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Title:
Interplanetary gas. XXIV - Are cometary plasma tail disconnections caused by sector boundary crossings or by encounters with high-speed streams
Authors:
Niedner, M. B., Jr.; Brandt, J. C.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt; Systems and Applied Sciences Corp., Riverdale, Md.), AB(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 723-732. (ApJ Homepage)
Publication Date:
12/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Models, Comet Tails, Cosmic Plasma, Interplanetary Gas, Magnetohydrodynamic Flow, Comet Heads, Flow Velocity, High Speed, Morphology, Pioneer 11 Space Probe, Solar Cycles, Solar Wind
DOI:
10.1086/157549
Bibliographic Code:
1979ApJ...234..723N

Abstract

The paper discusses and compares the original sector boundary model (Niedner and Brandt) and the alternative high-speed stream model (Ip and Mendis) suggested for explaining cometary plasma tail disconnection events (DE) within a largely observational framework not dependent on detailed plasma physics. Among the findings are: (1) the strong solar cycle phase dependence of the amplitude of the Rosenberg-Coleman effect (Svalgaard and Wilcox) yields inferred maximum latitudes of all of the DEs in the original survey to a one-time Rosenberg-Coleman effect measurement made by Pioneer 11, which indicated a disappearance of sectors above 16 deg latitude, and (2) approximately 70% of the post 1926 DEs in the expanded survey show a close association with corotated shorter-term polarity reversals. This result is difficult to reconcile with the predictions of the stream model, in which DEs should correlate more strongly with streams than with sector boundaries. It is concluded that the sector boundary model better describes the disconnection phenomenon and that the use of DEs as unique sector boundary markers is presently justified.

Associated Articles

Part  1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10     Part 12     Part 11     Part 13     Part 14     Part 15     Part 16     Part 17     Part 19     Part 18     Part 20     Part 21     Part 22     Part 23     Part 24    


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