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  • 1
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    Origin of strong magnetic fields. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A possible mechanism by which extremely strong magnetic fields in neutron stars and white dwarfs could originate involves the existence of thermodynamic equilibrium states (LOFER states) of an electron gas. The essence of the stability theory of a LOFER state is discussed. The extended electronic system considered is in contact with a thermal bath in the presence of an external magnetic field. It is found that it is not necessary to require absolute stability in order to realize a LOFER state in nature.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 235; Jan. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mercury's atmosphere from Mariner 10 - Preliminary results (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Analysis of data obtained by the ultraviolet experiment on Mariner 10 indicates that Mercury is surrounded by a thin atmosphere consisting in part of helium. The partial pressure of helium at the terminator is about 5 trillionths of a millibar. The total surface pressure of the atmosphere is less than about 2 billionths of a millibar. Upper limits are set for the abundance of various gases, including hydrogen, oxygen, carbon, argon, neon, and xenon. The wavelength dependence of Mercury's surface albedo is similar to that of the moon over a broad range of wavelengths from 500 to 1600 A. Strong signals were recorded by the airglow instrument as Mariner 10 passed through the cavity behind Mercury. They are as yet unexplained but may provide information on the properties of the local plasma.
    Keywords: SPACE SCIENCES
    Type: Science; 185; July 12
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Ultraviolet observations of Venus from Mariner 10 - Preliminary results (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An objective grating spectrometer on Mariner 10 has measured airglow in the wavelength range 200 to 1700 angstroms. The data reveal the presence of significant concentrations of hydrogen, helium, carbon, and oxygen atoms in the upper atmosphere of Venus. A preliminary analysis of the hydrogen data indicates an exospheric temperature of 400 K. There is evidence for intense airglow emission at wavelengths longward of 1350 angstroms; the nature of this emission is unclear, but the radiation is spatially extensive and detectable on both day and night sides of the planet.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Mar. 29
    Format: text
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  • 4
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    Observations of He I 584 A nighttime radiation - Evidence for an interstellar source of neutral helium (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The intensity and spatial variations of the He I 584 A radiation in the night sky were measured to an altitude of 264 km from a sounding rocket launched from Thumba, India. The flux varied in intensity with look angle from a high of 16 plus or minus 5 rayleighs to a low of less than 1 rayleigh. The data obtained are presented in the form of an all-sky map. Since the peak flux levels observed are approximately two orders of magnitude larger than that expected from geocoronal resonant scattering, we have compared our results with those expected from two interplanetary sources of neutral helium: the penetration of the local interstellar medium into the solar neighborhood and the dust deionization of solar-wind alpha particles. The dust deionization-model predictions using currently accepted input parameters appear to be inconsistent with the observations. The interstellar helium source is compatible with the data to within the uncertainties of the models.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 187; Feb. 1
    Format: text
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