The following subjects are statistically studied to give the indirect evidences which sustain Namekawa's theory of main and secondary typhoons; frequency distribution of the minimum central pressure, areal distribution of the formation of severe typhoon, relative position of the centers of main and secondary typhoons, and dimension of the inner core of main typhoon.
The length of the manuscripts should not exceed 18,000 words for an Article and 4,500 words for Notes and Correspondence (approximately 60 and 15 double-spaced pages formatted using the JMSJ Word template, respectively). The manuscript should be double spaced in 12 point type, and all pages and lines must be numbered consecutively. The word limit does not include the title page, abstract, acknowledgements, references, tables, or figure captions.
