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  • Other Sources  (111)
  • SOLAR PHYSICS
  • 1970-1974  (111)
Collection
  • Other Sources  (111)
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Year
  • 1
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    Low-energy protons of solar origin and investigation of the interplanetary medium (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Experimental data on low energy solar protons are presented. A phenomenological classification of the fluxes of these particles is suggested. Contemporary model conceptions of the propagation of low energy proton fluxes are examined, along with information that has been obtained on the properties of the interplanetary medium from study of solar proton fluxes.
    Keywords: SOLAR PHYSICS
    Type: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 175-202
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The internal structure of the convective envelope of the sun (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: An axisymmetric hydrodynamic model of the sun consisting of a core at radiant equilibrium and a convective envelope is studied with consideration of gravitational forces, rotation, turbulence effects, and electromagnetic forces. The dimensionless parameters that control the equations of plasma motion within the sun and the boundary conditions are investigated; estimates are given for these parameters on the basis of experimental data and the existing theoretical models. Stability conditions are derived for convective equilibrium, developed cellular convection, and developed turbulent convection with consideration of rotation and turbulent Reynolds stresses. These conditions characterize the possible physical state of the matter in the convective envelope. Using estimates of the dimensionless parameters and models of some of them, a method of successive approximations is proposed for solution of the problem as a whole.
    Keywords: SOLAR PHYSICS
    Type: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 124-150
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetic measurements in model experiments (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Plasma parameters for modeling of the interaction between the solar wind and the earth's magnetic field are selected on the limited modeling principle (plasma velocity 3 x 10 to the 7th power cm/sec, density 10 to the 13th power cm/3, electron temperature approximately 15 eV). Measurements were made with magnetic probes capable of developing all 3 components inside the magnetic field. The resulting magnetic field charts indicate that a neutral layer forms on the night side in the model experiments. A magnetosphere free of plasma streams is established on the daytime side. A shock wave forms on the boundary of the magnetosphere, its width c/omega sub 0 in accordance with theory, where omega sub 0 is the total Langmuir width.
    Keywords: SOLAR PHYSICS
    Type: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 45-58
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    NASA TECHNICAL REPORTS
  • 4
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    Solar neutrinos and the influence of radiative opacities on solar models (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; 194; Dec. 15
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  • 5
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    Observation of sectored structure in the outer solar corona - Correlation with interplanetary magnetic field (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Review of the daily images of the white light corona between 3 and 10 solar radii recorded by a coronagraph aboard the OSO-7 unmanned satellite since October 3, 1971. The observed sectored structure in the outer solar corona is discussed and correlated with the interplanetary magnetic field. The correlations support the observation of Hansen et al. (1973).
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 37; Aug. 197
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  • 6
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    Polarization results of solar X-rays from OSO-7 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Polarization measurements of solar X-ray events that were obtained with an instrument on OSO-7 are presented. The results appear to be consistent with the results of Tindo et al. on the existence and magnitudes of polarization. A comparison with polarization predictions when X-rays are produced by radial beams of electrons gives two examples of deviations from such a model.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 37; Aug. 197
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  • 7
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    Magnetoacoustic instability and termination of solar wind (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Stability of a system composed of two interstreaming plasmas in the presence of a transverse magnetic field is investigated, and the theory is applied to solar-wind interaction with interplanetary gas. The system is susceptible to magnetoacoustic instability provided the ratio of densities of solar-wind protons to interplanetary protons is below a critical value. The turbulence produced by this instability will reduce the solar-wind speeds to subsonic values. This transition for the solar wind occurs at heliocentric distances between 5 and 20 AU.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; 192; Sept. 15
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  • 8
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    Limb-brightening observations from the OSO-7 satellite. I - Electron density and temperature of the non-equatorial corona from EUV lines of Fe XIV and other Fe ions (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SOLAR PHYSICS
    Type: Astronomy and Astrophysics; 37; 2, De; Dec. 197
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    NASA TECHNICAL REPORTS
  • 9
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    Non-LTE H2+ as the source of missing opacity in the solar atmosphere (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The population of the various vibrational levels of the H2+ molecule has been calculated from the consideration of formation and destruction mechanisms. The resulting population is used in calculating the total absorption due to H2+ and is compared with the other known sources of opacity at several optical depths of the solar atmosphere. It is shown that the absorption due to H2+ can probably account for the missing ultraviolet opacity in the solar atmosphere.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; 194; Dec. 15
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  • 10
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    Long-term variations of the solar wind proton parameters (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Interplanetary plasma data taken near 1 AU by a variety of spacecraft (Imp 1, Vela 2-4, Explorer 33-35, and Heos 1) from 1963 to 1971 are used to study the long-term variations of the solar wind proton properties. An intercalibration among the different experiments is performed in order to obtain a coherent set of data. The most interesting result is a 40% reduction of the proton density between the minimum and the maximum of the solar activity cycle. The observed density variation occurs throughout the velocity range; however, a limited sample of data could suggest that at very low velocities (below 300 km/sec) the density is independent of the solar activity. The proton bulk velocity is remarkably constant during the period considered; small increases of the average speed occurring in 1968 and 1971 cannot be attributed to the solar cycle. No clear trend is exhibited by the proton temperature; differences among the various experiments probably have an instrumental origin.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 79; Dec. 1
    Format: text
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