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A frequency decreases of Pc5 is noted during the main phase, which can be attributed to injections of heavier ions (O<jats:sup>+<\/jats:sup> and He<jats:sup>+<\/jats:sup>) into the ring current. In addition, it is observed that during the main phase of the storm, the frequency drop of the Pc5 in the IMAGE chain around the MLT midnight is larger than that in the ALASKA chain at MLT post noon. Meanwhile, the longitudinal variation \u0394<jats:italic>H<\/jats:italic> with the maximum around midnight implies a highly asymmetric distribution of the ring current. These results suggested that the frequency variation of Pc5 pulsation during storms is related to the partial distribution in the ring current.<\/jats:p>","DOI":"10.1186\/bf03351841","type":"journal-article","created":{"date-parts":[[2014,8,15]],"date-time":"2014-08-15T03:59:52Z","timestamp":1408075192000},"page":"619-625","update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["The frequency variation of Pc5 ULF waves during a magnetic storm"],"prefix":"10.1186","volume":"57","author":[{"given":"A.","family":"Du","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W.","family":"Sun","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W.","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"X.","family":"Gao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2014,6,20]]},"reference":[{"key":"BF03351841_CR1","first-page":"243","volume":"142","author":"S-I Akasofu","year":"2003","unstructured":"Akasofu, S.-I., W. 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