Simultaneous measurements of sunspot umbral oscillations in the photosphere, chromosphere, and transition region

Thomas, J. H., Lites, B. W., Gurman, J. B., & Ladd, E. F. (1987). Simultaneous measurements of sunspot umbral oscillations in the photosphere, chromosphere, and transition region. The Astrophysical Journal, 312, 457-461. doi:10.1086/164890

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