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  • ASTROPHYSICS  (2)
  • 1985-1989  (2)
  • 1
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    Long-period dynamic spectrograms of low-frequency interplanetary radio emissions (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Dynamic spectrograms of the low-frequency interplanetary radio emissions as observed by Voyagers 1 and 2 from 1983 through mid-1986 are reported. The radio emissions were observed to be most intense in the latter portion of 1983 at 3 kHz but have also been detected at 2 kHz. The emission has been present almost continuously at either 2 or 3 kHz since late 1983. The spectrograms presented herein show that the phenomenon appears almost identically as observed by the two spacecraft separated by more than 10 AU, at least at the higher frequency. One feature revealed by the dynamic spectrograms which had not been noticed previously is a gradual rise in frequency of the 3-kHz component following the onset of the late 1983 event. These new observations reinforce the conclusion that the low-frequency emissions are freely propagating radio waves, but the two-component spectral structure implies that the previous model of emission at twice the plasma frequency at the inner heliosphere shock is inadequate to fully account for the observations. Either an additional source region or an additional source mechanism is suggested.
    Keywords: ASTROPHYSICS
    Type: AD-A179102 , Geophysical Research Letters (ISSN 0094-8276); 14; 49-52
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Recent observations of the very low frequency interplanetary radio emission (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of radio emissions in the frequency range of 2 to 3 kHz have been made in the distant heliosphere by the Voyager 1 and 2 plasma wave instruments. Based primarily on wideband observations made periodically throughout the cruise phases of the missions the radio emission, first observed in 1982, appears to have been present almost continuously since 1983. The spectrum is complex, usually showing two peaks, one near 2 and another near 3 kHz. Occasionally, only one of the peaks is observed. A possible source for the radio emissions is the terminal shock in the outer heliosphere.
    Keywords: ASTROPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 6; 1 19
    Format: text
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    NASA TECHNICAL REPORTS
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