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Michael Hosack J. Kevin Black Philip Deines-Jones Brian R. Dennis Joanne E. Hill Keith Jahoda Albert Y. Shih Christian E. Urba A. Gordon Emslie 《Experimental Astronomy》2011,32(2):101-125
We describe the design of a balloon-borne Imaging X-ray Polarimeter for Solar flares (IXPS). This novel instrument, a Time Projection Chamber (TPC) for photoelectric polarimetry, will be capable of measuring polarization at the few percent level in the 20?C50 keV energy range during an M- or X-class flare, and will provide imaging information at the ??10 arcsec level. The primary objective of such observations is to determine the directivity of nonthermal high-energy electrons producing solar hard X-rays, and hence to learn about the particle acceleration and energy release processes in solar flares. Secondary objectives include the separation of the thermal and nonthermal components of the flare X-ray emissions and the separation of photospheric albedo fluxes from direct emissions. 相似文献
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Parameters of wind waves in a deep-water zone of a reservoir is studied in the context of wave influence on shore stability. Data from measurements of wave parameters in reservoirs of Czech Republic are used. The relationship between the period and phase velocity of wind waves is discussed. 相似文献
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