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  • 1
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    Scientific instrumentation of the Radio-Astronomy-Explorer-2 satellite (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The instrumentation of the RAE-2 spacecraft is described. The instruments include a pair of long travelling-wave antennas, a 37-m dipole, two radiometers making one frequency scan every 144 sec, and two rapid-sampling total-power burst receivers which cover the range from 0.025 to 13.1 MHz in 32 discrete steps. Effects of terrestrial noise on RAE-1 and RAE-2 observations are discussed, and it is noted that RAE-2 is uniquely capable of observing repeated lunar occultations of strong radio sources at very low frequencies. Some observational programs are briefly noted, including observations of the galactic background distribution, measurements of lunar occultations of solar radio bursts, and searches for more radio sources among the planets, galactic objects, and extragalactic sources.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics; 40; 4, Ma; May 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Decameter-wave radio observations of Jupiter during the 1977 apparition (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A catalog of observations of Jupiter's sporadic decameter wavelength radio emissions obtained with the Goddard Space Flight Center Jupiter Monitor Network between June 1977 and May 1978 is presented. Data were collected using the Goddard Space Flight Center station in Greenbelt, MD. and at facilities installed at Orroral Valley (Canberra), Australia and the Nancay Radio Observatory in France. Observations were obtained daily at frequencies of 16.7 and 22.2 MHz using five-element Yagi antennas at each end of a two-element interferometer. Plots of the two dimensional emission occurrence probability distribution are given.
    Keywords: ASTRONOMY
    Type: NASA-TM-84012 , X-695-78-25
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Radio Jupiter after Voyager: An overview of the Planetary Radio Astronomy observations (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Jupiter's low frequency radio emission morphology as observed by the Planetary Radio Astronomy (PRA) instrument onboard the Voyager spacecraft is reviewed. The PRA measurement capabilities and limitations are summarized following over two years of experience with the instrument. As a direct consequence of the PRA spacecraft observations, unprecedented in terms of their sensitivity and frequency coverage, at least three previous unrecognized emission components were discovered: broadband and narrow band kilometric emission and the lesser arc decametric emission. Their properties are reviewed. In addition, the fundamental structure of the decameter and hectometer wavelength emission, which is believed to be almost exclusively in the form of complex but repeating arc structures in the frequency time domain, is described. Dramatic changes in the emission morphology of some components as a function of Sun-Jupiter-spacecraft angle (local time) are described. Finally, the PRA in suit measurements of the Io plasma torus hot to cold electron density and temperature ratios are summarized.
    Keywords: ASTRONOMY
    Type: NASA-TM-80718
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Observations of electron gyroharmonic waves and the structure of the Io torus (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Narrow-banded emissions were observed by the Planetary Radio Astronomy experiment on the Voyager 1 spacecraft as it traversed the Io plasma torus. These waves occur between harmonics of the electron gyrofrequency and are the Jovian analogue of electrostatic emissions observed and theoretically studied for the terrestrial magnetosphere. The observed frequencies always include the component near the upper hybrid resonant frequency, (fuhr) but the distribution of the other observed emissions varies in a systematic way with position in the torus. A refined model of the electron density variation, based on identification of the fuhr line, is included. Spectra of the observed waves are analyzed in terms of the linear instability of an electron distribution function consisting of isotropic cold electrons and hot losscone electrons. The positioning of the observed auxiliary harmonics with respect to fuhr is shown to be an indicator of the cold to hot temperature ratio. It is concluded that this ratio increases systematically by an overall factor of perhaps 4 or 5 between the inner and outer portions of the torus.
    Keywords: ASTRONOMY
    Type: NASA-TM-80696
    Format: application/pdf
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