NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Propagation characteristics of waves upstream and downstream of quasi-parallel shocksThe propagation characteristics of waves upstream and downstream of quasi-parallel shocks are investigated by using 2D hybrid simulations. At low Alfven Mach numbers, M(A) below about 2, the shock is initially associated with upstream phase-standing whistlers. At later times, backstreaming ions excite longer-wavelength whistlers via the right-hand resonant ion/ion instability. These waves propagate along the magnetic field at a group velocity no smaller than the upstream flow speed, so that the waves remain in the upstream region. At higher MA (above about 3), these waves are convected back into the shock, causing its reformation and downstream perturbations. Shock transmitted waves mode-convert into Alfven/ion-cyclotron waves which have a wave vector along the shock normal (pointing upstream) and convect downstream. The 2D simulation results confirm our earlier suggestion that the upstream waves should be field aligned, and that their convection into the downstream is associated with linear mode conversion into the Alfven/ion-cyclotron branch.
Document ID
19930061252
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Krauss-Varban, D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Omidi, N.
(California Univ. San Diego, United States)
Date Acquired
August 16, 2013
Publication Date
June 7, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 11
ISSN: 0094-8276
Subject Category
Plasma Physics
Accession Number
93A45249
Funding Number(s)
CONTRACT_GRANT: NAG5-1492
Distribution Limits
Public
Copyright
Other

Available Downloads

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