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  • SPACE RADIATION  (4)
  • Space Radiation  (2)
  • Astronautics (General)  (1)
  • GEOPHYSICS  (1)
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  • 1
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    INTEGRAL core programme (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The International Gamma Ray Astrophysics Laboratory (INTEGRAL) mission is described with emphasis on the INTEGRAL core program. The progress made in the planning activities for the core program is reported on. The INTEGRAL mission has a nominal lifetime of two years with a five year extension option. The observing time will be divided between the core program (between 30 and 35 percent during the first two years) and general observations. The core program consists of three main elements: the deep survey of the Galactic plane in the central radian of the Galaxy; frequent scans of the Galactic plane in the search for transient sources, and pointed observations of several selected sources. The allocation of the observation time is detailed and the sensitivities of the observations are outlined.
    Keywords: Astronautics (General)
    Type: ; 587-589
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  • 2
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    Measurement of the distribution in energy and angle of high-energy albedo neutrons and determination of an upper limit for the solar neutron flux (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: High energy albedo neutrons energy and angular distributions, determining solar neutron flux upper limit
    Keywords: SPACE RADIATION
    Type: ; ADEMIE DES SCIENCES
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  • 3
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    Gamma ray astronomy from satellites and balloons (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A survey is given of gamma ray astronomy topics presented at the Cosmic Ray Conference. The major conclusions at the Cosmic Ray Conference in the field of gamma ray astronomy are given. (1) MeV-emission of gamma-ray bursts is a common feature. Variations in duration and energy spectra from burst to burst may explain the discrepancy between the measured log N - log S dependence and the observed isotropy of bursts. (2) The gamma-ray line at 1.809 MeV from Al(26) is the first detected line from a radioactive nucleosynthesis product. In order to understand its origin it will be necessary to measure its longitude distribution in the Milky Way. (3) The indications of a gamma-ray excess found from the direction of Loop I is consistent with the picture that the bulk of cosmic rays below 100 GeV is produced in galactic supernova remnants. (4) The interpretation of the large scale distribution of gamma rays in the Milky Way is controversial. At present an extragalactic origin of the cosmic ray nuclei in the GeV-range cannot be excluded from the gamma ray data. (5) The detection of MeV-emission from Cen A is a promising step towards the interesting field of extragalactic gamma ray astronomy.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Nineteenth International Cosmic Ray Conference. Conference Papers: Invited Rapporteur, Highlight, Miscellaneous, Volume 9; 17 p
    Format: application/pdf
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  • 4
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    Low energy gamma ray observations with the MPI-Compton telescope (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Although the evaluation of data from the first balloon-flight of a large area Compton telescope is incomplete, two preliminary results are discussed. From the measured background spectrum at float altitude, the sensitivity of the telescope for the detection of cosmic gamma ray lines is estimated. The energy spectra is determined for an enhanced gamma ray flux observed from the direction of the Seyfert galaxy NGC 4151. A schematic drawing of the telescope is presented and discussed.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 207-216
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  • 5
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    Evidence for COMPTEL detections of low-energy gamma rays from HVC complexes (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observational evidence of extended MeV emissions that may be associated with high velocity clouds (HVCs) is reported on. Based on observations acquired between 1991 and 1996 with the Compton telescope (COMPTEL), evidence is found for intense gamma ray radiation at 0.75 to 3 MeV from the general direction of two HVC regions. One bright gamma ray excess is located between the HVC complexes M and A, adjacent to the Lockman hole and is seen to approximately cover a sky area of exceptionally low H I column densities. A second source is detected at the high velocity end of complex C near the Draco Nebula. Both gamma ray excesses appear to consist of a time variable source and a diffuse emission component. The enhanced diffuse soft X-rays seen by Rosat from both HVC regions may be closely related to the gamma ray emission in terms of bremsstrahlung arising from HVC interactions with the galactic disk or lower halo.
    Keywords: Space Radiation
    Type: Proceedings of 2nd INTEGRAL Workshop 'The Transparent Universe'; 119-122; ESA-SP-382
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  • 6
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    CEN A observation at MeV-energies (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During a balloon flight with the MPI Compton telescope from Uberaba/Brasil gamma-ray emission from the direction of Cen A was observed at MeV-energies. The observed flux connects to the X-ray spectrum of Cen A beyond 0.7 MeV and has a statistical significance of 4.1. The extension beyond 3 MeV has a significance of 3.8. Possible interpretations of the energy spectrum are discussed.
    Keywords: SPACE RADIATION
    Type: OG-2.7-7 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 273-276; NASA-CP-2376-VOL-1
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  • 7
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    INTEGRAL/SPI Observations of Electron-Positron Annihilation Radiation from our Galaxy (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The spectrometer on INTEGRAL (SPI) is a coded-aperture gamma-ray telescope with moderate angular resolution (3 deg) and superior energy resolution (2 keV at 511 kev). One of it's principal science goals is the detailed study of 511 keV electron-positron annihilation from our Galaxy. The origin of this radiation remains a mystery, however current morphological studies suggest an older stellar population. There has also been recent speculation on the possibility of the existence of light (〈 100 MeV) dark matter particles whose annihilation or decay could produce the observed 511 keV emission. In this paper we summarize the current results from SPI, compare them with previous results and discuss their implication on possible models for the production of the annihilation radiation.
    Keywords: Space Radiation
    Type: AAS Meeting; Jan 01, 2005; San Diego, CA; United States
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  • 8
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    Neutron measurements in near-Earth orbit with COMPTEL (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The fast neutron flux in near-Earth orbit has been measured with the COMPTEL instrument on the Compton Gamma Ray Observatory (CGRO). For this measurement one of COMPTEL's seven liquid scintillator modules was used as an uncollimated neutron detector with threshold of 12.8 MeV. The measurements cover a range of 4.8 to 15.5 GV in vertical cutoff rigidity and 3 deg to 177 deg in spacecraft geocenter zenith angle. One of the measurements occurred near the minimum of the deepest Forbush decrease ever observed by ground-level neutron monitors. After correction for solar modulation, the total flux is well fitted by separable functions in rigidity and zenith angle. With the spacecraft pointed near the nadir the flux is consistent with balloon measurements of the atmospheric neutron albedo. The flux varies by about a factor of 4 between the extremes of rigidity and a factor of 2 between the extremes of zenith angle. The effect of the spacecraft mass in shielding the detector from the atmospheric neutron albedo is much more important than its role as a source of additional secondary neutrons. The neutron spectral hardness varies little with rigidity or zenith angle and lies in the range spanned by earlier atmospheric neutron albedo measurements.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; A7; p. 12,243-12,249
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