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  • SPACE RADIATION  (85)
  • SOLAR PHYSICS
  • 1980-1984
  • 1970-1974  (112)
  • 1974  (112)
  • 1
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    Pioneer 10 observations of the solar wind interaction with Jupiter (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Detailed analysis of the Pioneer 10 plasma analyzer experiment flight data during the Jupiter flyby in late November and early December 1973 has been performed. The observations show that the interaction of Jupiter's magnetic field with the solar wind is similar in many ways to that at earth, but the scale size is over 100 times larger. Jupiter is found to have a detached standing bow shock wave of high Alfven Mach number. Like the earth, Jupiter has a prominent magnetopause that deflects the magnetosheath plasma and excludes its direct entry into the Jovian magnetosphere. Unlike that of the earth, the sunward hemisphere of Jupiter's outer magnetosphere is found to be highly inflated with thermal plasma and a high-beta region that is highly responsive to changes in solar wind dynamic pressure.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 79; Sept. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Pioneer 10 observations of the solar wind interation with Jupiter (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Pioneer 10 Plasma Analyzer experiment flight data during the Jupiter flyby are presented. The observations show that the interaction of Jupiter's magnetic field with the solar wind is similar in many ways to that at earth, but the scale size is over 100 times larger. Jupiter is found to have a detached standing bow shock wave of high Alfven Mach number. Jupiter has a prominent magnetopause which deflects the magnetosheath plasma and excludes its direct entry into the Jovian magnetosphere. The sunward hemisphere of Jupiter's outer magnetosphere is found to be highly inflated with thermal plasma and a high beta region which is highly responsive to changes in solar wind dynamic pressure. Observational arguments are presented which tend to discount a thin disklike magnetosphere but, rather, favor a Jovian magnetosphere, albeit probabily considerably flattened as compared to the earth's magnetosphere, yet still with reasonable thickness. Results concerning the shock jump conditions, the magnetosheath flow field and inferred internal magnetospheric plasma are presented.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-62357
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Observations of discrete gamma ray sources with SAS-2 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Compact gamma ray sources centered on the Crab nebula and the Vela X supernova remnant are considered. An excess in the galactic radiation was observed in both regions. Data indicate that a large fraction of this flux is pulsed. The excess from the Vela region could reflect either a large-scale galactic feature, such as a superposition of spiral arm segments, or it could be associated with the Vela supernova remnant. Low-energy gamma ray bursts were observed in the SAS-2 anticoincidence shielding.
    Keywords: SPACE RADIATION
    Type: ESRO The Context and Status of Gamma Ray Astronomy; p 273-277
    Format: text
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  • 4
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    Gamma radiation from the Crab Nebula above 35 MeV (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SPACE RADIATION
    Type: Nature; 251; Oct. 4
    Format: text
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  • 5
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    Solar cosmic ray composition above 10 MeV/nucleon and its energy dependence in the 4 August 1972 event (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 39; Dec. 197
    Format: text
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  • 6
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    SAS-2 observations of celestial diffuse gamma radiation above 30 MeV (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The small astronomy satellite, SAS-2, used a 32-deck magnetic core digitized spark chamber to study gamma rays with energies above 30 MeV. Data for four regions of the sky away from the galactic plane were analyzed. These regions show a finite, diffuse flux of gamma rays with a steep energy spectrum, and the flux is uniform over all the regions. Represented by a power law, the differential energy spectrum shows an index of 2.5 + or - 0.4. The steep SAS-2 spectrum and the lower energy data are reasonably consistent with a neutral pion gamma-ray spectrum which was red-shifted (such as that proposed by some cosmological theories). It is concluded that the diffuse celestial gamma ray spectrum observed presents the possibility of cosmological studies and possible evidence for a residual cosmic ray density, and supports the galactic superclusters of matter and antimatter remaining from baryon-symmetric big bang.
    Keywords: SPACE RADIATION
    Type: ESRO The Context and Status of Gamma Ray Astronomy; p 83-88
    Format: text
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  • 7
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    SAS-2 observations of the high-energy gamma radiation from the Vela region (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 190; June 1
    Format: text
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  • 8
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    Laser-plasma spectra of highly ionized fluorine (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Lines between 11.3 and 17.2 A of lithium-like, helium-like, and hydrogen-like fluorine have been observed in spectra of laser-produced plasmas. These lines include nine members of the Lyman series of F IX; eight members of the principal series of F VIII; and satellite lines arising from doubly excited configurations of F VII and F VIII. Similar satellite lines of the abundant solar elements have been identified in soft X-ray spectra of solar flares. A wavelength list of fluorine lines is given, and physical conditions in the plasma are discussed.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 187; Jan. 15
    Format: text
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  • 9
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    SAS-2 observations of the high energy gamma radiation from the Vela region (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data from a scan of the galactic plane by the SAS-B high energy gamma ray experiment in the region 250 deg smaller than 12 smaller than 290 deg show a statistically significant excess over the general radiation from the galactic plane for gamma radiation of energy larger than 100 MeV. If the enhanced gamma radiation results from interactions of cosmic rays with galactic matter, as the energy spectrum suggests, it seems reasonable to associate the enhancement with large scale galactic features, such as spiral arm segments in that direction, or with the region surrounding the Vela supernova remnant with which PSR 0833-45 is associated. If the excess is attributed to cosmic rays released from the supernova interacting with the interstellar matter in that region, than on the order of 3 x 10 to the 50th power ergs would have been released by that supernova in the form of cosmic rays.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70602 , X-662-74-58
    Format: application/pdf
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  • 10
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    Solar cosmic ray composition above 10 MeV/nucleon and its energy dependence in the 4 August 1972 event (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Observations of the proton, helium (C,N,O) and Fe-group nuclei fluxes made during the large 4 August 1972 solar particle event are presented. The results show a small, but significant variation of the composition of multicharged nuclei as a function of energy in the energy region above 10 MeV/nucleon. In particular, the He/(C,N,O) abundance ratio varies by a factor approximately 2 between 10 and 50 MeV/nucleon, and the Fe-group/(C,N,O) ratio suggests a similar variation. Abundance ratios from the 4 August 1972 event are compared as a function of energy with ratios measured in other solar events. At energies approximately greater than 50 MeV/nucleon, the He/(C,N,O) abundance ratio for August 1972 is consistent with all earlier measurements made above that energy.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70590 , X-662-74-32
    Format: application/pdf
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