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  • SOLAR PHYSICS  (526)
  • 2000-2004
  • 1980-1984  (310)
  • 1975-1979  (216)
  • 1983  (310)
  • 1977  (216)
  • 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
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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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    NASA TECHNICAL REPORTS
  • 3
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    Structure and physics of solar faculae. III - The densities in the chromosphere-corona transition zone (1983)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 83; Feb. 198
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    NASA TECHNICAL REPORTS
  • 4
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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
  • 5
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    An investigation of coronal active region loop structures using AS&E rocket X-ray images (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Simultaneous high spatial resolution observations at 6 cm in soft X-rays, in photospheric magnetograms, and in optical filtergrams were used to compare the most intense sources of centimetric emission in two active regions to coronal loops, sunspots, chromospheric structures, and photospheric magnetic fields. Results show that the majority of the bright microwave components are not associated with sunspots or X-ray emission. A nonthermal mechanism appears necessary to explain the brightest microwave components, discrete regions of continuous particle acceleration may be common in active regions. Studies of the plasma parameters of selected loops imply that the radio emission is consistent with gyro-resonance absorption at the third and fourth harmonic, at least from part of each loop. Results are presented for: (1) X-ray and microwave observations of active regions; (2) comparison of coronal holes observed in soft X-rays and Hel 10830 A spectrosheliograms; and (3) the reappearance of polar coronal holes and the evolution of the solar magnetic field.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-170284 , NAS 1.26:170284 , ASE-4792
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  • 6
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    Coronal and chromospheric physics (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Achievements and completed results are discussed for investigations covering solar activity during the solar maximum mission and the solar maximum year; other studies of solar activity and variability; infrared and submillimeter photometry; solar-related atomic physics; coronal and transition region studies; prominence research; chromospheric research in quiet and active regions; solar dynamics; eclipse studies; and polarimetry and magnetic field measurements. Contributions were also made in defining the photometric filterograph instrument for the solar optical telescope, designing the combined filter spectrograph, and in expressing the scientific aims and implementation of the solar corona diagnostic mission.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-170295 , NAS 1.26:170295
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  • 7
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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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    NASA TECHNICAL REPORTS
  • 8
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    Gamma-ray lines and neutrons from solar flares (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The energy spectrum of accelerated protons and nuclei at the site of a limb flare was derived by a technique, using observations of the time dependent flux of high energy neutrons at the Earth. This energy spectrum is very similar to the energy spectra of 7 disk flares for which the accelerated particle spectra was previously derived using observations of 4 to 7 MeV to 2.223 MeV fluence ratios. The implied spectra for all of these flares are too steep to produce any significant amount of radiation from pi meson decay. It is suggested that the observed 10 MeV gamma rays from the flare are bremsstrahlung of relativistic electrons.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-84968 , NAS 1.15:84968 , US-Japan Symp.; Oct 01, 1982
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  • 9
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    Solar energetic particles below 10 MeV (1977)
    In:  Other Sources
    Details
    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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  • 10
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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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