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  • General Chemistry  (873)
  • Cell & Developmental Biology  (317)
  • SOLAR PHYSICS
  • 1975-1979  (1,406)
  • 1977  (1,406)
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  • 1975-1979  (1,406)
Year
  • 1
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    Studies of the sun from Skylab (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The new and exciting contributions to solar physics, which are resulting from the NASA Skylab Program, are reviewed and their broader implications in terms of solar cycle and solar-terrestrial relations are discussed. Among the 'active' phenomena studied by the Skylab Apollo Telescope Mount (ATM) solar experiments are coronal bright points, active regions, flares and coronal transient events. One of the most interesting quiet features studied by ATM has been coronal holes. The results of the first Skylab Solar Workshop, which was dedicated to a detailed investigation of these features and of their relationship with the solar wind, are also presented.
    Keywords: SOLAR PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Extreme-ultraviolet observations of coronal holes. I - Locations, sizes and evolution of coronal holes, June 1973-January 1974 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The disk boundaries of coronal holes have been systematically determined from XUV observations taken during the manned Skylab missions (June 1973-January 1974). The resulting atlas was used to find the sizes, global distributions, differential rotation rates, growth/decay rates and lifetimes of holes during this period. The polar cap holes together covered 15% of the sun's total surface area, a number which remained surprisingly constant throughout Skylab despite the fact that each pole was independently evolving in time. Lower latitude holes contributed another 2 to 5%.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 51; Mar. 197
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  • 3
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    Evolution pattern of the exploding granules (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observational features of exploding granules that may be of some importance for the theory of unsteady convection are discussed on the basis of a time sequence of high-definition photographs of the solar granulation obtained during a Stratoscope flight. The evolutionary pattern of exploding granules is summarized schematically, and several characteristic features are derived from a study of seven such granules. The exploding-granule phenomenon is interpreted qualitatively in terms of cooling at the photospheric level and the subsequent sinking of cold matter at the center of a granule due to loss of buoyancy
    Keywords: SOLAR PHYSICS
    Type: Colloquium on Problems of stellar convection; Aug 16, 1976 - Aug 20, 1976; Nice; France
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    NASA TECHNICAL REPORTS
  • 4
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    High-precision infrared sky survey at wavelength 2.7 microns (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preliminary results of an infrared survey of the equatorial sky zone (declinations 10 S to 10 N) with U.S. Air Force satellite sensors show that positions of previously unknown infrared sources are measured with an rms accuracy of 4 arc seconds, which is six times better than the best previous infrared survey. The search area per source for further study is thus 36 times smaller, so that identification of the infrared sources with optical objects in catalogs and sky photographs is facilitated, as is reacquisition of the sources with ground-based infrared telescopes. The survey extends the content of near-infrared source catalogs to lower flux densities and adds information at a wavelength not observable from the ground. Objects found in the survey include cool giants and supergiants, long-period and semi-regular variable stars, and sources identified with faint red stars visible on the Palomar Observatory Sky Survey.
    Keywords: SOLAR PHYSICS
    Type: Modern utilization of infrared technology III: Civilian and military; Third Seminar; Aug 25, 1977 - Aug 26, 1977; San Diego, CA
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  • 5
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    Solar energetic particles below 10 MeV (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The information on solar acceleration and coronal propagation contained in low energy solar particle observations must be extracted from the effects of propagation in a dynamic interplanetary medium and the proximity of the earth's magnetosphere. The resulting separation reveals long-lived coronal injection and strong spatial ordering of coronal propagation.
    Keywords: SOLAR PHYSICS
    Type: L. D. de Feiter Memorial Symposium; Jun 07, 1977 - Jun 10, 1977; Tel Aviv; Israel
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  • 6
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    Evolution of the X-ray emitting corona preceding and after major solar events (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Soft X-ray emission from the sun during STIP Interval II, observed with the Lockheed Mapping X-ray Heliometer on the NASA OSO-8 satellite, is presented. In examining the emission versus time for extended intervals around the times of the Class 1B flare on March 28, 1976, and the Class 1B flare on April 30, 1976, we find significantly more low level flare activity prior to the major flares than after. Twelve modest X-ray bursts are investigated and no compelling case of a preflare brightening phase is observed. Preliminary correlations with the time history of emitted solar particles are discussed.
    Keywords: SOLAR PHYSICS
    Type: Plenary Meeting; Jun 07, 1977 - Jun 18, 1977; Tel Aviv; Israel
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  • 7
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    Mass ejections from the solar corona into interplanetary space (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results obtained from analysis of Skylab coronagraph images of mass ejections from the solar corona are reviewed which demonstrate the importance of mass-ejection coronal transients to the interplanetary medium and which support the belief that magnetic forces are the primary mechanism driving mass ejections from the corona. Observations of 13 large ejection events are examined which indicate that coronal mass ejections contribute a nonnegligible fraction of the mass flux from the sun, especially toward the heliographic equator near the maximum of a solar activity cycle. It is shown that observed loop-shaped transients were associated with regions of increased magnetic field and with separations of unipolar field regions, that the forces driving the transients outward acted to great heights long after the onsets of the events, and that the behavior of the ejecta was magnetically controlled. It is concluded that mass ejections from the corona contributed at least 3% of the mass flux from the sun during the Skylab era and that the most common loop-shaped ejections are magnetically driven through the corona.
    Keywords: SOLAR PHYSICS
    Type: Plenary Meeting; Jun 07, 1977 - Jun 18, 1977; Tel Aviv; Israel
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  • 8
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    Application of an axisymmetric implicit blunt body procedure - Computation of solar wind flows past terrestrial planets (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A recently developed axisymmetric implicit unsteady Euler equation solver has been applied to the calculation of solar wind flows past terrestrial planets. The primary emphasis of this paper is on the application of that computational technique to the calculation of the flow field properties of steady, axisymmetric, supersonic/hypersonic flows past blunt-nosed shapes characteristic of interplanetary solar wind flows past both magnetic and nonmagnetic planets. The purpose is to demonstrate both the accuracy and flexibility of this new technique as well as to present a novel application of such supersonic blunt-body procedures.
    Keywords: SOLAR PHYSICS
    Type: AIAA PAPER 77-700 , Conference on Fluid and Plasmadynamics; Jun 27, 1977 - Jun 29, 1977; Albuquerque, NM
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  • 9
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    The calculation of theoretical chromospheric models and predicted OSO I spectra (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A computer program was developed which, given a line list and a model atmosphere, computes a solar ultraviolet spectrum, broadens it, plots it together with an observed spectrum, and labels each line. An iterative procedure is utilized. Several of the computed and observed spectra are presented.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-149816 , SAR-3
    Format: application/pdf
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  • 10
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    Wave-particle interaction phenomena associated with shocks in the solar wind (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Microscopic wave-particle interaction phenomena must generally affect the evolution of a traveling interplanetary discontinuity such as a collisionless shock, and solar wind plasma instabilities should also be associated with interplanetary acceleration, diffusion, and dissipation. Recent local measurements from diagnostics on widely separated spacecraft illustrate some examples of these interaction phenomena, and two bounding cases are considered in detail here. It is shown that the interplanetary shock of September 14, 1974 (detected on IMP-7, 8, Hawkeye-1, and Pioneer 11) was associated with intense local electrostatic noise and ion acceleration, while the shock of January 6, 1975 (detected on IMP-7 and Helios-1) had no detectable electrostatic turbulence.
    Keywords: SOLAR PHYSICS
    Type: L. D. de Feiter Memorial Symposium; Jun 07, 1977 - Jun 10, 1977; Tel Aviv; Israel
    Format: text
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