Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh22a0853r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH22A-0853
Physics
7524 Magnetic Fields, 7536 Solar Activity Cycle (2162)
Scientific paper
We present here an investigation into the orientation of co-rotating interaction regions (CIRs) observed by the ESA/NASA Ulysses spacecraft. Ulysses is uniquely suited to this investigation as it is the only spacecraft to observe CIRs out of the ecliptic plane. Launched in 1990, Ulysses now has a little over 17 years of continual solar wind observations. As such, with the tendency for CIRs to form during the declining phase of solar activity, Ulysses has now observed two separate periods of CIR activity. Using the Planar Magnetic Structure technique to determine the normal to the planes formed by the CIRs: we show that there is a trend between the normal orientation and helio-latitude. At higher helio-latitudes (~30 degrees) the normal tends to become more aligned with the radial direction. We also present range (Sun- Spacecraft) and solar cycle trends. These results are then compared to global CIR models.
Balogh André
Forsyth Robert J.
Horbury Tim S.
Rees Adam
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