Fine structure in the corona at high latitudes at solar maximum

Microstreams and pressure balance structures in fast solar wind were more e asily detected at Ulysses at 2.2 AU over the poles than at Helios at 0.3 AU . This is because solar rotation leads to dynamic interactions between diff erent speed regimes at a rate that depends on latitude for the same size fe atures. Dynamic interactions make structures more difficult to detect with increasing distance from the Sun. At solar maximum, Ulysses will sample hig h latitude solar wind coming from streamers, providing information on fine structure at the tops of streamers and on the source of slow solar wind. Ex amples are given here of the detectability of various sized structures at U lysses when it is over the polar regions of the Sun.