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  • 1
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    Unknown
    An unusual interplanetary event - Encounter with a comet? (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The possibility that the slow rise to a sharp maximum and then decay surrounding a strong current sheet observed in the Venus magnetic field 0.72 AU from the sun was caused by passage of Venus through the wake of an active comet is examined. Data were also gathered by the ISEE 3 satellite magnetometer at 0.99 AU 25 h, 20 min later, a delay corresponding to the transit time for the solar wind. No shock structures bounded the phenomenon. The data indicate the presence of a small body in a much larger field of interaction and the magnetometer, solar wind probe, and electron temperature probe support a behavior similar to a planetary magnetosheath. The observed He structure in interplanetary space ruled out a solar wind source, while consideration of the magnetic equator and magnetic pole suggest that an unknown comet passed through the region between the sun and Venus at a distance where the effects would not be detected at earth.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 305; 612-615
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Solar wind interaction with comets - Lessons from Venus (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Data on the solar wind interaction with Venus are examined for the purpose of comparison with similar processes that may occur in comets. Attention is given to bow shock, magnetosheath, ionopause, ionosphere, and magnetotail of Venus. These features are compared with, respectively, the bow shock, magnetosheath, contact surface, coma, and plasma tail of a comet. It is concluded that observations of the solar wind interaction with Venus should provide new insight into the solar wind interaction with comets.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The Pioneer Venus Orbiter event of February 11, 1982 - Of cometary of solar origin? (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: On February 11, 1982, an unusual cusp-shaped temporal variation in the interplanetary magnetic field was detected by the Pioneer Venus orbiter. While variations of the helium content of the solar wind were detected on the preceding day, these changes had no obvious relationship to the occurrence of the cusp-shaped temporal variation in the IMF on February 11. In fact the solar wind the content was quite nominal on February 11. The magnetic variations were also quite unlike those previously reported to be magnetic clouds. Moreover, the scale size of the disturbance had to be smaller than 4 x 10 to the 6th km and thus of cometary dimensions rather than of dimensions usually found in solar initiated events. Thus, there seems to be no need to alter the original interpretation that the observations of Pioneer Venus on February 11, 1982 were consistent with the passage of a comet close to Venus.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 12; 859-861
    Format: text
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    NASA TECHNICAL REPORTS
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