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<p><strong>Abstract.</strong> According to the sounding rocket experiment conducted at Hainan ionospheric observatory (19.5° N, 109.1° E), a valley between the E layer and F layer in the ionospheric electron density profile is observed and presented. The sounding rocket was launched in the morning (06:15 LT) on 7 May 2011, and the observed electron density profile outside the valley agrees with the simultaneous observation by the DPS-4 digisonde at the same station. The width of the observeddoi:10.5194/angeo-31-1459-2013 fatcat:nuux47dh3vb7jcnwx6zbglzq3m