Ulysses' return to the slow solar wind

After ten long years of wandering the uncharted seas, Ulysses returned to his home port of Ithaca. Similarly, after its unprecedented five year odyssey through the previously uncharted regions over the poles of the Sun, the Ulysses spacecraft has returned to the slow, variable solar wind which dominates observations near the ecliptic plane. Solar wind plasma and magnetic field observations from Ulysses are used to examine this return from the fast polar solar wind through the region of solar wind variability and into a region of slow solar wind from the low latitude streamer belt. As it journeyed equatorward, Ulysses encountered a large corotating interaction region and associated rarefaction region on each solar rotation. Due to these repeated interactions, Ulysses also observed numerous shocks, all of which have tilts that are consistent with those expected for shocks generated by corotating interaction regions. Eventually, Ulysses emerged into a region of unusually steady slow solar wind, indicating that the tilt of the streamer belt with respect to the solar heliographic equator was smaller than the width of the band of slow solar wind from the streamer belt.

[1]  B. Barraclough,et al.  He abundance variations in the solar wind: Observations from Ulysses , 1995 .

[2]  W. Feldman,et al.  The band of solar wind variability at low heliographic latitudes near solar activity minimum: Plasma results from the Ulysses rapid latitude scan , 1995 .

[3]  W. Feldman,et al.  The northern edge of the band of solar wind variability: Ulysses at ∼4.5 AU , 1997 .

[4]  J. Gosling COROTATING AND TRANSIENT SOLAR WIND FLOWS IN THREE DIMENSIONS , 1996 .

[5]  J. Gosling,et al.  Ulysses observations of the northward extension of the heliospheric current sheet , 1997 .

[6]  J. Phillips,et al.  Latitudinal variation of solar wind corotating stream interaction regions: Ulysses , 1993 .

[7]  V. Pizzo The evolution of corotating stream fronts near the ecliptic plane in the inner solar system: 2. Three‐dimensional tilted‐dipole fronts , 1991 .

[8]  David J. McComas,et al.  The Ulysses solar wind plasma experiment , 1992 .

[9]  Edward J. Smith,et al.  The magnetic field investigation on the Ulysses mission - Instrumentation and preliminary scientific results , 1992 .

[10]  C. M. Hammond,et al.  ULYSSES solar wind plasma observations from peak southerly latitude through perihelion and beyond , 1995 .

[11]  W. Feldman,et al.  Solar wind helium and hydrogen structure near the heliospheric current sheet: A signal of coronal streamers at 1 AU , 1981 .

[12]  D. Mccomas,et al.  Ulysses observations of Alfvén waves in the southern and northern solar hemispheres , 1995 .

[13]  J. Gosling,et al.  Ulysses' rapid crossing of the polar coronal hole boundary , 1998 .

[14]  P. Gazis The Latitudinal Structure of the Solar Wind in the Vicinity of the Solar Equator near Solar Minimum: 1986 and Predictions for 1997 , 1997 .

[15]  C. M. Hammond,et al.  Ulysses Solar Wind Plasma Observations at High Southerly Latitudes , 1995, Science.