Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh42b10b&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH42B-10
Other
2109 Discontinuities, 2139 Interplanetary Shocks, 2149 Mhd Waves And Turbulence, 7851 Shock Waves
Scientific paper
In a recent work an accurate technique was presented for the determination of shock normals, and other magnetohydrodynamic parameters, using magnetic field and plasma data from one spacecraft (1). They indicated that the method is valid for a (locally) planar shock surface propagating at constant velocity and using data from one spacecraft. It was noticed that failure often occurs when the shock happens close in time to another magnetohydrodynamic discontinuity. In this paper we estimate shock normals using observations from multiple spacecraft. We present multi-spacecraft analysis for shocks on May 4, 1998 and on September 22, 1999. In the first case it appears that a closely located tangential discontinuity, possibly a leading-edge of an ejecta, is actively responsible for the shock observed a few minutes earlier. In the second case a view of the solar wind conditions at the spacecraft ACE, Wind and IMP-8 indicate that the shock is approaching, and then passing a sector boundary crossing. For these shocks the paper will discuss the observed shock discontinuities in plasma and interplanetary magnetic field data used in the determination of the normal. The shock normal and velocity will be tested for consistency with the shock passage at each spacecraft. We will present the value of the field compression, plasma compression and derived Rankine-Hugoniot shock parameters: normal n, shock velocity Vs, shock normal orientation relative to the upstream magnetic field, shock magnetosonic Mach number. 1. Berdichevsky, D.B., A. Szabo, R.P. Lepping, A.F. Vinas, and F. Mariani, Interplanetary Fast Shocks and Associated Drivers Observed Through the Twenty-Third Solar Minimum by WIND Over Its First 2.5 Years, J. Geophys. Res., 105, 27,289-27,314, 2000.
Berdichevsky Daniel B.
Lazarus Andrew J.
Lepping Ronald P.
Szabo Andras
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