Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1505d&link_type=abstract
American Astronomical Society, SPD meeting #42, #15.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Solar System's most powerful explosions occur as solar flares capable of releasing 1033 ergs of power and accelerating particles to 10s of GeV. Moving particles emit spectra which encode key information about acceleration processes and ambient plasma parameters, providing a powerful tool to study particle dynamics. Currently, the most detailed solar imaging and spectroscopy comes from the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) satellite. For the two best-observed flares, RHESSI found the location of ion emission sources were significantly displaced from electron sources in the flare footpoints. This result is surprising; the standard flare model predicts that ions and electrons are accelerated along the same field lines, implying that they would enter the chromosphere together and have similar emission source locations. Current acceleration models cannot account for the separate ion and electron footpoints. To explain this discrepancy and enhance understanding of particle acceleration and energy release in flares, enhanced spectroscopy and imaging of the gamma/HXR spectrum over wide ranges of energy and resolutions is required; the Gamma-Ray Imager/Polarimeter for Solar Flares (GRIPS) instrument is designed to address this need. GRIPS is optimized to provide high-resolution imaging, spectroscopy and polarimetry of gamma/HXR flare emissions from 20 keV to > 10MeV. GRIPS’ novel three dimensional germanium detector (3D-GeD) enables the use of a single grid imaging system, the multi-pitch rotating modulator (MPRM), that creates a nearly ideal point response function with quasi-continuous resolution from 12.5-162 arcsecs and a two-fold increased sensitivity over a bi-grid design like RHESSI. We present the design, capabilities, and recent progress on the GRIPS imaging and aspect systems.
Donakowski B.
Duncan Nicole
Hurford Gordon
Lin Runliang
Shih Albert
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