A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock

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dc.contributor.authorGurgiolo, C.
dc.contributor.authorGoldstein, Melvyn
dc.contributor.authorNarita, Y.
dc.contributor.authorGlassmeier, K.-H.
dc.contributor.authorFazakerley, A. N.
dc.date.accessioned2023-11-10T14:21:09Z
dc.date.available2023-11-10T14:21:09Z
dc.date.issued2005-06-11
dc.description.abstractObservations of nongyrotropic electron distributions in the region upstream of the Earth's bow shock suggest that there exists a mechanism to lock in their phase, otherwise they would rapidly gyrophase mix into a ring-beam distribution. Measurements by the Plasma Electron and Current Experiment (PEACE) on the Cluster spacecraft have provided a way of determining the rotational period of a nongyrotropic electron distribution. For the time period studied, the rotational period is found to be ≈0.5 Hz, significantly lower than the local Larmor frequency but in line with the frequency of waves observed in the local magnetic field. Detailed wave analysis has revealed that the waves are most likely ordinary right-hand whistler waves. The conclusion is that the waves provide the necessary phase locking mechanism. It is not clear whether those waves are generated by the nongyrotropic distribution or are produced by other means and then cause the observed nongyrotropy.en_US
dc.description.sponsorshipCG would like to acknowledge support by NASA grant NAG5-6099. The work by YN and KHG was financially supported by the German Ministerium für Bildung und Forschung and the Deutsches Zentrum für Luft- und Raumfahrt under contract 50OC0103. The authors would also like to recognize the contributions of Murphy, whose diligence and perseverance was able to place a data gap in Cluster 2 directly on top of the event being analyzed.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2005JA011010en_US
dc.format.extent11 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2cwmo-ithv
dc.identifier.citationGurgiolo, C., M. L. Goldstein, Y. Narita, and K.-H. Glassmeier (2005), A phase locking mechanism for nongyrotropicelectron distributions upstream of the Earth’s bow shock, J. Geophys. Res., 110, A06206, doi:10.1029/2005JA011010.en_US
dc.identifier.urihttps://doi.org/10.1029/2005JA011010
dc.identifier.urihttp://hdl.handle.net/11603/30674
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Goddard Planetary Heliophysics Institute (GPHI)
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleA phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shocken_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-5317-988Xen_US

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