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  • LUNAR AND PLANETARY EXPLORATION  (23)
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  • 1
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    Heavy ions in the outer Kronian magnetosphere (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The possible sources of the cold plasma observed in the outer magnetosphere of Saturn are analyzed. On the basis of the O(+)-H charge exchange species-specific loss mechanism, as well as abundance and rate considerations, it is concluded that the dominant heavy ion populating the equatorial outer magnetosphere is that of atomic nitrogen. Possible sources of hot plasma are also discussed, as are the inhibition of corotation by mass loading and the radial variation of composition. It is found that the observed deviations from corotation and current mass loading estimates indicate either a somewhat higher ionospheric conductance than is implied by the UVS and RSS measurements, or an overestimate of mass loading. It is suggested that the plasma gap observed by Voyager 1 outbound may be associated with a composition change.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 88; Feb. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observations of Jupiter's distant magnetotail and wake (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results are presented for Voyager 2 plasma wave and plasma measurements, obtained during mid-1980 to August 1981, which indicate the existence of clear signatures of Jovian nonthermal continuum radiation while the spacecraft was in the general downstream direction from Jupiter up to distances of approximately 4.5 AU. A periodicity indicating some solar wind control was indicated by the increasing magnitude and duration of the events as Voyager 2 approached the nominal aberrated tail position in the spring of 1981. It is found that each event shows characteristics suggestive of electromagnetic radiation trapped within a low-density cavity. Several of the events are characterized by a broad, moderately low density region surrounding a well-defined, very low density core. It is concluded that this series of continuum radiation events is best interpreted as the passage of Voyager 2 through the extended magnototail and wake of Jupiter. In addition, the various allowed tail configurations consistent with the observations are examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AD-A123812 , Journal of Geophysical Research; 87; Dec. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Jupiter tail phenomena upstream from Saturn (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Plasma wave and plasma probe measurements from Voyager 2 for February 1981 suggest the detection of phenomena associated with a well defined Jupiter tail, at a distance of about 6,200 Jovian radii. This is held to imply that the Saturn magnetosphere will be affected by the Jovian tail, and that insight into the physics of Saturn's magnetosphere may be obtained through comparisons of Voyager 1 and 2 data. Among the effects that can be sought in Voyager 2 data are magnetosphere size variations, bow shock location, radio emission strength and trapped radiation belt population.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 292; Aug. 13
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Plasma observations near Saturn - Initial results from Voyager 1 (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Voyager 1 encounter with Saturn and its satellites yielded extensive measurements of magnetospheric low-energy plasma electrons and positive ions, both heavy and light, probably of hydrogen and nitrogen or oxygen. At radial distances between 15 and 7 Saturn radii on the inbound trajectory, the plasma appears to corotate with a velocity within 20% of that theoretically expected for rigid corotation. The Titan data, taken while the moon was inside the Saturn magnetosphere, shows a clear signature characteristic of the interaction between a subsonic corotating magnetospheric plasma and the atmospheric or ionospheric exosphere of Titan.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 212; Apr. 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Time dependent plasma injection by Io (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A two parameter model of time-dependent, flux-tube interchange diffusion is fit to the Voyager 1 plasma data obtained in the Io plasma disk. The interpretation of the parameters required to achieve the fit is that plasma injection increased suddenly and substantially (by more than an order of magnitude) at some time prior to the arrival of Voyager 1 (between 1 and 100 days prior). The injection rate was about 2 x 10 to the (29 plus or minus 1) power ion/sec. At this rate, the centrifugally driven interchange instability dominated outward diffusion, causing the outward diffusion rate to be about a factor of 50 greater than the inward diffusion rate. The material diffusing inward had time to cool by radiation, possibly accounting for the observed temperature drop inside the orbit of Io.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 7; Jan. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Plasma observations of the Alfven wave generated by Io (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The positive ion measurements obtained near Io by the plasma instrument on board Voyager 1 are described. The measurements, which are found to be consistent with the predicted flow field, are seen as lending further support to the Alfven wave interpretation of the Io-associated perturbations.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 86; Sept. 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Ring current impoundment of the Io plasma torus (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A newly discovered feature in the Io plasma formation that may be described as a ramp separating a high-density plasma ledge on its Jupiterward side from the lower-density radially distended Io plasma disc on its anti-Jupiterward side is observed to coincide with a marked inward decrease in the ring current population. The spatial congruency of the counter-directed maximal gradients in both plasma bodies reveals a profound coupling between them. The existence of the ramp requires a local order-of-magnitude reduction in the diffusion coefficient that governs radial mass transport. It is demonstrated that the diminished diffusive efficiency there is caused by strong pressure gradient inhibition of the interchange instability that underlies mass transport. The Io plasma torus, which is defined as the region of strong ultraviolet emissions, is identified as the plasma ledge. The plasma density in the ledge is high and, incidentally therefore, able to emit strongly because it is impounded against rapid, centrifugal expulsion by the inwardly directed pressure of the ring current at its inner edge.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 86; Sept. 30
    Format: text
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  • 8
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    Direct plasma measurements in the Io torus and inner magnetosphere of Jupiter (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The details of positive ion measurements made in the inner magnetosphere are discussed. Attention is also given to an analysis of these measurements to obtain plasma composition, flow speeds, and temperatures and to the assumptions made in the analysis. These results for the positive ions are then combined with the direct measurements of plasma electrons between 5.7 and 9 Jupiter radii and with a theoretical distribution of plasma along dipolar magnetic field lines to build a two-dimensional model of the plasma torus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 86; Sept. 30
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    NASA TECHNICAL REPORTS
  • 9
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    Voyager observations of Jupiter's distant magnetotail (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Observations of locally trapped nonthermal continuum radiation and distant encounters with the Jovian magnetotail are reported. An attempt is made to deduce information on the morphology of the distant tail of Jupiter. It is noted that the observations of continuum radiation trapped in low-density regions of the solar wind suggest that Voyager may at times be connected to the distant tail by a low-density trough which acts as a wave guide and allows radiation from the tail to reach the spacecraft.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AD-A107126 , Journal of Geophysical Research; 86; Sept. 30
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    NASA TECHNICAL REPORTS
  • 10
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    Structure and other properties of Jupiter's distant magnetotail (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Analyses of data from Voyager 2 experiments provide evidence for, and characteristics of, a Jovian magnetotail extending at least to 9,000 Jovian radii from the planet. During approximately (25 day) periodic sightings of the tail, the magnetic field tended to point radially towards or away from Jupiter, indicating preservation to large distances of the bipolar, lobe like structure observed near the planet. This periodicity, along with various properties of the solar wind at this time, indicates that the tail is apparently influenced by recurrent solar wind features. Anomalous magnetic fields, not aligned with the nominal tail axis, also exist within the tail, especially in the low density, central (core) region, indicating some complexity of internal structure.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-85054 , NAS 1.15:85054 , MIT-CSR-P-83-1
    Format: application/pdf
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