According to Vegard and others, the high atmosphere generally consists of Nitrogen crystals. These should act upon earth's magnetic field. In the present note, the author wished to put forward a consideration in order to explain quantitatively the duirnal variation of the magnetic field.
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.
