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The electron temperature (<I>T_e</I>), electron density (<I>N_e</I>), and two components of the electric field were measured from the height of 90 km to 150 km by one of the sounding rockets launched during the SEEK-2 campaign. The rocket went through sporadic E layer (<I>E_s</I>) at the height of 102 km–109 km during ascent and 99 km–108 km during decent, respectively. The energy density of thermal electrons calculated from <I>N_e</I> and <I>T_e</I> shows the broad maximum in the height range of 100–110 km, and it decreases towards the lower and higher altitudes, which implies that a heat source exists in the height region of 100 km–110 km. A 3-D picture of <I>E_s</I>, that was drawn by using <I>T_e</I>, <I>N_e</I>, and the electric field data, corresponded to the computer simulation; the main structure of <I>E_s</I> is projected to a higher altitude along the magnetic line of force, thus producing irregular structures of <I>T_e</I>, <I>N_e</I> and electric field in higher altitude.