The authors would like to express our special thanks to Proffesor A. G. Ostrovskii, Dr. C.-H. Kim, and Mr. T. Kondo (Kyushu University) for their useful discussions and comments. Dr. Ishii and Dr. Sakurai kindly provided us their heat flux data for comparison. We are also grateful to JMA and JODC for offering data files. The heat flux data analyzed in this study is available to anyone via anonymous ftp > 22.214.171.124.
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