The deceleration of the solar wind and the intensity of the interplanetary magnetic field in the distant heliosphere

A. V. Usmanov, M. L. Goldstein, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA

The energy and momentum redistribution between solar-wind and pickup protons causes a deceleration of the solar wind in the distant heliosphere. Using a three-dimensional magnetohydrodynamic solar wind model that accounts for charge exchange with interstellar neutral hydrogen and its photoionization by solar radiation, we have simulated the magnetic field and plasma distribution throughout the heliosphere from the coronal base out to 100 AU. The solar magnetic field is assumed to be a tilted-dipole field conditions that are typical near solar minimum. Comparing the simulation runs with and without effects of pickup protons, we quantitatively evaluate the compression effect of the solar wind deceleration on the interplanetary magnetic field intensity.