Fig. 7


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Determined electron density excess ρe for the 2011 March 7 and 2014 February 25 events. The results were obtained at three different times for each event, and they are shown in different colors, black, red, and cyan in chronological order (20:24 UT, 20:39 UT, and 20:54 UT for the 2011 March 7 event and 01:24 UT, 01:39 UT, and 01:54 UT for the 2014 February 25 event). The upper row shows the ρe distributions over position angle ζ. The position angle that ζ = 0° is at the projected directional axis of the ellipsoid model. The lower row shows the ρe distributions over height. Lines in solid and dashed represent two empirical electron density models in Leblanc et al. (1998) and Saito et al. (1977), respectively.

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