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Solar Physics

, Volume 65, Issue 1, pp 25–37 | Cite as

The Hard X-Ray Burst Spectrometer on the Solar Maximum Mission

  • L. E. Orwig
  • K. J. Frost
  • B. R. Dennis
Article

Abstract

The primary scientific objectives of the Hard X-Ray Burst Spectrometer (HXRBS) to be flown on the Solar Maximum Mission are as follows: (1) To determine the nature of the mechanisms which accelerate electrons to 20–100 keV in the first stage of a solar flare and to > 1 MeV in the second stage of many flares; and (2) to characterize the spatial and temporal relation between electron acceleration, storage and energy loss throughout a solar flare.

Measurements of the spectrum of solar X-rays will be made in the energy range from 20 to 260 keV using an actively-shielded CsI(Na) scintillator with a thickness of 0.635 cm and a sensitive area of 71 cm2. Continuous measurements with a time resolution of 0.128 s will be made of the 15-channel energy-loss spectrum of events in this scintillator in anticoincidence with events in the CsI(Na) shield. Counting-rate data with a time resolution as short as 1 ms will also be available from a limited period each orbit using a 32K-word circulating memory triggered by a high event rate.

In the first year after launch, it is expected that approximately 1000 flares will be observed above the instrument sensitivity threshold, which corresponds to a 20–200 keV X-ray flux of 2 × 10−1 photons (cm2 s)−1 lasting for at least one second.

Keywords

Flare Event Rate Time Resolution Solar Flare Temporal Relation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Co. 1980

Authors and Affiliations

  • L. E. Orwig
    • 1
  • K. J. Frost
    • 1
  • B. R. Dennis
    • 1
  1. 1.Laboratory for Astronomy and Solar Physics, NASA-Goddard Space Flight CenterGreenbeltU.S.A.

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