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Solar Wind Speed And Temperature Relationship
Matthaeus, William H.; McComas, David J.; Henney, Carl J. +1 more
Previous studies of solar wind proton temperature and speed have found a break in the curve between 400 and 550 km/s. Examining all the OMNI 2 data from 1965 to 2009, we create plots binned in both temperature and speed in order to identify where the majority of the points lie. Using yearly color plots to evaluate the curve shape we find most of t…
Quasi-thermal noise spectroscopy: preliminary comparison between kappa and sum of two Maxwellian distributions
Issautier, K.; Zouganelis, I.; Moncuquet, M. +3 more
Quasi-thermal noise spectroscopy has been intensively used to measure in situ the solar wind electron density and core temperature in space with various spacecraft. This method allowed study of the large-scale properties of the solar wind. This paper reminds theoretical tools to compute the quasi-thermal noise spectroscopy using a superposition of…
Composition Of The Inner Source Measured With The Solar Wind Ion Composition Spectrometer On Ulysses
Geiss, J.; Gloeckler, G.; Fisk, L. A.
To explain the unexpected discovery of C+, the existence of an inner source of pickup ions close to the Sun was proposed. We report on detailed analyses of the composition and the radial and latitudinal variations of inner source pickup ions measured with the Solar Wind Ion Composition Spectrometer on Ulysses from 1991 to 1998, approach…
Spectral anisotropy of solar wind turbulence in the inertial range and dissipation range
Podesta, J. J.
Wavelet analysis is a tool that can simultaneously analyze spacecraft data in both time and frequency. This enables the magnetic energy spectrum (trace spectrum) to be measured for different angles between the local mean magnetic field B0 and the direction of the mean flow within a single data set. Examples obtained around solar minimum…
Spectrum of the electron density fluctuations: preliminary results from Ulysses observations
Alexandrova, O.; Issautier, K.; Mangeney, A.
Ulysses in-situ measurements have given a new picture on the large-scale properties of the fast solar wind as well as on the microscopic scales. From the large sample of data obtained during Ulysses fast latitudinal scans in 1994 and 2007 occuring both near solar minima, we will present the spectrum of the electron density fluctuations. The prelim…
The Three-Dimensional Structure of the Inner Heliosphere
Riley, Pete
In this review we summarize our current knowledge regarding the three-dimensional structure of the quasi-steady, large-scale inner heliosphere. This understanding is based on the interpretation of a wide array of remote and in situ measurements, in conjunction with sophisticated numerical models. Observations by the Ulysses spacecraft, in particul…
Interaction of the solar wind and stream particles, results from the Cassini dust detector
Postberg, Frank; Grün, Eberhard; Kempf, Sascha +5 more
The stream particles are nanometer-size dust particles ejected from the jovian and the saturnian systems with velocities greater than 100 kms-1. Due to their small size, stream particles are more sensitive to the electromagnetic force than to gravity. It has been shown by the simulations that the stream-particle dynamics in interplaneta…
Radial Heliospheric Magnetic Fields in Solar Wind Rarefaction Regions: Ulysses Observations
Lario, D.; Roelof, E. C.
We examine the distribution of directions of the heliospheric magnetic field (HMF) measured by the Ulysses spacecraft during its mid-latitude transits of the heliosphere when it observed solar wind shears from the incursions of high-latitude fast solar wind toward the low-latitude slow solar wind. We look for nearly radial field orientations commo…
New Multifractal Analyses of the Solar Wind Turbulence : Rank-Ordered Multifractal Analysis and Generalized Two-scale Weighted Cantor Set Model
Lamy, H.; Wawrzaszek, A.; Macek, W. M. +1 more
Since the work of Burlaga in 1991, various multifractal analyses have been performed to better characterize the intermittency of the fluctuations in the turbulent solar wind. These analyses were based either on the classical structure functions or on the partition function. Recently, two new multifractal analyses have been proposed to better chara…
Kelvin-Helmholtz Multi-Spacecraft Studies at the Earth's Magnetopause Boundaries
Farrugia, C. J.; Fazakerley, A. N.; Owen, C. J. +2 more
The Kelvin-Helmholtz (KH) instability can operate in various situations in the solar wind, but at the boundaries of planetary obstacles, for example the Earth's magnetopause, it is most amenable to investigation. Reliable estimates of wave characteristics are essential for comparison with theoretical and numerical models and for understanding the …