Search Publications
Hydrogen atoms in the inner heliosphere: SWAN-SOHO and MASCS-MESSENGER observations
Izmodenov, Vlad; Quémerais, Eric; Katushkina, Olga +2 more
We present here a study made by two instruments, Mercury Atmospheric and Surface Composition Spectrometer (MASCS) on MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) and Solar Wind Anisotropy (SWAN) on SOHO that observed the interplanetary background in 2010. The combination of these two data sets allows us to perform the …
Wave number determination of Pc 1-2 mantle waves considering He++ ions: A Cluster study
Escoubet, C. P.; Khotyaintsev, Y.; Santolík, O. +2 more
The present case study concerns narrowband electromagnetic emission detected in the distant cusp region simultaneously with upgoing plasma flows. The wave properties match the usual properties of the Pc 1-2 mantle waves: small angle between the wave vector and the magnetic field line, left-hand polarization, and propagation toward the ionosphere. …
Dawn-dusk asymmetry in solar wind ion entry and dayside precipitation: Results from large-scale simulations
Berchem, J.; Wing, S.; Pitout, F. +2 more
We present the results of numerical studies of the interaction of solar wind ions with the dayside magnetospheric boundary for a southward interplanetary magnetic field and two solar wind speeds (250 and 500 km/s) using the results of global magnetohydrodynamics simulations in conjunction with large-scale kinetic calculations. Results of these stu…
Meridional maps of Saturn's thermal electrons
Carbary, J. F.; Rymer, A. M.
All available observations (July 2004 to June 2011) made by the electron spectrometer (ELS) of the Cassini Plasma Science instrument were used to generate meridional maps of thermal electron fluxes (10-20,000 eV) separated by dayside and nightside. The maps had a spatial resolution of 1 × 1 RS (1 RS = 60,238 km), 10° resoluti…
Dynamics of the correlation between polar cap radio absorption and solar energetic proton fluxes in the interplanetary medium
Donovan, E. F.; Kouznetsov, A.; Knudsen, D. J. +1 more
During solar energetic particle (SEP) events, large fluxes of energetic particles spreading throughout the interplanetary medium (IPM) have access to the upper polar atmosphere where they play important roles in physical and chemical processes. We examine the dynamics of the relation between solar energetic proton (SEP) fluxes detected outside the…
BV technique for investigating 1-D interfaces
Dorville, Nicolas; Belmont, Gérard; Rezeau, Laurence +2 more
To investigate the internal structure of the magnetopause with spacecraft data, it is crucial to be able to determine its normal direction and to convert the measured time series into spatial profiles. We propose here a new single-spacecraft method, called the BV method, to reach these two objectives. Its name indicates that the method uses a comb…
Localization of circularly polarized dispersive Alfvén wave and effect on solar wind turbulence
Sharma, R. P.; Gaur, Nidhi; Sharma, Swati
Solar wind turbulence at large inertial scales is well known for decades and believed to consist of Alfvén cascade. At scales of the order of proton inertial length, Alfvén cascade excites kinetic Alfvén wave, fast wave, or whistler wave that carries wave energy to smaller scales. Despite supporting the kinetic Alfvén wave cascade to elucidate the…
Statistical altitude distribution of Cluster auroral electric fields, indicating mainly quasi-static acceleration below 2.8 RE and Alfvénic above
Karlsson, T.; Li, B.; Masson, A. +3 more
Results are presented from a statistical study of high-altitude electric fields and plasma densities using Cluster satellite data collected during 9.5 years between 2 and 4 RE. The average electric fields are most intense on the nightside and associated with an extensive plasma density cavity, with densities of 1 cm-3 or less…
Kinetic model of Janaki et al.'s bifurcated current sheet
Dasgupta, B.; Yoon, P. H.; Janaki, M. S.
Space satellite observations show that current sheets in the space plasma environment are often characterized by bifurcated structures. In a recent paper a two-fluid model of the bifurcated current sheet was constructed on the basis of the pseudo potential method. A straightforward generalization of Janaki et al.'s two-fluid model to kinetic forma…
Contrasting electron acceleration processes during two substorms
Schriver, David; El-Alaoui, Mostafa; Walker, Raymond J. +3 more
Although energetic particle injections during substorms have been observed near geosynchronous orbit since the late 1960s, how the injected particles are accelerated during a substorm is still not fully understood. Studies show that injections are associated with earthward propagating dipolarization fronts and suggest that particle acceleration ca…