Possible link of sudden onset and short-time periodic pulsation of polar mesosphere summer echoes to ULF Pc5 geomagnetic pulsations and solar wind dynamic pressure enhancement

Youngsook Lee1, Sheila Kirkwood2 and Young-Sil Kwak1, (1)KASI Korea Astronomy and Space Science Institute, Daejeon, Korea, Republic of (South), (2)IRF Swedish Institute of Space Physics Kiruna, Kiruna, Sweden