Periodic LF wave radiation associated with pulsating aurora

The pulsating aurora accompanied with LF waves was found from the observation by the ground-based SIT all-sky TV and a sounding rocket S-520-12 launched from Andφya, Norway at 0206 : 00 UT on February 26,1990. On the basis of the correlation analysis, the LF waves lagged behind auroral emission by 8s. This evidence is explained by the assumption that the pulsating LF waves were generated by precipitating low energy electrons modulated near the magnetic equator simultaneously with high energy auroral electrons causing the auroral emission. It was also derived from the ray tracing method, that the LF waves were generated in the altitude range from 2000km to 4700km along the magnetic field line of L=6.7 on which pulsating auroral patch existed