High resolution hard X-ray spectra of solar and cosmic sources

Details High resolution hard X-ray spectra of solar and cosmic sources High resolution hard X-ray spectra of solar and cosmic sources

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........4s&link_type=abstract

Ph.D. Thesis California Univ., Berkeley. Dept. of Physics.

Astronomy and Astrophysics

Astronomy

8

Bremsstrahlung, Crab Nebula, Solar Flares, X Ray Astronomy, X Ray Imagery, Balloon-Borne Instruments, Electron Distribution, High Resolution, Imaging Techniques, Line Spectra, Radiative Transfer

Scientific paper

High resolution hard X-ray observations of a large solar flare and the Crab Nebula were obtained during balloon flights using an array of cooled germanium planar detectors. In addition, high time resolution high sensitivity measurements were obtained with a 300 square cm NaI/CsI phoswich scintillator. The Crab spectrum from both flights was searched without finding evidence of line emission below 200 keV. In particular, for the 73 keV line previously reported a 3 sigma upper limit for a narrow (1 keV FWHM) line .0019 and .0014 ph square cm/sec for the 1979 and 1980 flights, respectively was obtained.

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