A large sunspot capable of producing major solar activity is facing Earth this week, leaving scientists wondering what it will do. This sunspot was the largest in 24 years when it faced Earth last month. Although the sunspot has shrunk since then, it still has the potential to produce significant space weather that could affect us here on Earth.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 8.0.0.0.0