NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Termination shock response to large-scale solar wind fluctuationsThe analysis of data recorded by the Voyager 2 spacecraft indicates the presence of large-scale fluctuations in the solar wind ram pressure on the time scale of tens of days. The amplitude of the fluctuations is highly variable but often lies within a factor of 5 to 10 change from an average or mean value of the ram pressure. Since the spacecraft has presumably not encountered the termination shock yet, these fluctuations should eventually interact with the shock and thereby play a role in determining the shock location. Numerical solutions of the time-dependent gasdynamic equations are used to simulate the response of the termination shock to fluctuations in the solar wind ram pressure comparable to those observed. The primary result of this study is that the maximum shock excursion due to the fluctuations is of the order of 1 AU, which is much smaller than that predicted by other studies. Additional simulations show that the limited movement is due to the fact that the time scale for the termination shock response is substantially larger than the time scale of the fluctuations. It is also shown that the heliopause acts as a barrier for the fluctuations and confines them to the heliosphere.
Document ID
19950046288
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Steinolfson, R. S.
(Southwest Research Institute, San Antonio, TX United States)
Date Acquired
August 16, 2013
Publication Date
January 7, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: A7
ISSN: 0148-0227
Subject Category
Solar Physics
Accession Number
95A77887
Funding Number(s)
CONTRACT_GRANT: NAGW-2621
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available