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  • Kazunari Nawa1Email author,
  • Naoki Suda1,
  • Yoshio Fukao2,
  • Tadahiro Sato3,
  • Yuichi Aoyama4 and
  • Kazuo Shibuya5
Earth, Planets and Space201450:BF03352183

https://doi.org/10.1186/BF03352183

Received: 24 June 1998

Accepted: 22 July 1998

Published: 6 June 2014

Abstract

Imanishi (this issue) commented that (1) the noise level at Matsushiro, Japan (MA) is much lower than at Syowa Station, Antarctica (SY), (2) oscillation signals are not observed at MA, and therefore (3) peaks below 3 mHz observed at SY are unlikely to be real signals of free oscillations. We point out that (1) he made a comparison between MA in the Japanese quiet month and SY in the Antarctic windy month, (2) the Matsushiro record does show up oscillation signals, and therefore (3) his assertion that peaks below 3 mHz observed at SY are unlikely to be real signals is not founded.