Other
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2093t&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2093-2096
Other
1
Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Ionospheric Disturbances
Scientific paper
Northward interplanetary magnetic field (IMF) causes a ``reverse'' convection in the dayside polar ionosphere, i.e., flow having a sunward component at the highest latitudes and anti-sunward flow on both sides of the sunward flow region. Previous studies have shown that this sunward flow region is shifted in the dawn-dusk direction depending on IMF By. This paper reports another new mode of the IMF controlled configuration of the sunward flow region. Seventy-two reverse convection events identified in the Dynamics Explorers 2 dawn-dusk passes were analyzed. Results of statistical analyses show that the sunward flow region expands in the dawn-dusk direction as the magnitude of IMF in the Y-Z plane becomes large. This result can be interpreted by a model which predicts that the dawn-dusk dimension of the high-latitude magnetopause reconnection region from which sunward flow is created extends with the increase of the magnitude of IMF in the Y-Z plane.
Taguchi Satoshi
Warashina M.
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