The financial support of the Peruvian National Council of Science, Technology, and Technological Innovation (CONCYTEC/CIENCIACTIVA) for the doctoral studies of the first author is acknowledged. In addition, the authors would like to thank Sumitomo Steel Wire Corp. (SEI-SSW) for the generous donation of strands and anchorages for this test. The authors acknowledge the technical support of Mr. Masato Yamada and Mr. Katsuhito Oshima from SEI-SSW during the course of this research. Authors would like to thank the support of Tsuyoshi Takahashi, graduate student at Kyoto University, during the testing. All opinions, findings, and conclusions stated in this paper are those of the authors and do not necessarily reflect the views of the supporting institutions.

An analysis of the occurrence of equatorial plasma bubbles (EPBs) around the world during the 2015 St. Patrick's Day geomagnetic storm is presented. A network of 12 Global Positioning System receivers spanning from South America to Southeast Asia was used, in addition to colocated VHF receivers at three stations and four nearby ionosondes. The suppression of postsunset EPBs was observed across most longitudes over 2 days. The EPB observations were compared to calculations of the linear Rayleigh‐Taylor growth rate using coupled thermosphere‐ionosphere modeling, which successfully modeled the transition of favorable EPB growth from postsunset to postmidnight hours during the storm. The mechanisms behind the growth of postmidnight EPBs during this storm were investigated. While the latter stages of postmidnight EPB growth were found to be dominated by disturbance dynamo effects, the ini...