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  • GEOPHYSICS  (5)
  • Astrophysics
  • Space Sciences (General)
  • 1980-1984  (5)
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Year
  • 1
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    Observations of a free-energy source for intense electrostatic waves (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Significant progress has been made in understanding intense electrostatic waves near the upper hybrid resonance frequency in terms of the theory of multiharmonic cyclotron emission using a classical loss-cone distribution function as a model. Recent observations by Hawkeye 1 and GEOS 1 have verified the existence of loss-cone distributions in association with the intense electrostatic wave events, however, other observations by Hawkeye and ISEE have indicated that loss cones are not always observable during the wave events, and in fact other forms of free energy may also be responsible for the instability. Now, for the first time, a positively sloped feature in the perpendicular distribution function has been uniquely identified with intense electrostatic wave activity. Correspondingly, we suggest that the theory is flexible under substantial modifications of the model distribution function.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 7; May 1980
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Escaping nonthermal continuum radiation (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Gurnett (1975) provided details of the continuum radiation spectrum, separating the lower frequency trapped component from an escaping component at frequencies high enough to propagate freely out of the magnetosphere and into the solar wind. The primary motivation for the present investigation is related to the new ISEE observations which show that the escaping continuum radiation differs from the trapped component in several temporal and spectral characteristics. The observations of escaping nonthermal continuum radiation are considered, taking into account spectral and temporal characteristics of escaping continuum radiation and the source region of escaping continuum radiation. Attention is given to the relationship between escaping and trapped continuum radiation, and the relationship between terrestrial escaping continuum radiation and narrowband Jovian kilometric radiation
    Keywords: GEOPHYSICS
    Type: AD-A104719 , Journal of Geophysical Research; 86; July 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Detailed observations of the source of terrestrial narrowband electromagnetic radiation (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Detailed observations are presented of a region near the terrestrial plasmapause where narrowband electromagnetic radiation (previously called escaping nonthermal continuum radiation) is being generated. These observations show a direct correspondence between the narrowband radio emissions and electron cyclotron harmonic waves near the upper hybrid resonance frequency. In addition, electromagnetic radiation propagating in the Z-mode is observed in the source region which provides an extremely accurate determination of the electron plasma frequency and, hence, density profile of the source region. The data strongly suggest that electrostatic waves and not Cerenkov radiation are the source of the banded radio emissions and define the coupling which must be described by any viable theory.
    Keywords: GEOPHYSICS
    Type: AD-A125949 , Geophysical Research Letters; 9; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Generation of nonthermal continuum radiation in the magnetosphere (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Generation of electromagnetic continuum radiation from electrostatic fluctuations near the upper hybrid resonance frequency has been calculated by using cold plasma theory in an inhomogeneous plasma near the plasmapause. It is shown that both the polarization and the amplitude of electromagnetic radiation are in good quantitative agreement with spacecraft observations for nonthermal continuum radiation.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 87; Dec. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Effects of chemical releases by the STS-3 Orbiter on the ionosphere (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The Plasma Diagnostics Package, flown aboard STS-3 as part of the first Shuttle payload (OSS-1), recorded the effects of various chemical releases from the Orbiter. Changes in the plasma environment was observed during flash evaporator system releases, water dumps and maneuvering thruster operations. During flash evaporator operations, broadband Orbiter-generated electrostatic noise was enhanced and plasma density irregularities were observed to increase by 3 to 30 times with a spectrum which rose steeply and peaked below 6 Hz. In the case of water dumps, background electrostatic noise was enhanced at frequencies below about 3 kHz and suppressed at frequencies above 2 kHz. Thruster activity also stimulated electrostatic noise with a spectrum which peaked at approximately 0.5 kHz. In addition, ions with energies up to 1 keV were seen during some thruster events.
    Keywords: GEOPHYSICS
    Type: NASA-CR-171032 , NAS 1.26:171032 , U-OF-IOWA-84-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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