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A sizable total-pressure (magnetic pressureplus kinetic pressure) enhancement was found within the high-speed wind streamobserved by Helios 2 in 1976 near 0.3 AU. The proton density and temperature andthe magnetic magnitude simultaneously increased for about 6 h. This pressurerise was associated with a comparatively large southward flow velocity component(with Vz ≈ –100 km · s–1)and magnetic-field rotation. The pressure enhancement was associated withunusual features in the electron distribution function. It shows a wide angulardistribution of electron counting rates in the low-energy (57.8 eV) channel,while previous to the enhancement it exhibits a wide angular distribution ofelectron count rate in the high-energy (112, 221 and 309 eV) channels, perhapsindicating the mirroring of electrons in the converging field lines of thebackground magnetic field. These fluid and kinetic phenomena may be explained asresulting from an interplanetary magnetic flux rope which is not fully convectedby the flow but moves against the background wind towards the Sun

Pressure enhancement associated with meridional flow in high-speed solar wind: possible evidence for an interplanetary magnetic flux rope