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Proceedings Paper

High-Energy Solar Spectroscopic Imager (HESSI) Small Explorer mission for the next (2000) solar maximum
Author(s): Robert P. Lin; Gordon J. Hurford; Norman W. Madden; Brian R. Dennis; Carol Jo Crannell; Gordon D. Holman; Reuven Ramaty; Tycho T. von Rosenvinge; Alex Zehnder; H. Frank van Beek; Patricia L. Bornmann; Richard C. Canfield; A. Gordon Emslie; Hugh S. Hudson; Arnold Benz; John C. Brown; Shinzo Enome; Takeo Kosugi; Nicole Vilmer; David M. Smith; Jim McTiernan; Isabel Hawkins; Said A. Slassi-Sennou; Andre Csillaghy; George Fisher; Chris Johns-Krull; Richard Schwartz; Larry E. Orwig; Dominic Zarro; Ed Schmahl; Markus A. Aschwanden; Peter R. Harvey; David W. Curtis; David H. Pankow; David Clark; Robert F. Boyle; Reinhold Henneck; Akilo Michedlishvili; Knud Thomsen; Jeff Preble; Frank Snow
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Paper Abstract

The primary scientific objective of the High Energy Solar Spectroscopic Imager (HESSI) Small Explorer mission selected by NASA is to investigate the physics of particle acceleration and energy release in solar flares. Observations will be made of x-rays and (gamma) rays from approximately 3 keV to approximately 20 MeV with an unprecedented combination of high resolution imaging and spectroscopy. The HESSI instrument utilizes Fourier- transform imaging with 9 bi-grid rotating modulation collimators and cooled germanium detectors. The instrument is mounted on a Sun-pointed spin-stabilized spacecraft and placed into a 600 km-altitude, 38 degrees inclination orbit.It will provide the first imaging spectroscopy in hard x-rays, with approximately 2 arcsecond angular resolution, time resolution down to tens of ms, and approximately 1 keV energy resolution; the first solar (gamma) ray line spectroscopy with approximately 1-5 keV energy resolution; and the first solar (gamma) -ray line and continuum imaging,with approximately 36-arcsecond angular resolution. HESSI is planned for launch in July 2000, in time to detect the thousands of flares expected during the next solar maximum.

Paper Details

Date Published: 2 November 1998
PDF: 11 pages
Proc. SPIE 3442, Missions to the Sun II, (2 November 1998); doi: 10.1117/12.330245
Show Author Affiliations
Robert P. Lin, Univ. of California/Berkeley (United States)
Gordon J. Hurford, California Institute of Technology (United States)
Norman W. Madden, Univ. of California/Berkeley (United States)
Brian R. Dennis, NASA Goddard Space Flight Ctr. (United States)
Carol Jo Crannell, NASA Goddard Space Flight Ctr. (United States)
Gordon D. Holman, NASA Goddard Space Flight Ctr. (United States)
Reuven Ramaty, NASA Goddard Space Flight Ctr. (United States)
Tycho T. von Rosenvinge, NASA Goddard Space Flight Ctr. (United States)
Alex Zehnder, Paul Scherrer Institute (Switzerland)
H. Frank van Beek, Delft Univ. of Technology (Netherlands)
Patricia L. Bornmann, NOAA (United States)
Richard C. Canfield, Montana State Univ. (United States)
A. Gordon Emslie, Univ. of Alabama in Huntsville (United States)
Hugh S. Hudson, Univ. of California/San Diego (Japan)
Arnold Benz, Institute of Astronomy ETHZ (Switzerland)
John C. Brown, Univ. of Glasgow (United Kingdom)
Shinzo Enome, National Astronomical Observatory (Japan)
Takeo Kosugi, ISAS (Japan)
Nicole Vilmer, Observatoire de Paris (France)
David M. Smith, Univ. of California/Berkeley (United States)
Jim McTiernan, Univ. of California/Berkeley (United States)
Isabel Hawkins, Univ. of California/Berkeley (United States)
Said A. Slassi-Sennou, Univ. of California/Berkeley (United States)
Andre Csillaghy, Univ. of California/Berkeley (Switzerland)
George Fisher, Univ. of California/Berkeley (United States)
Chris Johns-Krull, Univ. of California/Berkeley (United States)
Richard Schwartz, NASA Goddard Space Flight Ctr. (United States)
Larry E. Orwig, NASA Goddard Space Flight Ctr. (United States)
Dominic Zarro, NASA Goddard Space Flight Ctr. (United States)
Ed Schmahl, Univ. of Maryland (United States)
Markus A. Aschwanden, Lockheed Martin (United States)
Peter R. Harvey, Univ. of California/Berkeley (United States)
David W. Curtis, Univ. of California/Berkeley (United States)
David H. Pankow, Univ. of California/Berkeley (United States)
David Clark, NASA Goddard Space Flight Ctr. (United States)
Robert F. Boyle, NASA Goddard Space Flight Ctr. (United States)
Reinhold Henneck, Paul Scherrer Institute (Switzerland)
Akilo Michedlishvili, Paul Scherrer Institute (Switzerland)
Knud Thomsen, Paul Scherrer Institute (Switzerland)
Jeff Preble, Spectrum Astro (United States)
Frank Snow, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 3442:
Missions to the Sun II
Clarence M. Korendyke, Editor(s)

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