Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603107w&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 3, CiteID L03107
Astronomy and Astrophysics
Astrophysics
6
Magnetospheric Physics: Plasma Convection (2463), Ionosphere: Plasma Convection (2760), Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Ionosphere: Polar Cap Ionosphere, Solar Physics, Astrophysics, And Astronomy: Magnetic Reconnection (2723, 7835)
Scientific paper
The interchange cycle is a mode of magnetic flux circulation that dominates when the interplanetary magnetic field (IMF) clock angle ($\theta$ c ≡ atan2(B Y , B Z )) lies in the range of |$\theta$ c | $\lessim$ 30°. It consists of IMF-lobe reconnection in one hemisphere and lobe-closed reconnection in the other hemisphere, producing in the ionosphere an interchange-type merging cell in the former hemisphere and a reciprocal cell in the latter hemisphere. For a given IMF clock angle and a given dipole tilt angle, there usually exist two independent interchange cycles. Thus the two interchange cycles drive twin reverse cells in both hemispheres, but the category of each reverse cell (either an interchange-type merging cell or a reciprocal cell) depends on the given conditions. In this paper, we demonstrate how the reverse cell pattern changes systematically depending on the IMF orientation and the dipole tilt.
Sofko George J.
Watanabe Masakazu
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