so that the metal bars called slats block the source and then the openings called slits allow the source to shine on the detector. This means that the detector sees a brightening and darkening source in a regular pattern. The rate of change in the brightness is dependent upon the angle from the rotational axis and the orientation of the source in the sky with respect to the rotating grid position. • Modulated brightness patterns from all 9 grid pairs are combined to reconstructthe most likely source intensity distribution

  4. RHESSI website • RHESSI browser • RHESSI wiki • RHESSI Imaging - First Steps • RHESSI Spectroscopy - OSPEX User Guide

  5. Candidate Events • M 2013 Mar 21 ~22:00 UT • M 2013 Apr 11 ~07:00 UT • M 2013 Apr 12 ~20:30 UT • M 2013 May 2 ~05:00 UT • M 2013 May 3 ~17:30 UT • X 2013 May 13 ~02:00 UT • X 2013 May 13 ~16:00 UT • X 2013 May 15 ~01:30 UT • M 2013 May 22 ~13:00 UT • X 2013 Oct 25 ~08:00 UT • X 2013 Oct 25 ~ 15:00 UT • X 2013 Oct 28 ~02:00 UT • X 2013 Nov 10 ~05:15 UT

  6. Assignment • Evolution • Temporal: lightcurve • Spatial: morphology • Spectral: fitting parameters

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