Physics – Plasma Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11210206m&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A10, CiteID A10206
Physics
Plasma Physics
14
Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Electric Fields (2411), Space Plasma Physics: Magnetic Reconnection (2723, 7526), Solar Physics, Astrophysics, And Astronomy: Magnetic Reconnection (2723, 7835)
Scientific paper
Reconnection occurs in a reconnection magnetic field geometry when there are positive electric field components tangential to the magnetopause and a magnetic field component normal to it. Because these three components are the smallest of the six electric and magnetic fields, their magnitudes are difficult to determine because of errors in, or oscillations of, the assumed constant direction normal to the current sheet. A method is described for minimizing these errors by appropriate selection of the normal direction and by analyzing the correlations between the large normal electric field and the large tangential magnetic field. The correlation coefficients are equal to ratios of the small fields, which are combined with the less accurate measurements of the averages of the small fields to produce best estimates of the small fields. For more than 120 magnetopause crossings, about 40% had such correlations that signify static conditions during those crossings. This method is applied to 22 polar subsolar magnetopause crossings to show that most were located in the ion diffusion region, as defined by the change of the total magnetic field, and that 14 had a large and steady reconnection rate with a zero parallel electric field. In these events the reconnection rate decreased with increasing guide magnetic field.
Mozer Forrest S.
Retinò Alessandro
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