Time series measurements of chromospheric emission and possible evidence for differential rotation

Horne, J. H., Baliunas, S. L., Noyes, R. W., Duncan, D. K., & Vaughan, A. H. (2008). Time series measurements of chromospheric emission and possible evidence for differential rotation. In Cool Stars, Stellar Systems, and the Sun (pp. 143–145). Springer Berlin Heidelberg. https://doi.org/10.1007/3-540-12907-3_190