Search Publications
Cluster observations of hot He+ events in the inner magnetosphere
Yamauchi, M.; Dandouras, I.; Nilsson, H. +1 more
In the inner magnetosphere inside 65° invariant latitude, Cluster Ion Spectrometry detected hot He+ events of about a few tens to several hundred eV without the same types of hot H+ signature at the same energy. During the 2001-2006 period when the Cluster orbit was almost constant and approximately north-south symmetric at c…
Signals of solar cosmic ray flux variations inferred from the noise in raw CCD solar images taken by SOHO/EIT
Chae, Jongchul; Oh, Suyeon; Yi, Yu +1 more
The noise embedded in the raw data in one scientific discipline has sometimes been proven to be a valuable signal for another discipline, and there are examples throughout science history. The solar images taken by the solid state detectors (CCDs) of the Sun monitoring satellites are usually cleaned by removing the traces of cosmic rays on the raw…
Technique for measuring and correcting the Taylor microscale
Dasso, S.; Matthaeus, W. H.; Smith, C. W. +3 more
We discuss and develop methods to estimate and refine measurements of the Taylor microscale from discrete data sets. To study how well a method works, we construct a time series of discrete data with a known power spectrum and Taylor scale, but with various truncations of the resolution that eliminate higher frequencies in a controlled fashion. We…
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…