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  • SOLAR PHYSICS  (6)
  • Lunar and Planetary Exploration
  • 1975-1979  (6)
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Year
  • 1
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    The solar wind interaction with Venus (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Pioneer Venus orbiter reveals that Venus has a well developed bow shock like the Earth's but on that is significantly weaker than the Earth's shock. The location of the bow shock is highly variable, more so than would have been expected for an obstacle of essentially fixed size. The altitude of the ionopause is also highly variable in response to changes in the solar wind. In the ionosphere, the field is often low. However, on some orbits, very large fields are seen as low as 150 km, and on most dayside orbits, thin magnetic structures of flux ropes are observed. At night, large fields are often observed which vary from orbit to orbit. Venus has a much smaller intrinsic magnetic moment than expected from scaling the terrestrial moment.
    Keywords: SOLAR PHYSICS
    Type: ESA Magnetospheric Boundary Layers; p 231-239
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Association of low-frequency waves with suprathermal ions in the upstream solar wind (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations obtained upstream of the earth's bowshock with the LASL/MPI plasma instruments and the UCLA magnetometers on ISEE-1 and 2 have revealed a striking relationship between the presence of low-frequency fluctuations in solar wind density and field strength and the different types of distribution functions of upstream ions. Waves are absent when the ions have the beamlike distribution of the 'reflected' ions. Large-amplitude waves are present only in conjunction with the 'diffuse' ions, which are characterized by flat energy spectra and broad angular distributions. The waves are largely compressive, showing very good correlation between oscillations in magnetic field strength and plasma density.
    Keywords: SOLAR PHYSICS
    Type: Geophysical Research Letters; 6; Mar. 197
    Format: text
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  • 3
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    Structure of a quasi-parallel, quasi-laminar bow shock (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A thick, quasi-parallel bow shock structure was observed with field and particle detectors of both HEOS 1 and OGO 5. The typical magnetic pulsation structure was at least 1 to 2 earth radii thick radially and was accompanied by irregular but distinct plasma distributions characteristic of neither the solar wind nor the magnetosheath. Waves constituting the large pulsations were polarized principally in the plane of the nominal shock, therefore also in the plane perpendicular to the average interplanetary field. A separate interpulsation regime detected between bursts of large amplitude oscillations was similar to the upstream wave region magnetically, but was characterized by disturbed plasma flux and enhanced noise around the ion plasma frequency. The shock structure appeared to be largely of an oblique, whistler type, probably complicated by counterstreaming high energy protons. Evidence for firehose instability-based structure was weak at best and probably negative.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-152658
    Format: application/pdf
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  • 4
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    On the causes of spectral enhancements in solar wind power spectra (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Enhancements in power spectra of the solar-wind ion flux in the frequency neighborhood of 0.5 Hz had been noted by Unti et al. (1973). It was speculated that these were due to convected small-scale density irregularities. In this paper, 54 flux spectra calculated from OGO 5 data are examined. It is seen that the few prominent spectral peaks which occur were not generated by density irregularities, but were due to several different causes, including convected discontinuities and propagating transverse waves. A superposition of many spectra, however, reveals a moderate enhancement at a frequency corresponding to convected features with a correlation length of a proton gyroradius, consistent with the results of Neugebauer (1975).
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 81; Feb. 1
    Format: text
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  • 5
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    Support of the Third Solar Wind conference (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The program of invited talks at the Third Solar Wind Conference is provided, with a table of contents of the proceedings.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-140900 , PUBL-1428-77 , Solar Wind Conf.; Mar 25, 1974 - Mar 29, 1974; Pacific Grove, CA; United States
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  • 6
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    Solar wind and magnetosphere interactions (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The relationship between the magnetosphere and the solar wind is addressed. It is noted that this interface determines how much of the solar plasma and field energy is transferred to the Earth's environment, and that this coupling not only varies in time, responding to major solar disturbances, but also to small changes in solar wind conditions and interplanetary field directions. It is recommended that the conditions of the solar wind and interplanetary medium be continuously monitored, as well as the state of the magnetosphere. Other recommendations include further study of the geomagnetic tail, tests of Pc 3,4 magnetic pulsations as diagnostics of the solar wind, and tests of kilometric radiation as a remote monitor of the auroral electrojet.
    Keywords: SOLAR PHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 346-364
    Format: text
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