Interplanetary Magnetic Clouds Observed by Wind and Helios 1 & 2: Influence of the Magnetic Field Strength on the Stand-off Distance

Details Interplanetary Magnetic Clouds Observed by Wind and Helios 1 & 2: Influence of the Magnetic Field Strength on the Stand-off Distance Interplanetary Magnetic Clouds Observed by Wind and Helios 1 & 2: Influence of the Magnetic Field Strength on the Stand-off Distance

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42a0475l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42A-0475

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2139 Interplanetary Shocks

Scientific paper

We study the extent of the sheath region of interplanetary magnetic clouds over the heliospheric distance range 0.3 - 1.0 AU and, in particular, the effect of the magnetic field on the stand-off distance of the shock which fast magnetic clouds drive. For this study we use data on these ejecta acquired by Wind at 1 AU and the Helios 1 and 2 probes at 0.3 - 1 AU. Modelling the ejecta as straight-cylindrical objects, we first apply a hydrodynamic approximation to obtain the stand-off distance of 50 magnetic clouds as a function of sonic Mach number. In a second step we follow Burlaga (1988) and model magnetic clouds as cylindrical-symmetric, force-free magnetic structures of constant alpha, i.e. a 2-component field, satisfying ∇ B = α B. Least-squares fit of this model to the data then determines several parameters of the model magnetic cloud, such as the total field strength on the axis and the distance the spacecraft passes from the axis of the cylinder. Using this information and comparing the measurements with the hydrodynamic limit of zero B, we derive the effect of the magnetic field on the stand-off distance of the shock. Burlaga, L.F., Magnetic clouds and force-free fields with constant alpha, J. Geophys. Res., 93, 7217, 1988. This work is supported by NASA Living with a Star under grant NAG 5-10883.

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