Conjugate observations of electromagnetic ion cyclotron waves associated with traveling convection vortex events

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dc.contributor.authorKim, Hyominen
dc.contributor.authorClauer, C. Roberten
dc.contributor.authorGerrard, Andrew J.en
dc.contributor.authorEngebretson, Mark J.en
dc.contributor.authorHartinger, Michael D.en
dc.contributor.authorLessard, Marc R.en
dc.contributor.authorMatzka, Juergenen
dc.contributor.authorSibeck, David G.en
dc.contributor.authorSinger, Howard J.en
dc.contributor.authorStolle, Claudiaen
dc.contributor.authorWeimer, Daniel R.en
dc.contributor.authorXu, Zhonghuaen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.contributor.departmentCenter for Space Science and Engineering Research (Space@VT)en
dc.date.accessioned2019-10-03T17:21:57Zen
dc.date.available2019-10-03T17:21:57Zen
dc.date.issued2017-07en
dc.description.abstractWe report on simultaneous observations of electromagnetic ion cyclotron (EMIC) waves associated with traveling convection vortex (TCV) events caused by transient solar wind dynamic pressure (P-d) impulse events. The Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft located near the magnetopause observed radial fluctuations of the magnetopause, and the GOES spacecraft measured sudden compressions of the magnetosphere in response to sudden increases in Pd. During the transient events, EMIC waves were observed by interhemispheric conjugate ground-based magnetometer arrays as well as the GOES spacecraft. The spectral structures of the waves appear to be well correlated with the fluctuating motion of the magnetopause, showing compression-associated wave generation. In addition, the wave features are remarkably similar in conjugate hemispheres in terms of bandwidth, quasiperiodic wave power modulation, and polarization. Proton precipitation was also observed by the DMSP spacecraft during the wave events, from which the wave source region is estimated to be 72 degrees-74 degrees in magnetic latitude, consistent with the TCV center. The confluence of space-borne and ground instruments including the interhemispheric, high-latitude, fluxgate/induction coil magnetometer array allows us to constrain the EMIC source region while also confirming the relationship between EMIC waves and the TCV current system.en
dc.description.notesThe work at New Jersey Institute of Technology was supported by National Science Foundation (NSF) grant AGS-1547252. The work at Virginia Tech was supported by NSF grant PLR-1543364. The fluxgate magnetometer projects at SPA and AGOs are supported by NSF grants PLR-1247975 and PLR-1443507, respectively, to New Jersey Institute of Technology. The induction coil magnetometer projects at STF, IQA, SPA, and AGOs are supported by NSF grants PLR-1341677 to the University of New Hampshire and PLR-1341493 to Augsburg College. The authors would like to thank the following persons/institutes for providing data: the THEMIS team for fluxgate magnetometer and electrostatic analyzer data; the NOAA GOES team for fluxgate magnetometer data; the DMSP team for SSJ particle data; Lorne McKee at Natural Resources Canada (NRCan) and INTERMAGNET for fluxgate magnetometer data from IQA, which is operated by NRCan; the Technical University of Denmark National Space Institute (DTU Space) for the fluxgate magnetometer data (STF); the British Antarctic Survey (BAS) team for fluxgate data (HBA); and the AGO project team for operations of the magnetometer stations. All data used in this study can be obtained from the following data repositories and tools: OMNI, ACE, and THEMIS data from the NASA Coordinated Data Analysis Web (CDAWeb) at http://cdaweb.sci.gsfc.nasa.gov and Space Physics Environment Data Analysis Software (SPEDAS); GOES magnetometer data from the data archive at National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Information (NCEI, previously known as NGDC) (http://satdat.ngdc.noaa.gov/sem/goes/data/new_full/); DMSP particle data from the DMSP Online Spectrogram Viewer Tool at http://sd-www.jhuapl.edu/Aurora/spectrogram/index.html; IQA fluxgate data from the Intermagnet (www.intermagnet.org); STF fluxgate magnetometer data from the DTU database (https://ftp.space.dtu.dk/data/Ground_magnetometers/Adjusted/); HBA fluxgate data from the BAS Data Access System (http://psddb.nerc-bas.ac.uk); and SPA and AGO fluxgate and induction coil magnetometer data from the New Jersey Institute of Technology database (www.antarcticgeospace.org).en
dc.description.sponsorshipNational Science Foundation (NSF) [AGS-1547252]; NSF [PLR-1543364, PLR-1247975, PLR-1443507, PLR-1341677, PLR-1341493]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1002/2017JA024108en
dc.identifier.eissn2169-9402en
dc.identifier.issn2169-9380en
dc.identifier.issue7en
dc.identifier.urihttp://hdl.handle.net/10919/94343en
dc.identifier.volume122en
dc.language.isoenen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.titleConjugate observations of electromagnetic ion cyclotron waves associated with traveling convection vortex eventsen
dc.title.serialJournal of Geophysical Research-Space Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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