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  • SPACE RADIATION  (25)
  • ASTROPHYSICS  (17)
  • SPACECRAFT INSTRUMENTATION  (2)
  • 11
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    Gamma-ray burst spectroscopy capabilities of the BATSE/GRO experiment (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A scintillation spectrometer is included in each of the eight BATSE/GRO detector modules, resulting in all-sky coverage for gamma-ray bursts. The scientific motivation, design and capabilities of these spectrometers for performing spectral observations over a wide range of gamma-ray energies and burst intensities are described.
    Schlagwort(e): SPACE RADIATION
    Materialart: OG-9.2-15 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 347-350; NASA-CP-2376-VOL-3
    Format: application/pdf
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  • 12
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    Advanced techniques for high resolution spectroscopic observations of cosmic gamma-ray sources (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: An advanced gamma-ray spectrometer that is currently in development is described. It will obtain a sensitivity of 0.0001 ph/sq cm./sec in a 6 hour balloon observation and uses innovative techniques for background reduction and source imaging.
    Schlagwort(e): SPACE RADIATION
    Materialart: OG-9.2-9 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 326-329; NASA-CP-2376-VOL-3
    Format: application/pdf
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  • 13
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    Spectra and positions of galactic gamma-ray sources (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The UCSD/MIT Hard X-Ray and Low Energy Gamma-Ray Experiment aboard HEAO-1 scanned the galactic center region during three epochs in 1977 and 1978 from 13 to 180 keV. The results are presented from the scanning epoch of 1978 September. Twenty-two known 2 to 10 keV source positions were necessary for an acceptable fit to the data. The spectra of the 16 strongest, least confused sources are all consistent with power laws with photon spectral indices ranging from 2.1 to 7.2. Acceptable fits to thermal bremsstrahlung models are also possible for most sources. No one source in this survey can be extrapolated to higher energy to match the intensity of the gamma-ray continuum as measured by HEAO-1 large field of view detectors, which implies that the continuum is a composite of contributions from a number of sources.
    Schlagwort(e): SPACE RADIATION
    Materialart: OG-2.5-7 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 217-220; NASA-CP-2376-VOL-1
    Format: application/pdf
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  • 14
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    Spectrum of the gamma-ray diffuse component observed from HEAO-1 (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The spectrum of the diffuse X and gamma ray background was measured between 15 keV and 4 MeV with the scintillation detectors aboard the HEAO 1 satellite. The apertures of the detectors were modulated on time scales of hours and the difference in counting rates measured the diffuse component flux. The observed spectrum is presented and compared with other measurements. At least two components are indicated, one below -100 keV and the other above. Possible origins are discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: OG-3.1-12 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 349-352; NASA-CP-2376-VOL-1
    Format: application/pdf
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  • 15
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    HEAO-1 observations of gamma ray bursts (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A search of data from the High Energy X-Ray and Low Energy Gamma Ray Experiment on HEAO-1 uncovered 14 gamma ray bursts. Nine of these events are reported for the first tiome. Except for the faintest events, all of the bursts detected by this experiment have been measured above an MeV, thereby confirming the hard spectral character of gamma ray burst spectra reported by SMM. Results give a burst rate of at least 105 per year above 6 times 10 to the minus 7th power ergs, which is consistent with previous measurements of burst frequency.
    Schlagwort(e): SPACE RADIATION
    Materialart: OG-1.1-1 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 1-4; NASA-CP-2376-VOL-1
    Format: application/pdf
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  • 16
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    HEAO-1 observations of Her X-1 at energies above 13 keV (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Results from preliminary analysis of HEAO-1 pointing observations of Her X-1 on three days in February 1978 are presented. Pulsed flux is detected up to approximately 70 keV with a clear indication of emission at approximately 60 deV which is above the continuum spectrum extrapolated from lower energies. If this excess emission is interpreted as a spectral line, its intensity varies from (1.2 plus or minus 0.2) x (10 to the minus 3 power) to (0.2 plus or minus 0.2) x (10 to the minus 3 power) ph/sq cm-sec with a time scale of one day. A factor 2 decrease in the low energy continuum is associated with the decrease in the excess emission.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 386-393
    Format: text
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  • 17
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    The cosmic gamma-ray spectrum between 0.3 and 27 MeV measured on Apollo 15. (1973)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Results of new measurements of the total cosmic gamma-ray spectrum in the 0.3- to 27-MeV range obtained on Apollo 15. These data were obtained with an isotropic scintillation counter similar to that used on Ranger 3 and ERS-18. The new high-precision data permit extension and clarification of the spectrum above 1 MeV, where recent balloon and earth-satellite observations have caused doubts as to the validity of the ERS-18 data.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 181; May 1
    Format: text
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  • 18
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    A search for hard X-rays from extragalactic objects. (1973)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Obtained results are reported on three known extragalactic sources - M87, M31, and 3C 273 - studied in the 20-300 keV range from balloons in 1970. With the possible exception of M87, a null result was obtained in each case. The statistical uncertainties of the M87 measurements are pointed out, and the implications of the null results are discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 179; Jan. 15
    Format: text
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  • 19
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    The cosmic gamma-ray spectrum between 0.3 and 27 MeV measured on the Apollo 15 (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The spectrum of the total (diffuse and discrete sources) cosmic gamma-ray background over the 0.3 to 27 MeV range was measured with a 7.0 cm diameter x 7.0 cm long uncollimated NaI(Tl) scintillation counter located on a boom 7.6 m from the Apollo 15 service module. Data on cosmic gamma-rays were taken during transearth coast at various boom extensions, detector gains, and with the plastic anticoincidence scintillator enabled and disabled.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-X-66104 , X-641-72-421
    Format: application/pdf
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  • 20
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    A new model of atmospheric gamma rays and its implications for measurement of diffuse cosmic gamma rays from within the atmosphere (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A semi-empirical model is discussed which describes atmospheric gamma rays in the range 0.3 less then or equal to E less than or equal to 10 MeV based on the production per unit mass of air. The model is based on the concept of a source strength (photon/g sec MeV) which is energy- and depth-dependent, and derived from measured fluxes. Quantities such as directional fluxes, angular distributions, and growth curves are calculated directly from this model. The source function is described by four energy-dependent parameters determined empirically from fluxes measured with a 7.5 cm x 7.5 cm Nal counter over the atmospheric depth range from 3.5 to 500 g/sq cm. From S(E,x), obtained for both continuum and discrete gamma rays at lambda = 40 deg, the depth and angle dependence of directional fluxes were calculated. Growth-curve predictions needed to separate atmospheric from diffuse cosmic fluxes were determined.
    Schlagwort(e): SPACE RADIATION
    Materialart: ESRO The Context and Status of Gamma Ray Astronomy; p 137-145
    Format: text
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