NTRS - NASA Technical Reports Server

Back to Results
Plasmas in the outer heliosphereWe review the observed properties of the solar wind in the outer heliosphere, including observations from Voyager and the Pioneers, as well as from inner heliospheric probes as appropriate. These observations are crucial to modeling of the heliosphere and its interactions with the interstellar medium, since the wind ram pressure and its temporal variations are important in understanding the distance to the termination shock and heliopause and how those boundaries might vary in time. We focus on results since Solar Wind 7. Among the issues we will discuss are: (1) the time scales for and statistical properties of variations in the ram pressure in the outer heliosphere, and how those variations might affect the morphology of the heliospheric/interstellar medium interface; (2) the question of possible solar wind slowing in the outer heliosphere due to the pick-up of interstellar ions; (3) the issue of whether there is bulk heating of the solar wind associated either with interstellar ion pick-up or with continued heating due to stream-stream interactions; (4) evidence for latitudinal variations in solar wind properties; and (5) the 1.3 year periodicities apparent in the outer heliosphere, and the close correspondence with similar variations seen with inner heliospheric probes.
Document ID
Document Type
Conference Paper
Belcher, J. W. (Massachusetts Inst. of Tech. Cambridge, MA United States)
Richardson, J. D. (Massachusetts Inst. of Tech. Cambridge, MA United States)
Lazarus, A. J. (Massachusetts Inst. of Tech. Cambridge, MA United States)
Gazis, P. R. (San Jose State Univ. Moffett Field, CA United States)
Barnes, A. (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 17, 2013
Publication Date
June 30, 1995
Publication Information
Publication: International Solar Wind 8 Conference
Subject Category
Solar Physics
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.