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  • 1
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    Trapped-proton energy spectrum determination (M0002-1) (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The objective of this experiment is to measure the flux and energy spectrum of protons with energies of 1 to MeV. These protons are trapped on the Earth's magnetic field lines as part of the inner radiation belt, or Van Allen zone. The proton will be encountered predominantly in the South Atlantic anomaly at a 90 deg pitch angle.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA. Langley Research Center Long Duration Exposure Facility (LDEF); p 109-112
    Format: text
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  • 2
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    The diffuse X-ray background spectrum from 3 to 50 keV (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The spectrum of the extragalactic diffuse X-ray background has been measured with the GSFC Cosmic X-ray Experiment on HEAO 1 for regions of the sky away from known point sources and more than 20 deg from the galactic plane. A total exposure of 80 sq m-s-sr is available at present. Free-free emission from an optically thin plasma of 40 plus or minus 5 keV provides an excellent description of the observed spectrum from 3 to 50 keV. This spectral shape is confirmed by measurements from five separate layers of three independent detectors. With an estimated absolute precision of about 10%, the intensity of the emission at 10keV is 3.2 keV/keV/sq cm/s/sr, a value consistent with the average of previously reported spectra. A uniform hot intergalactic medium of approximately 36% of the closure density of the universe would produce such a flux, although nonuniform models indicating less total matter are probably more realistic.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; vol. 235
    Format: text
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  • 3
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    A 5.57 hour modulation of the X-ray flux of 4U1822-37: A new model for CYG X-3 (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The X-ray flux of 4U1822-37 is shown to be modulated with the 5.57 hour period of its optical counterpart. The X-ray light curve is two component with a smooth sinusoidal like 25 percent semiamplitude modulation and a 30 minute dip approximately 0.2 in phase following the other minimum. The X-ray spectrum is a relatively flat power law up to 17 keV, above which its steepens. Iron emission is detected at 6.7 keV with a 4 keV FWHM and an equivalent width of 1100 eV. There is an excee below 2 keV that is consistent with either a 0.25 keV thermal component or 350 eV equivalent width iron L emission. A slight softening of the spectrum is seen during both X-ray minima. The dip is interpreted as the partial occultation of an extended cloud of optically thick highly ionized material surrounding the central X-ray source. Modeling the eclipse gives a system inclination of 70-79 deg and a spherical cloud radius of 0.2-0.3 solar radius. Models for the long term modulation are considered. The properties of this source are compared to those of Cyg X-3. It is concluded that they are similar systems.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-82079
    Format: application/pdf
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  • 4
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    Super-alfvenic propagation of cosmic rays: The role of streaming modes (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Numerous cosmic ray propagation and acceleration problems require knowledge of the propagation speed of relativistic particles through an ambient plasma. Previous calculations indicated that self-generated turbulence scatters relativistic particles and reduces their bulk streaming velocity to the Alfven speed. This result was incorporated into all currently prominent theories of cosmic ray acceleration and propagation. It is demonstrated that super-Alfvenic propagation is indeed possible for a wide range of physical parameters. This fact dramatically affects the predictions of these models.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-82032
    Format: application/pdf
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  • 5
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    The X-ray spectrum of QSO 0241+622 (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Proportional counters on the OsO-8 spacecraft measured the X-ray spectrum of QSR 0241+622 in the range 2-50 keV. The best power law fit has a proton spectral index and 90 percent errors gamma = 1.93 (+0.5, -0.3) and low energy absorption consistent with reported gas column densities, but a thermal bremsstrahlung form with temperature 13.1 keV cannot be excluded. No indication of spectral variability is found in three observations of the source with HEAO-A2, although a possible 15-30 percent intensity change over a period of 6 months was observed. The quasar is similar to 3C 273 in the proportion of energy emitted in various bands, excluding the radio, if reported radiation above 50 keV from its direction is indeed associated with QSO 0241+622. The two quasars are compared and possible energy generation scenarios are discussed. Implications concerning quasar contributions to the diffuse background are discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-80645
    Format: application/pdf
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  • 6
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    The HEAO A-2 survey of Abell clusters and the X-ray luminosity function (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The HEAO A-2 all sky data base was surveyed for 2-10KeV X-rau emission from the 225 Abell clusters og galaxies listed in Abell's (1958) catalog which are of distance class four or less, and are within the fraction of the sky surveyed completely by Abell. Thirty-two identifications of clusters with X-ray sources were made, for which 2-10 KeV fluxes and 90% error boxes are presented. Twelve of these identification are new. The X-ray luminosity function was derived for this statistically complete sample and the best exponential fit was found to be f(L) = 20.2 x 10 to the minus 8 power exp (-l(44)/1.9) per cu Mpc 2-10KeV. The relationship between X-ray luminosity and richness was examined and a correlation was found for richness classes 0, 1, and 2. The relationship of X-rau luminosity, Bautz-Morgan type, and Rood-Sastry type was examined. It was found that BM type I's and RS type cD and B have the greatest average luminosity. The contribution of clusters to the X-ray background was calculated from the luminosity function and was found to be 5%, and with 90% certainty, less than 8% in the 2-10 KeV band pass.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-80680
    Format: application/pdf
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  • 7
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    X-ray spectrum of Kepler's SNR (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Observations made with the solid state spectrometer aboard the Einstein Observatory confirm Kepler's SNR as an X-ray source with an intensity between 1-3 KeV of 7.2 x 10 to the-11th power ergs/sq cm-s. The X-ray spectrum is similar to those of Cas A and Tycho, with strong line emission from the helium-like species of Si, S, and Ar. Direct comparisons to Tycho's SNR suggest a distance of Kepler's SNR of greater than or equal to 5 kpc.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-80637
    Format: application/pdf
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  • 8
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    Is the remnant of SN1006 crab-like? (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The solid state spectrometer on the Einstein Observatory and the GSFC cosmic X-ray spectrometer on OSO-8 observed the X-ray spectrum of SN1006. The data can be well-represented by a power-law model with alpha = 1.2, similar to the spectrum of the Crab nebula. This is in contrast to the radio and X-ray maps of SN1006 which show a shell structure more typical of SNR with thermal X-ray emission. The X-ray spectrum is suggestive of nonthermal synchrotron emission, raising the possibility that the remnant of SN1006 contains a source of relativistic electrons.
    Schlagwort(e): SPACE RADIATION
    Materialart: NASA-TM-80689
    Format: application/pdf
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  • 9
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    The isotopic composition of neon in the galactic cosmic rays - A high resolution measurement (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Schlagwort(e): SPACE RADIATION
    Materialart: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
    Format: text
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  • 10
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    A measurement of the isotopic composition of galactic cosmic ray carbon, nitrogen and oxygen (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The paper reports the results of an investigation of the isotopic composition of galactic cosmic ray carbon, nitrogen and oxygen (80-230 MeV/amu) made using the U.C. Berkeley HKH instrument aboard the ISEE-3 spacecraft. The combination of high mass resolution and a large statistical sample makes possible a precise determination of the relative isotopic abundances for these elements. In local interplanetary space the following values are found: C-13/C = 0.067 + or - 0.008, N-15/N = 0.54 + or - 0.03, O-17/O less than 0.027, and O-18/O - 0.019 + or - 0.003.
    Schlagwort(e): SPACE RADIATION
    Materialart: CONF-790836-3 , LBL-8920 , International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
    Format: text
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