The High Energy Solar Physics Mission (HESP)

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Scientific paper

NASA's major solar flare project for the next solar maximum around the turn of the century is the High Energy Solar Physics Mission (HESP). The prime objective of HESP is to study the flare energy release, particle acceleration, and transport processes through high-resolution spatially-resolved spectroscopy of X-rays and gamma-rays. The strawman instrument for HESP to achieve this objective is the High Energy Imaging Spectrometer (HEISPEC). It will make imaging spectroscopy observations with an angular resolution of several arcseconds and an energy resolution of ~1 keV from a few keV to ~1 MeV and gamma-ray spectroscopy observations with similar energy resolution to 10 MeV. The plan is to launch HEISPEC in the year 2000 with a Pegasus launch vehicle into an equatorial orbit to obtain 2 - 3 years of observations during the next solar maximum. In order to fully interpret the HEISPEC observations, it will be necessary to obtain complementary observations of the thermal, ! dynamic, and magnetic context in which the high energy emissions are produced. Much of the necessary context information will be obtained from closely coordinated ground-based optical and radio observations. In addition, it is hoped that additional instruments will be flown on other US or foreign spacecraft to provide context soft X-ray and UV/EUV observations of the high temperature emissions not accessible from the ground.

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