Abstract
We present a statistical analysis of equatorial F-peak height vertical drifts during a 5-day HILDCAA event (3–7 July 2003). Prompt penetration-PP drifts have been identified in this study by means of a correlation analysis carried out between the magnitude of disturbed height variations over the equatorial station São Luís-SL (44.6W, 2.33S, dip angle 1.5S) and the magnitudes of the interplanetary electric field at the magnetopause. A comparison between the correlation coefficients for the HILDCAA and the post-HILDCAA days clearly shows that coupling on the post-HILDCAA period is suppressed. The daytime (nighttime) ionospheric responses to magnetopause electric field changes were found to occur within ∼55 min (∼45 min).
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