The interaction of backstreaming ions with the incoming solar wind in the upstream region of the bow shock gives rise to a number of plasma instabilities from which ultralow frequency (ULF) waves can grow. Because of their finite growth rate, the ULF waves are spatially localized in the foreshock region. Previous studies have reported observational evidence of the existence of a ULF wave foreshock boundary, whose geometrical characteristics are very sensitive to the interplanetary magnetic field (IMF) cone angle. The statistical properties of the ULF wave foreshock boundary (UWFB) are examined in detail using Cluster data. A new identification of the UWFB is presented using a specific and accurate criterion for identification of boundary crossings. This criterion is based on the degree of IMF rotation as Cluster crosses the boundary. The obtained UWFB is compared with previous results reported in the literature as well as with theoretical predictions. Also, we examined the possible connection between the foreshock boundary properties and the ion emission mechanisms at the bow shock. © 2015 American Geophysical Union.
Documento: | Artículo |
Título: | The ULF wave foreshock boundary: Cluster observations |
Autor: | Andrés, N.; Meziane, K.; Mazelle, C.; Bertucci, C.; Gómez, D. |
Filiación: | Instituto de Astronomía y Física del Espacio (CONICET-UBA) Buenos Aires Argentina Departamento de Física (FCEN, UBA) Buenos Aires Argentina Physics Department University of New Brunswick Fredericton, New Brunswick Canada Institut de Recherche en Astrophysique et Planétologie Toulouse France |
Palabras clave: | Cluster spacecraft; Earth's foreshock; Interplanetary magnetic field; Particle acceleration; Solar wind; ULF waves |
Año: | 2015 |
DOI: | http://dx.doi.org/10.1002/2014JA020783 |
Título revista: | Journal of Geophysical Research A: Space Physics |
Título revista abreviado: | J. Geophys. Res. A. Space Phys. |
ISSN: | 21699380 |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699380_v_n_p_Andres |