ULYSSES magnetic field observations of fluctuations within polar coronal flows

Physics

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Coronal Holes, Polar Regions, Solar Magnetic Field, Solar Wind, Variations, Fractals, Helios Project, In Situ Measurement, Ulysses Mission

Scientific paper

The Ulysses spacecraft has gathered data from within flows from the Sun's southern polar coronal hole, the first in situ measurement of this region. We present a brief analysis of the heliospheric magnetic field data from this region, using a fractal method. As is the case near the ecliptic, estimated spectral exponents are near 5/3 on spacecraft scales of seconds to minutes. On longer time scales, however, there appears to be a significantly different population in polar flows, which is similar to that found by the Helios spacecraft in fast solar wind flows at 0.3 AU.

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