The Helios spacecraft zodiacal light photometers can be used to measure persistent elongated structures at interplanetary distances from the Sun. These data give the heliospheric poistions of these structures from their east to west motion with time. An outward motion of the material within each structure can be determined from its curvature. This technique has been used to measure over 40 of these structures from solar minimum to solar maximum (1976 through 1979) using both Helios A and Helios B observations. The positions of the structures measured range from low latitude to as high as 50¿. The speeds determined have a mean value of 301¿47 km s-1. The modeling, which determines densities for these structures from 0.15 to over 1.0 AU, indicates that these heliospheric structures can have densities many times above the ambient and that the density in excess of an r-2 ambient can differ greatly along their curved extents at any given time. Most of the structures measured in this sample either remain approximately the same density or decrease in density with height above the Sun. This implies that these structure are generally remnants of features maintained by the physical processes which formed them near the surface of the Sun (as streamers) and that they are not caused by interplanetary interactions. ¿American Geophysical Union 1991