Detection of a Preferred Direction of Polar-Latitude Magnetic Bipoles via the Reconnection Bright Point in X-Ray Jets

Details Detection of a Preferred Direction of Polar-Latitude Magnetic Bipoles via the Reconnection Bright Point in X-Ray Jets Detection of a Preferred Direction of Polar-Latitude Magnetic Bipoles via the Reconnection Bright Point in X-Ray Jets

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1304s&link_type=abstract

American Astronomical Society, SPD meeting #40, #13.04; Bulletin of the American Astronomical Society, Vol. 41, p.832

Physics

Scientific paper

Martin and Harvey (1979, Sol. Phys. 64, 93) found that during the solar minimum between Cycles 20 and 21 ephemeral active regions at high latitudes (55-65 degrees) showed a definite preference for the east-west magnetic direction expected from Hale's Law for the active regions of the coming solar cycle. In the present study, we use Hinode X-Ray Telescope movies of X-ray jets observed in and around the polar coronal holes to examine whether the magnetic bipoles at polar latitudes (> 60 degrees) during the present Cycle 23-24 minimum display any preference in their east-west direction. The particular feature of an X-ray jet that we use to detect the magnetic direction of the magnetic bipole spanning the base of the jet is the smaller bright-point bipole produced at one end of the jet-base bipole by the jet-producing reconnection with the surrounding high-reaching background field in and around the coronal hole (a la Shibata et al 1992, PASJ, 44, L173). For any jet-producing bipole that has an obvious east-west component to its direction, the east-west magnetic direction of the bipole is deduced from the polarity of the polar-cap background field and whether the reconnection bright point is on the east or west end of the jet-base bipole. For an initial collection of about 100 polar jets, observed in late 2006 and early 2007 and produced by bipoles having obvious east-west inclination, we find that a majority ( 60%) of the bipoles had the east-west direction expected from Hale's Law for the coming solar cycle (Cycle 24). We can use this method to see if this direction preference at polar latitudes changes as Cycle 24 progresses.
This work was supported by the NASA/MSFC Undergraduate Student Research Program and by NASA's Heliophysics Division through the Hinode Mission and the Heliophysics Guest Investigators Program.

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