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Using Van Allen Probes (Radiation Belt Storm Probes (RBSP)) data from October 2012 to July 2014, we investigate the spatial distribution and storm time occurrence of Pc4 (7\u201325\u2009mHz) poloidal waves in the inner magnetosphere. Pc4 poloidal waves are sorted into two categories: waves with and without significant magnetic compressional components. Two types of poloidal waves have comparable occurrence rates, both of which are much higher during geomagnetic storms. The noncompressional poloidal waves mostly occur in the late recovery phase associated with an increase of <jats:italic>D<\/jats:italic><jats:italic>s<\/jats:italic><jats:italic>t<\/jats:italic> toward 0, suggesting that the decay of the ring current provides their free energy source. The occurrence of dayside compressional Pc4 poloidal waves is found correlated with the variation of the solar wind dynamic pressure, indicating their origin in the solar wind. Both compressional and noncompressional waves preferentially occur on the dayside near noon at <jats:italic>L<\/jats:italic>\u223c5\u20136. In addition, compressional poloidal waves are observed at magnetic local time 18\u201324 on the nightside. The location of the Pc4 poloidal waves relative to the plasmapause is investigated. The RBSP statistical results may shed light on the in\u2010depth investigations of the generation and propagation of Pc4 poloidal waves.<\/jats:p>","DOI":"10.1002\/2015ja021134","type":"journal-article","created":{"date-parts":[[2015,5,22]],"date-time":"2015-05-22T11:38:46Z","timestamp":1432294726000},"page":"4748-4762","source":"Crossref","is-referenced-by-count":77,"title":["Storm time occurrence and spatial distribution of Pc4 poloidal ULF waves in the inner magnetosphere: A Van Allen Probes statistical study"],"prefix":"10.1029","volume":"120","author":[{"given":"Lei","family":"Dai","sequence":"first","affiliation":[{"name":"State Key Laboratory of Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences  Beijing China"},{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazue","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Lysak","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chi","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John R.","family":"Wygant","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Craig","family":"Kletzing","sequence":"additional","affiliation":[{"name":"Space Science Laboratory University of California  Berkeley California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Bonnell","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy University of Iowa  Iowa City Iowa USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cynthia A.","family":"Cattell","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Charles W.","family":"Smith","sequence":"additional","affiliation":[{"name":"Department of Physics, Institute for Earth, Oceans and Space University of New Hampshire  Durham New Hampshire USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert J.","family":"MacDowall","sequence":"additional","affiliation":[{"name":"Solar System Exploration Division Goddard Space Flight Center  Greenbelt Maryland USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Scott","family":"Thaller","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aaron","family":"Breneman","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiangwei","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy University of Minnesota, Twin Cities  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xin","family":"Tao","sequence":"additional","affiliation":[{"name":"Department of Geophysics and Planetary Sciences University of Science and Technology of China  Hefei China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lunjin","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Physics University of Texas at Dallas  Richardson Texas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"13","published-online":{"date-parts":[[2015,6,23]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/GM081p0025"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/JA095iA07p10495"},{"key":"e_1_2_7_4_1","first-page":"419","volume-title":"Physics of Space Plasmas (1990) SPI Conf. 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