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Wide Band Spectrometer

NSSDCA ID: 1991-062A-03

Mission Name: Yohkoh
Principal Investigator:Dr. Jun Nishimura

Description

The Wide Band Spectrometer (WBS) consists of three subinstruments that together span the energy range from 2 keV to 100 MeV. They are (1) the soft X-ray spectrometer (SXS), a gas proportional counter filled with Xe and CO2 that covers the 2 to 30 keV band, (2) the hard X-ray spectrometer (HXS), a NaI scintillator that covers the energy range 20 - 600 keV, and (3) the gamma-ray spectrometer (GRS), a pair of identical BGO scintillators (Bi4 Ge3 O12), that cover the 0.2 - 100 MeV band. SXS has a FOV 10 deg square, has a sensitive area of approximately 12 cm**2, divides its energy range into 128 channels, and records 128-channel spectra every 2 s, 2-channel spectra every 0.25 s. The energy resolution at 5.9 keV is approximately 20% (FWHM). The HXS records pulse height data in 32 quadratically spaced channels over the 20 - 400 keV range every 1 s, and 2-channel pulse count data for the bands 20 - 50 keV and 50 - 600 keV every 0.125 s. The GRS has a resolution approximately twice that of the HXS, and records a 128-channel energy-loss spectrum, which is processed via spectral deconvolution to yield the incident gamma- ray spectrum. 128-channel spectra are recorded every 4 s. An assortment of other time resolutions apply for various energy channels. GRS also has detection sensitivity to solar flare neutrons.

Alternate Names

  • Yohkoh/WideBandSpectrometer

Facts in Brief

Bit rate (avg): 0.001 kbps

Funding Agency

  • Institute of Space and Aeronautical Science, U of Tokyo Japan

Disciplines

  • Solar Physics: X-Ray
  • Solar Physics: Visible

Additional Information

Questions and comments about this experiment can be directed to: Dr. H. Kent Hills

 

Personnel

NameRoleOriginal AffiliationE-mail
Mr. Mons D. MorrisonExperiment Data ManagerLockheed Palo Altomorrison@sxt2.spasci.com
Mr. Sam FreelandGeneral ContactLockheed Palo Altofreeland@penumbre.nascom.nasa.gov
Prof. Ichiro KondoOther InvestigatorShibaura Institute of Technology
Mr. Tetsuya WatanabeOther InvestigatorNational Astronomical Observatory of Japanb31056@tansei.cc.u-tokyo.ac.jp
Dr. Jun NishimuraPrincipal InvestigatorInstitute of Space and Aeronautical Scienceanb05012@nifty.com

Selected References

  • Morrison, M. D., et al., Solar-A reformatted data files and observing log, Solar Phys., 136, No. 1, 105-110, Nov. 1991.
  • Yoshimori, M., et al., The Wide band spectrometer for the Solar-A mission, Solar Phys., 136, No. 1, 69-88, Nov. 1991.
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