geomagnetic secular variation

geomagnetic secular variation

[¦jē·ō·mag¦ned·ik ¦sek·yə·lər ver·ē′ā·shən]
(astronomy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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and Ishihara, T.: 2013, Improving total field geomagnetic secular variation modeling from a new set of cross-over marine data.