Search Publications
Size and amplitude of Langmuir waves in the solar wind
Malaspina, D. M.; Hess, S. L. G.; Ergun, R. E.
Langmuir waves in the solar wind are known to be the origin of many types of solar radio emissions. In situ observations have shown that the most intense Langmuir waves often appear as wave packets. Several models have been proposed to explain this localization, such as kinetic localization and eigenmode formation. In the present paper we investig…
The magnetic configuration of the high-latitude cusp and dayside magnetopause under strong magnetic shears
Lucek, E.; Dunlop, M.; Liu, Z. X. +8 more
This paper investigates the structure of the magnetic field near the magnetopause (MP) by analyzing the multiple-point magnetic measurements from the Cluster mission. In this paper, the spatial distribution of the curvature radius of the MP surface at the noon-midnight meridian and for situations with moderate dynamical pressure of solar wind is i…
The transmission of upstream waves to the magnetosphere: An analysis at widely separated ground stations
Francia, P.; Villante, U.; De Paulis, C.
On 18 February 2003 a long-duration, almost monochromatic, wave event was detected by Cluster at radial distances from the bow shock smaller than ≈10 Re. The interplanetary magnetic field orientation determined a wide and almost symmetric foreshock region around the bow shock nose, providing highly favorable conditions for a direct wave penetratio…
Modeling substorm ion injection observed by the THEMIS and LANL spacecraft in the near-Earth magnetotail
El-Alaoui, Mostafa; Walker, Raymond J.; Zhou, Meng +3 more
In this paper, we studied a substorm ion injection event by using magnetohydrodynamic (MHD) and large-scale kinetic (LSK) simulations. On 23 March 2007 the Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellite constellation provided us with a unique opportunity to study a substorm injection in the region beyond geo…
Magnetopause response to variations in the solar wind: Conjunction observations between Cluster, TC-1, and SuperDARN
Dandouras, I.; Lucek, E.; Liu, Z. X. +5 more
How the solar wind affects the location of the magnetopause has been widely studied and excellent models of the magnetopause based on in situ observations in the solar wind and at the magnetopause have been established, while the careful insight into the responses of the magnetopause to the variations in the solar wind can still provide us some ne…
Properties of energetic particle bursts at dawnside magnetosheath: Cassini observations during the 1999 Earth swing-by
Krupp, N.; Mitchell, D. G.; Armstrong, T. P. +2 more
During Cassini's Earth swing-by in 1999, the Low-Energy Magnetospheric Measurement System (LEMMS) detected energetic particles at the distant dawn magnetosheath. LEMMS identified 9 electron bursts and continuous proton flux surges at least up to 100 keV at X = -72 Re to -102 Re during the southward turning of the interplanetary magnetic field. All…
Shock-driven variation in ionospheric outflow during the 11 October 2001 moderate storm
Dandouras, I.; Klecker, B.; Kistler, L. M. +4 more
The Composition and Distribution Function (CODIF) Analyzer on board the Cluster spacecraft frequently observes narrow-energy, field-aligned O+ ions over the polar caps and in the lobes, particularly during storm times. This population is due to ion outflow from the cusp. During the 11 October 2001 moderate storm, CODIF, located in the s…
Velocity profile of interplanetary coronal mass ejections beyond 1 AU
Lara, A.; Flandes, A.; Borgazzi, A. +1 more
We analyze the dynamics of interplanetary coronal mass ejections (ICMEs) through the interplanetary medium from the lower solar corona to ∼5.3 AU. Our analysis uses a one-dimensional hydrodynamical model derived from the fluid equation of motion that considers an effective drag force under both the laminar and turbulent hypotheses (low and high Re…
Saturn's low-latitude boundary layer: 2. Electron structure
Coates, A. J.; Dougherty, M. K.; Fazakerley, A. N. +2 more
The boundary of a planetary magnetosphere is the site of mass, momentum, and energy transport. This transport produces a layer of mixed solar wind and magnetospheric plasma inside and adjacent to the boundary. In the case of Earth, the electron structure of this layer is distinctive, and has been explained by models of the layer on open magnetic f…
Nonlinear coupling of kinetic Alfvén waves and magnetosonic waves in plasma
Sharma, R. P.; Kumar, Sanjay
This paper presents the model equations governing the nonlinear interaction between kinetic Alfvén waves and magnetosonic waves in plasmas (having β ≫ me/mi). The nonlinear dynamical equation satisfies the modified Zakharov system of equations by taking the nonadiabatic response of the density in the form of a magnetosonic wa…