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  • Other Sources  (8)
  • 1970-1974  (8)
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  • 1
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    Adaptive signal processing through stochastic approximation (1971)
    In:  Geophys. Prosp., Taipei, AGU, vol. 19, no. 3, pp. 718-728, pp. B06410, (ISSN: 1340-4202)
    Details
    Publication Date: 1971
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Modulation of low-energy galactic cosmic rays over solar maximum /cycle 20/. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Low-energy (about 60 MeV/nucleon) galactic cosmic rays observed during the recent period of solar maximum are reviewed. For this particular cycle, a significant time lag between intensity changes in the low-energy and high-energy components has been observed. Several possible explanations of this 'hysteresis effect' are discussed. The cosmic-ray intensity gradients provided by Pioneer 10 are soon to be available and are expected to provide a more definite clue to this process of cosmic-ray modulation.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 77; Dec. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Observations of the scatter-free solar-flare electrons in the energy range 20-1000 keV (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Observations of the scatter-free electron events from solar active region McMath No. 8905 are presented. The measurements were made on Explorer 33 satellite. The data show that more than 80% of the electrons from these events undergo no or little scattering and that these electrons travel only approximately 1.5 a.u. between the sun and the earth. The duration of these events cannot be accounted fully by velocity dispersion alone. It is suggested that these electrons could be continuously injected into interplanetary medium for a time interval of approximately 2 to 3 minutes. Energy spectra of these electrons are discussed.
    Keywords: SPACE RADIATION
    Type: Goddard Space Flight Center Contrib. to the Twelfth Intern. Conf. on Cosmic Rays; p 65-70
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The modulation of low energy galactic cosmic rays over solar maximum (cycle 20) (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A preliminary report is presented on detailed observations of low energy approximately (60 MeV/nucleon) galactic cosmic rays made during the recent period of solar maximum. For this particular cycle a significant time lag between intensity changes in the low energy and high energy components was observed. There are a number of possible explanations of this hysteresis effect. In the simplest form these include either changes in the form of the magnetic field power spectrum or changes in the size of the effective modulating region, or both.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-65989 , X-660-72-292
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    The coronal transport of the flare associated scatter free electrons (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A total of 11 scatter-free electron events from McMath plage region 8905 were observed by IMP 4 during the period from 29 July to 3 August 1967. The transit times and duration of these electron events are examined in detail. The duration of 170- to 1000-keV electrons shows a strong dependence upon the heliolongitude of the associated flare. Typical values of the duration full width at half maximum vary from 4 min at 50 deg W to 12 min at 10 deg and 90 deg W heliolongitudes. In addition, the difference in times at which the maximum intensities of the 22- to 45-keV and 170- to 1000-keV electrons occur is observed to change from 18 min near 50 deg W to 13 min at 10 deg and 90 deg W heliolongitudes. An idealized two-dimensional diffusion model for the transport of these electrons in the solar corona is proposed. The 22- to 45-keV electrons escape promptly from flare site to the feet of the interplanetary magnetic field lines, whereas 170- to 1000-keV electrons suffer slight scattering. The diffusion coefficient for 170- to 1000-keV electrons is estimated to be 3 X 10 to the 18th power sq cm/sec. Finally, a possible relation between the scatter-free and the classical diffusive-type electron events is discussed.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-65887 , X-661-72-76
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    NASA TECHNICAL REPORTS
  • 6
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    Cold-welding test environment (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A flight test was conducted and compared with ground test data. Sixteen typical spacecraft material couples were mounted on an experimental research satellite in which a motor intermittently drove the spherical moving specimens across the faces of the fixed flat specimens in an oscillating motion. Friction coefficients were measured over a period of 14-month orbital time. Surface-to-surface sliding was found to be the controlling factor of generating friction in a vacuum environment. Friction appears to be independent of passive vacuum exposure time. Prelaunch and postlaunch tests identical to the flight test were performed in an oil-diffusion-pumped ultrahigh vacuum chamber. Only 50% of the resultant data agreed with the flight data owing to pump oil contamination. Identical ground tests were run in an ultrahigh vacuum facility and a ion-pumped vacuum chamber. The agreement (90%) between data from these tests and flight data established the adequacy of these test environments and facilities.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-125603 , JPL-TR-32-1547
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A catalogue of solar cosmic ray events: IMPS 4 and 5, May 1967 - December 1972 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This catalogue of solar cosmic ray events has been prepared for the use of solar physicists and other interested scientists. It contains some 185 solar particle events detected by the Goddard Space Flight Center Cosmic Ray Experiments on IMP's IV and V (Explorer 34 and 41) for the period May 1967 - December 1972. The data is presented in the form of hourly averages for three proton energy intervals - 0.9 - 1.6 MeV; 6 - 20 MeV and 20 - 80 MeV. In addition the time histories of .5 - 1.1 MeV electrons are shown on a separate scale. To assist in the identification of related solar events, the onset time of the electron event is indicated. The details of the instrumentation and detector techniques are described. Further descriptions of data reduction procedure and on the time-history plots are given.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70629 , X-661-74-27
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    The modulation of low energy galactic cosmic rays (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It has been clearly established by several different experiments that following the last solar maximum (about 1969), there was a significant phase lag or hysteresis effect between changes in the low rigidity galactic cosmic rays and the high rigidity components. It was possible to explain this in terms of the diffusion-convection-modulation theory by varying either the diffusion coefficient or the size of the modulation region as a function of time. During the ensuing recovery phase of the solar modulated spectra, at the mid point toward the minimum of the solar activity, new striking features have been observed, and these new observations are discussed.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
    Format: text
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    NASA TECHNICAL REPORTS
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