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HESSI Science Objective

HESSI Science Objective. To explore the basic physics of particle acceleration and explosive energy release in Solar Flares. Impulsive Energy Release in the Corona Acceleration of Electrons, Protons, and Ions Plasma Heating to Tens of Millions of degrees

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HESSI Science Objective

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  1. HESSI Science Objective To explore the basic physics of particle acceleration and explosive energy release in Solar Flares • Impulsive Energy Release in the Corona • Acceleration of Electrons, Protons, and Ions • Plasma Heating to Tens of Millions of degrees • Energy and Particle Transport and Dissipation

  2. HESSI Status • All flight grids delivered to Goddard and in process of being characterized and tested for flight. • Telescope structure and aspect system being prepared at the Paul Scherrer Institut in Switzerland. • EM cryostat with 2 of 9 germanium detectors under test with Goddard-supplied Sunpower cooler in Berkeley. • Spectrum Astro building spacecraft in Phoenix. • Launch scheduled for July 2000 on a Pegasus XL launch vehicle into a 600-km, 38º inclination orbit from KSC.

  3. HESSI Top Grid Tray

  4. Tecomet Grid #1 Material: Molybdenum Pitch: 34 microns Slit width: 15 microns Total thickness: 1.2 mm Layer thickness: 15 microns No. of layers: 75 Active area: 9 cm diameter Aspect ratio: >50:1 • Second of two identical grids fabricated by Thermo Electron Tecomet in Woburn, MA. • Finest, high-aspect-ratio X-ray collimator ever made. • Provides modulation to X-ray energies in excess of 100 keV. • Allows imaging on HESSI with an angular resolution of 2 arcseconds. • Picture shows circular active area with fiducial and mounting features in the integral rim. • Direction of slits is revealed by the white bar at 45º resulting from light transmitted from below through the ~1º opening angle of each slit.

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