A comparison of recurrent energetic ion enhancements observed at ULYSSES and at 1 AU by IMP 8 and SAMPEX - ULYSSES launch until following the first north polar passage

Details A comparison of recurrent energetic ion enhancements observed at ULYSSES and at 1 AU by IMP 8 and SAMPEX - ULYSSES launch until following the first north polar passage A comparison of recurrent energetic ion enhancements observed at ULYSSES and at 1 AU by IMP 8 and SAMPEX - ULYSSES launch until following the first north polar passage

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.2115r&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 2115

Physics

15

Ulysses Mission, Heliosphere, Ion Temperature, Solar Terrestrial Interactions, Coronal Holes, Polar Regions, Spacecraft Orbits, Rotating Plasmas

Scientific paper

During the Ulysses mission, the Goddard Space Flight Center instrument on IMP 8 and the University of Maryland low energy ion composition analyzer instrument on SAMPEX observed recurrent MeV/amu ion enhancements in the ecliptic plane at 1 AU. We identify those IMP 8/SAMPEX events related to the recurrent events observed at Ulysses from its launch until mid-1996, following the first passage over the north solar pole, and compare their properties. Two types of recurrent events were present at Earth. Recurrent enhancements of particles streaming sunward from CIRs in the outer heliosphere were observed most clearly at Earth after the Ulysses Jupiter encounter. Most of the CIRs/particle enhancements at Ulysses, even at high heliolatitudes, can be associated with recurrent events/high-speed streams at Earth by considering simple corotation delays. This suggests that the events at high latitudes occurred poleward of equatorward extensions of the polar coronal holes which produced corotating high-speed streams in the ecliptic. The observations confirm that the decrease in the intensity of corotating events at high latitudes was predominantly due to the changing spacecraft latitude rather than to a temporal decline in the intensity of corotating events throughout the heliosphere.

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