Initial Findings of S-310-31, 32 (SEEK-2)

We have the initial findings from the analysis of data obtained by on-board observation instruments of the S-310-31 and 32 (SEEK-2) rockets. The rockets were launched from Uchinoura on the night of August 3, 2002, in order to elucidate the structure and generation mechanism of the quasi-periodic echo produced by the sporadic E layer. Variations of electron density and electric field relating to the sporadic E layer were observed. Six presentations (five oral and one poster presentation) concerning the SEEK-2 experiments were given at the conference of the Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS) held at the University of Electro-Communications from November 11 to 14, 2002. As shown in the picture, outside the original experiment purpose, a new emission phenomenon, different from but concurrent with TMA (trimethyl aluminum) release, was observed. The mechanism of this emission is very interesting. Further data analysis is required.

This photo, taken in Hata, Kochi Prefecture, by the observation team of Kyoto University and Clemson University, shows the emission in the TMA release experiment. The TMA emission is seen as the spiral pattern at the upper right of the picture and the dark striation at the upper left. The faint, broad image from the center to left in the lower part is the new emission phenomenon in question. The TMA emission looks like a spiral because of the motion of atmosphere.
(Photo by Dr. M.F. Larsen, Clemson University).