A magnetic cloud at Pioneers 10 and 11: Relation to heliospheric current sheet, stream interface, and energetic ions

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Interplanetary Magnetic Fields, Particle Emission, Solar Wind

Scientific paper

A magnetic cloud detected at 1 AU by Earth-orbiting spacecraft, at 4.8 AU by Pioneer 11, and at 6.1 AU by Pioneer 10 is interpreted in terms of a flux rope with a steeply inclined axis and a highly-distended, cylindrical cross-section. A possible double-rope interpretation is also considered. The field rotation within the cloud carried the polarity change marking sector boundary passage; the cloud thus formed an extensive occlusion in the heliospheric current sheet. Within the cloud at Pioneer 11 and following it at Pioneer 10 are stream interface signatures bounding energetic particle fluxes, a pattern documented earlier adjacent to sector boundaries without clouds. This finding raises a number of interesting questions about the relationship between a transient and steady state features.

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