Artículo

Andrés, N.; Gómez, D.O.; Bertucci, C.; Mazelle, C.; Dougherty, M.K. "Saturn's ULF wave foreshock boundary: Cassini observations" (2013) Planetary and Space Science. 79-80(1):64-75
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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 (ΩH+) and another with frequencies above ΩH+. 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 θBn to quasi-parallel geometries. Our results show the existence of a clear boundary for Saturn's ULF wave foreshock, compatible with θBn∼45° surfaces. © 2013 Elsevier B.V. All rights reserved.

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Documento: Artículo
Título:Saturn's ULF wave foreshock boundary: Cassini observations
Autor:Andrés, N.; Gómez, D.O.; Bertucci, C.; Mazelle, C.; Dougherty, M.K.
Filiación:Instituto de Astronomía y Física Del Espacio, CABA, Av. Cantilo 2620 Pabellón IAFE (cp 1428), Buenos Aires, Argentina
Departamento de Física, FCEN, UBA, Buenos Aires, Argentina
Institut de Recherche en Astrophysique et Planétologie, Toulouse, France
Space and Atmospheric Physics, Blackett Laboratory, Imperial College, London, United Kingdom
Palabras clave:Cassini; Foreshock; Saturn; ULF waves; Cassini; Foreshock; Plasma environments; Saturn; Saturn orbit insertion; Spacecraft technique; ULF waves; Ultra-low frequencies; Electromagnetic fields; Plasma shock waves; Solar wind; Spacecraft; Earthquakes
Año:2013
Volumen:79-80
Número:1
Página de inicio:64
Página de fin:75
DOI: http://dx.doi.org/10.1016/j.pss.2013.01.014
Título revista:Planetary and Space Science
Título revista abreviado:Planet. Space Sci.
ISSN:00320633
CODEN:PLSSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320633_v79-80_n1_p64_Andres

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Citas:

---------- APA ----------
Andrés, N., Gómez, D.O., Bertucci, C., Mazelle, C. & Dougherty, M.K. (2013) . Saturn's ULF wave foreshock boundary: Cassini observations. Planetary and Space Science, 79-80(1), 64-75.
http://dx.doi.org/10.1016/j.pss.2013.01.014
---------- CHICAGO ----------
Andrés, N., Gómez, D.O., Bertucci, C., Mazelle, C., Dougherty, M.K. "Saturn's ULF wave foreshock boundary: Cassini observations" . Planetary and Space Science 79-80, no. 1 (2013) : 64-75.
http://dx.doi.org/10.1016/j.pss.2013.01.014
---------- MLA ----------
Andrés, N., Gómez, D.O., Bertucci, C., Mazelle, C., Dougherty, M.K. "Saturn's ULF wave foreshock boundary: Cassini observations" . Planetary and Space Science, vol. 79-80, no. 1, 2013, pp. 64-75.
http://dx.doi.org/10.1016/j.pss.2013.01.014
---------- VANCOUVER ----------
Andrés, N., Gómez, D.O., Bertucci, C., Mazelle, C., Dougherty, M.K. Saturn's ULF wave foreshock boundary: Cassini observations. Planet. Space Sci. 2013;79-80(1):64-75.
http://dx.doi.org/10.1016/j.pss.2013.01.014