Musmann G, Neubauer F, Lammers E. Radial variation of the interplanetary magnetic field between 0.3 AU and 1.0 AU - observations by the Helios-1 spacecraft. J Geophys [Internet]. 1976Apr.8 [cited 2025Oct.31];42(1):591-8. Available from: https://journal.geophysicsjournal.com/JofG/article/view/113