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dc.contributor.author
Andrés, Nahuel
dc.contributor.author
Gomez, Daniel Osvaldo
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Bertucci, Cesar
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Mazelle, C.
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Dougherty, M.
dc.date.available
2017-05-29T18:57:42Z
dc.date.issued
2013-02-20
dc.identifier.citation
Andrés, Nahuel; Gomez, Daniel Osvaldo; Bertucci, Cesar; Mazelle, C.; Dougherty, M.; Saturn's ULF wave foreshock boundary: Cassini observations; Elsevier; Planetary And Space Science; 79-80; 20-2-2013; 64-75
dc.identifier.issn
0032-0633
dc.identifier.uri
http://hdl.handle.net/11336/17080
dc.description.abstract
Even though the solar wind is highly supersonic, intense ultra-low frequency (ULF) wave activity has been detected in regions just upstream of the bow shocks of magnetized planets. This feature was first observed ahead of the Earth’s bow shock, and the corresponding region was called the ULF wave foreshock, which is embedded within the planet’s foreshock. The properties as well as the spatial
distribution of ULF waves within the Earth’s foreshock have been extensively studied over the last three decades and have been explained as a result of plasma instabilities triggered by solar wind ions backstreaming from the bow shock. Since July 2004, the Cassini spacecraft has characterized the Saturnian plasma environment including its upstream region. Since Cassini’s Saturn orbit insertion
(SOI) in June 2004 through August 2005, we conducted a detailed survey and analysis of observations made by the Vector Helium Magnetometer (VHM). The purpose of the present study is to characterize the properties of waves observed in Saturn’s ULF wave foreshock and identify its boundary using single spacecraft techniques. The amplitude of these waves is usually comparable to the mean magnetic field intensity, while their frequencies in the spacecraft frame yields two clearly different types of waves: one with frequencies below the local proton cyclotron frequency (OHþ ) and another with frequencies above OHþ . All the wave crossings described here, clearly show that these waves are associated to
Saturn’s foreshock. In particular, the presence of waves is associated with the change in yBn to quasiparallel geometries. Our results show the existence of a clear boundary for Saturn’s ULF wave foreshock, compatible with yBn 451 surfaces.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Foreshock
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Ulf Waves
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Saturn
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Cassini
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Saturn's ULF wave foreshock boundary: Cassini observations
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-23T19:17:08Z
dc.journal.volume
79-80
dc.journal.pagination
64-75
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Andrés, Nahuel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Gomez, Daniel Osvaldo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Bertucci, Cesar. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Mazelle, C.. Institut de Recherche en Astrophysique et Planetologie; Francia
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Fil: Dougherty, M.. Imperial College Of Science And Technology; Reino Unido
dc.journal.title
Planetary And Space Science
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.pss.2013.01.014
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info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0032063313000305
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