TY - RPRT TI - IPS observations of heliospheric density structures associated with active regions AU - Hick, P. AU - Jackson, B. V. AU - Altrock, R. AU - Woan, G. AU - Slater, G. PY - 1996 UR - https://ntrs.nasa.gov/citations/19950064178 ID - 19950064178 ER -