Abstract

Abstract A surprise discovery during the Ulysses flyby of Jupiter was the presence of what have been called null field events in the outer magnetosphere. The signatures are quite distinct from those of the multiple magnetodisk encounters seen closer to the planet. Subsequently, similar events have been identified in both Pioneer and Voyager spacecraft magnetometer data. We propose that these events are formed by the breaking off of material from the outer edge of the magnetodisk current sheet. We discuss their likely origin, evolution, dynamics and internal structure.

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