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  • Other Sources  (1,577)
  • SOLAR PHYSICS  (1,577)
  • 1985-1989  (1,577)
  • 1
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    Unmasking the Sun (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This videotape describes solar-related research at the Mt. Palomar Observatory.
    Keywords: SOLAR PHYSICS
    Type: ASR-248 , NASA-TM-109595 , NONP-NASA-VT-93-190393
    Format: text
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  • 2
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    Solar physics in the space age (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A concise and brief review is given of the solar physics' domain, and how its study has been affected by NASA Space programs which have enabled space based observations. The observations have greatly increased the knowledge of solar physics by proving some theories and challenging others. Many questions remain unanswered. To exploit coming opportunities like the Space Station, solar physics must continue its advances in instrument development, observational techniques, and basic theory. Even with the Advance Solar Observatory, other space based observation will still be required for the sure to be ensuing questions.
    Keywords: SOLAR PHYSICS
    Type: NASA-NP-106 , NAS 1.83:106
    Format: application/pdf
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  • 3
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    Formation of a compound stream between 0.85 AU and 6.2 AU and its effects on solar energetic particles and galactic cosmic rays (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This paper describes the formation of a compound stream as a result of the interaction and coalescence of a series of five streams (a slow transient stream, two corotating streams, and two exceptionally fast transient streams) observed by the Helios B (HB) satellite near 0.85 AU. The compound stream and two merged interaction regions were also observed by the Voyager 1 satellite near 6.2 AU when it was nearly radially aligned with the HB. Closely associated with this compound stream was one of the largest solar energetic particle events observed beyond 5 AU. The relationship of this compound stream and its magnetic fields to the intensity profiles of solar energetic particles and galactic cosmic rays is discussed.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 13331-13
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  • 4
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    Solar system exploration (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The goal of planetary exploration is to understand the nature and development of the planets, as illustrated by pictures from the first two decades of spacecraft missions and by the imaginations of space artists. Planets, comets, asteroids, and moons are studied to discover the reasons for their similarities and differences and to find clues that contain information about the primordial process of planet origins. The scientific goals established by the National Academy of Sciences as the foundation of NASA's Solar System Exploration Program are covered: to determine the nature of the planetary system, to understand its origin and evolution, the development of life on Earth, and the principles that shape present day Earth.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-101784 , NAS 1.15:101784
    Format: application/pdf
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  • 5
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    Anticipated scientific return of the Advanced Solar Observatory (1985)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The scientific importance of the Advanced Solar Observatory (ASO) is discussed with emphasis on its soft X-ray, XUV, and EUV facilities. The principal achievement expected from the ASO's SXR/XUV and EUV telescope is a greatly improved resolution of the magnetic structure and activity in the transition region and corona. Observations from these facilities, combined with complementary observations of the photosphere and chromosphere from Solar Optical Telescope and of the higher corona from the Pinhole/Occulter Facility, are expectecd to yield significant advances in all major areas of solar physics concerning the causes and effects of solar magnetic fields.
    Keywords: SOLAR PHYSICS
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  • 6
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    The composition of solar energetic particles (1986)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The present measurements of elemental abundances in 15 large solar energetic particle events confirm the existence of two major effects: systematic differences between solar energetic particle abundances and photospheric abundances that are approximately correlated with first ionization potential (implying that the solar corona is the likely source population for these particles), and an enhancement of heavy ion abundances relative to a baseline of solar energetic particle abundances whose magnitude increases with rising atomic number. These data suggest the possibility that the degree of heavy ion enhancement has some correlation with spectral slope, and confirm that the aforementioned effects are not due to time or energy variations within individual events. The maximum column density above the solar acceleration region is less than 0.1 g/sq cm, on the basis of these data.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 301; 938-961
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  • 7
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    International solar-terrestrial physics program: A plan for the core spaceflight missions (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This brochure has been prepared by NASA on behalf of the European Space Agency (ESA), the Institute of Space and Astronautical Science (Japan) (ISAS), and the U.S. National Aeronautics and Space Administration (NASA) to describe the scope of the science problems to be investigated and the mission plan for the core International Solar-Terrestrial Physics (ISTP) Program. This information is intended to stimulate discussions and plans for the comprehensive worldwide ISTP Program. The plan for the study of the solar - terrestrial system is included. The Sun, geospace, and Sun-Earth interaction is discussed as is solar dynamics and the origins of solar winds.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-87511 , NAS 1.15:87511
    Format: application/pdf
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  • 8
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    Helios 1 energetic particle observations of the solar gamma-ray/neutron flare events of 1982 June 3 and 1980 June 21 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The characteristics of the energetic particles associated with the solar gamma-ray/neutron flare events of June 3, 1982 and June 21, 1980 observed by the Goddard cosmic-ray experiment on Helios 1 (at heliocentric distances of 0.57 and 0.54 AU, respectively) differ in several important respects from typical sonar particle increases. In particular, the June 3, 1982 event has a proton energy spectrum which fits a remarkable flat power law in kinetic energy with a spectral index of 1.2, an electron/proton ratio of 1 at 4 MeV, and a small but well-defined precursor event that began some 3 hr before the impulsive flare increase. Similar energetic particle precursors were observed for the gamma-ray associated 1980 June 21 and June 7 flare events. At energies less than about 40 MeV, the particle onset time measured for the June 3, 1982 event is anomalous, suggesting that these lower energy particles may have been released at the sun about 1-2 minutes before the higher energy particles.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 290; L67-L71
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  • 9
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    Soft X-ray, microwave, and hard X-ray emission from a solar flare - Implications for electron heating and acceleration in current channels (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The soft X-ray, microwave, and hard X-ray emissions from the solar flare of May 14, 1980 are studied. The flare consists of a gradual component in soft X-rays and microwaves and a superposed impulsive burst accompanied by hard X-ray emission. The impulsive phase of the flare appears in the soft X-ray emission as a temperature spike and as an increased rate of energy dissipation into the plasma. A new, spatially and spectrally distinct, microwave component appears during the impulsive burst. The data are interpreted in terms of Joule heating and the electric field acceleration of electrons in one or more current sheets. It is found that all three emissions can be generated with sub-Dreicer electric fields. The soft X-ray emitting plasma can be heated by a single current sheet only if the resistivity in the sheet is well above the classical, collisional resistivity. Conditions are also given for the hard X-ray emission to be from nonthermal electrons with classical resistivity.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 345; 1050-105
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  • 10
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    The regimes of the east-west and the radial anisotropies of cosmic rays in the heliosphere (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Observations dating back to 1957 are used to show that there are two distinct physical states of the heliosphere. From 1957-1970 the diurnal anisotropy consisted of the azimuthal component only. This period is defined as the regime of the east-west anisotropy. The period 1971-1979 is characterized by the appearance of a radial anisotropy which attained a maximum amplitude in 1976, when the solar activity was minimum. It is suggested that there is an inverse correlation between the amplitude of the radial anisotropy and solar activity. The physical state of the heliosphere is very stable during the regime of east-west anisotropy and extremely dynamic during the radial anisotropy regime. It is suggested that the heliosphere switches from one physical state to another following the onset of the solar polar field reversal.
    Keywords: SOLAR PHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 36; 1451-145
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