Comparison of Solar Cycles: Mid- and Low-Latitude Solar Wind During the Declining Phase of the Solar Cycle

Details Comparison of Solar Cycles: Mid- and Low-Latitude Solar Wind During the Declining Phase of the Solar Cycle Comparison of Solar Cycles: Mid- and Low-Latitude Solar Wind During the Declining Phase of the Solar Cycle

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11b..07e&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH11B-07

Physics

2102 Corotating Streams, 2164 Solar Wind Plasma

Scientific paper

Ulysses measurements now span more than the 11-year solar cycle, and the spacecraft has completed nearly two full polar orbits of the Sun. In 2001, Ulysses was at high latitudes and SWOOPS (Solar Wind Observations Over the Poles of the Sun) solar wind measurements showed that a mid-sized circumpolar coronal hole had formed in the Northern hemisphere near solar maximum. Ulysses then moved towards the equator and encountered a recurrent co-rotating interaction region from 70° N down to 25° N. From 25° N to 20° N SWOOPS observed slow, steady solar wind. Coronal hole maps show that the Northern hemisphere has maintained a large circumpolar coronal hole with a large extension, while in the Southern hemisphere a mid-sized coronal hole has formed at mid-latitudes. The latest Ulysses measurements provide an excellent comparison with the first orbit observations since as in the first orbit Ulysses is crossing the low-latitude region of variability in the descending phase of the solar cycle.

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