Institution: | 1. Department of Applied Physics, National Defense Academy, Hashirimizu, Yokosuka 239-8686, Japan;2. Instituciò Catalana de Recerca i Estudis Avançats (ICREA) and Institut de Ciencies de l''Espai (IEEC-CSIC), Campus UAB, Facultat Ciencies, Torre C5-Par-2a pl, E-08193 Bellaterra (Barcelona), Spain |