<formula alphabet="latin">O+ observations in the cusp: Implications for dayside magnetic field topology

Details <formula alphabet="latin">O+ observations in the cusp: Implications for dayside magnetic field topology <formula alphabet="latin">O+ observations in the cusp: Implications for dayside magnetic field topology

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.5977f&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A4, p. 5977-5986

Physics

Plasma Physics

5

Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Magnetic Reconnection

Scientific paper

Under conditions of sustained northward interplanetary magnetic field (IMF), magnetospheric magnetic field lines on the dayside may undergo multiple reconnection, producing closed flux tubes filled with solar wind plasma. Ionospheric O+ beams with energies of ~1keV/e that are propagating parallel to the magnetic field in the northern cusp region are potential evidence for this multiple reconnection process. Using observations from the Polar spacecraft, we present evidence of parallel propagating O+ in the northern cusp. A statistical study of these events indicates that they are very rare in the Polar data. Therefore, under the assumption that parallel propagating O+ beams in the northern cusp are evidence of multiple reconnection, the occurrence frequency of multiple reconnection on the dayside under northward IMF conditions appears to be small. Thus this process is insufficient to account for the nearly continuous population of solar wind plasma on closed field lines in the magnetosphere.

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