Empirical orthogonal functions (EOF) analysis of spatial patterns of dominant variability in the Indian Ocean Willy Bonanja Manik ; Yahya Darmawan ; Munawar Munawar ; Nardi Nardi ; Fendy Arifianto ; Ervan Ferdiansyah Komunikasi Fisika Indonesia 8 Sep 2026 10.31258/jkfi.22.1.23-26