Multiple spacecraft observations of interplanetary shocks: Characteristics of the upstream ULF turbulence

Details Multiple spacecraft observations of interplanetary shocks: Characteristics of the upstream ULF turbulence Multiple spacecraft observations of interplanetary shocks: Characteristics of the upstream ULF turbulence

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983nascp.2280.385r&link_type=abstract

In JPL Solar Wind Five p 385-400 (SEE N84-13067 03-92)

Physics

4

Coplanarity, Interplanetary Space, Shock Waves, Wave Propagation, Whistlers, Cosmic Rays, Flow Velocity, Mach Number, Magnetic Fields, Power Spectra, Turbulence

Scientific paper

All interplanetary shocks observed by ISEE-3 and either ISEE-1 or ISEE-2 or both in 1978 and 1979 are examined for evidence of upstream waves. In order to characterize the properties of these shocks it is necessary to determine accurate shock normals. An overdetermined set of equations were inverted to obtain shock normals, velocities and error estimates for all these shocks. Tests of the method indicate it is quite reliable. Using these normals the Mach number and angle were between the interplanetary magnetic field and the shock normal for each shock. The upstream waves were separated into two classes: whistler mode precursors which occur at low Mach numbers and upstream turbulence whose amplitude at Mach numbers greater than 1.5 is controlled by the angle of the field to the shock normal. The former waves are right hand circularly polarized and quite monochromatic. The latter waves are more linearly polarized and have a broadband featureless spectrum.

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