{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T05:09:32Z","timestamp":1774588172244,"version":"3.50.1"},"reference-count":0,"publisher":"Copernicus GmbH","issue":"4","license":[{"start":{"date-parts":[[2000,4,30]],"date-time":"2000-04-30T00:00:00Z","timestamp":957052800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/www.egu.eu"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Ann. Geophys."],"abstract":"<jats:p>Abstract. A 16 mHz Pc4 pulsation was recorded on March 17, 1998, in the prenoon sector of the Earth's magnetosphere by the Equator-S satellite. The event is strongly localized in radial direction at approximately L = 5 and exhibits properties of a field line resonance such as an ellipticity change as seen by applying the method of the analytical signal to the magnetic field data. The azimuthal wave number was estimated as m \\\\approx 150. We discuss whether this event can be explained by the FLR mechanism and find out that the change in ellipticity is more a general feature of a localized Alfv\u00e9n wave than indicative of a resonant process.Key words: Magnetospheric physics (MHD waves and instabilities)\n                    <\/jats:p>","DOI":"10.1007\/s00585-000-0411-5","type":"journal-article","created":{"date-parts":[[2005,4,7]],"date-time":"2005-04-07T14:42:06Z","timestamp":1112884926000},"page":"411-415","source":"Crossref","is-referenced-by-count":9,"title":["A case study of a radially polarized Pc4 event observed by the Equator-S satellite"],"prefix":"10.5194","volume":"18","author":[{"given":"R.","family":"Cramm","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K. H.","family":"Glassmeier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C.","family":"Othmer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K. H.","family":"Fornacon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H. U.","family":"Auster","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W.","family":"Baumjohann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E.","family":"Georgescu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"3145","published-online":{"date-parts":[[2000,4,30]]},"container-title":["Annales Geophysicae"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/angeo.copernicus.org\/articles\/18\/411\/2000\/angeo-18-411-2000.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,1,27]],"date-time":"2021-01-27T22:48:35Z","timestamp":1611787715000},"score":1,"resource":{"primary":{"URL":"https:\/\/angeo.copernicus.org\/articles\/18\/411\/2000\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2000,4,30]]},"references-count":0,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2000]]}},"URL":"https:\/\/doi.org\/10.1007\/s00585-000-0411-5","relation":{},"ISSN":["1432-0576"],"issn-type":[{"value":"1432-0576","type":"electronic"}],"subject":[],"published":{"date-parts":[[2000,4,30]]}}}