Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1406s&link_type=abstract
American Astronomical Society, SPD meeting #40, #14.06; Bulletin of the American Astronomical Society, Vol. 41, p.834
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent increases in spatial and temporal resolution for solar telescopes sensitive to EUV and X-ray have revealed the prevalence of transient jet events from within polar coronal holes. Using data collected by the X-Ray Telescope on Hinode, Savcheva et al. (2007) confirmed the observation, made first by the Soft X-ray Telescope on Yohkoh, that some jets exhibit a motion transverse to the jet outflow direction. The velocity of this transverse motion is, on average, 20 km/s. The direction of the transverse motion, in combination with the standard reconnection model for jet production (e.g. Shibata et al. 1992), reflects the magnetic polarity orientation of the ephemeral active region at the base of the jet. From this signature, we find that during the present minimum phase of the solar cycle the jet-base ephemeral active regions in the polar coronal holes had a preferred east-west direction, and that this direction reversed during the cycle's progression through minimum. In late 2007 and early 2008, the preferred direction was that of the active regions of the coming sunspot cycle (Cycle 24), but since mid 2008 the preferred direction has been that of the active regions of the ending sunspot cycle (Cycle 23).
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