Radial dependence of solar wind parameters in the ecliptic (1.1 Ro - 61 AU)

Abstract

The radial denpendence of four solar wind parameters (plasma density N, velocity V, temperature T, and magnitude of the interplanetary magnetic field B) are derived from remote sensing data of the solar corona and from in situ measurements in the heliosphere (Helios-1, 2,Pioneer-10, 11, and Voyager-1, 2). Using doubly logarithmic scaling ('solar wind parameter vs radial distance from the Sun') one finds two distinct intervals in the ecliptic, i.e., an exponential section within, approximately, the inner heliosphere and a linear section - up to at least 61 AU - in the outer heliosphere.