Search Publications
Heliospheric energetic particle observations during the October-November 2003 events
Livi, S.; Russell, C. T.; Lario, D. +4 more
The intense level of solar activity recorded from 19 October to 12 November 2003 led to unusually high energetic particle intensities observed throughout the heliosphere. The fleet of spacecraft distributed in the inner and outer heliosphere offers us the opportunity to study both the effects of these events in different regions of the heliosphere…
Reconstruction of the reconnection rate from Cluster measurements: First results
Penz, T.; Kubyshkin, I. V.; Nakamura, R. +6 more
A model of transient time-dependent magnetic reconnection is used to describe the behavior of nightside flux transfers (NFTEs) in the Earth's magnetotail. On the basis of the analytical approach to reconnection developed by Heyn and Semenov (1996) and Semenov et al. (2004a) we calculate the magnetic field and plasma bulk velocity time series obser…
Solar energetic electrons related to the 28 October 2003 flare
Krucker, S.; Mann, G.; Kunow, H. +4 more
We investigate the solar origin of near-relativistic electrons and protons during the X17.2/4B flare as observed by the Comprehensive Suprathermal and Energetic Particle Analyser (COSTEP) and Three-Dimensional Plasma (3DP) analyzer experiments on board the SOHO and Wind spacecraft. These observations are combined with ground- and space-based spect…
The k-filtering technique applied to wave electric and magnetic field measurements from the Cluster satellites
Sahraoui, Fouad; André, Mats; Cornilleau-Wehrlin, Nicole +2 more
The k-filtering technique is a method to characterize stationary fluctuations in space plasmas in terms of the wave energy distribution in the frequency and wave vector space. It has the ability to distinguish between wave modes of the same frequency in the spacecraft frame of reference, but with different wave vectors. This method is based on sim…
Prediction and understanding of the north-south displacement of the heliospheric current sheet
Hoeksema, J. T.; Scherrer, P. H.; Zhao, X. P.
On the basis of Wilcox Solar Observatory observations of the photospheric magnetic field and the potential field-source surface model, we compare the solid angles occupied by the positive source surface field with that of the negative. We develop an algorithm to quantitatively estimate and understand the positive-negative displacement of the helio…
Orientation and motion of two-dimensional structures in a space plasma
Hasegawa, H.; Sonnerup, B. U. Ã. -.
We present a new least squares technique for the determination of axis orientation, motion, and intrinsic axial electric field for two-dimensional coherent structures in a space plasma. This single-spacecraft method is based on Faraday's law, which, under the model assumptions, requires the intrinsic axial electric field to be constant in space an…
Computing the reconnection rate at the Earth's magnetopause using two spacecraft observations
RèMe, H.; Owen, C. J.; Fuselier, S. A. +2 more
A new multispacecraft technique is introduced which, under some restrictive assumptions and conditions, provides a snapshot of the reconnection inflow velocity into the magnetosphere and an estimate of the distance from the spacecraft to the reconnection site. The two quantities are not obtained independent of one another and additional, independe…
Examination of type II origin with SOHO/LASCO observations
Cho, K. -S.; Kim, Y. -H.; Moon, Y. -J. +5 more
We examine a possibility that metric type II solar radio bursts are all caused by coronal mass ejection (CME) generated shocks. For this we consider 129 type II flare events from February 1997 to October 2000 and examine their associations with SOHO/LASCO CMEs according to their temporal and spatial closeness using SOHO/EIT and GOES data. We then …
Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations
Krasnoselskikh, V.; Dudok de Wit, T.; Soucek, J. +2 more
The intense high-frequency electrostatic waves observed in the terrestrial foreshock often have a form of a superposition of two monochromatic waves close to the plasma frequency. We suggest an interpretation of these spectra as signatures of nonlinear decay of Langmuir waves to electron-sound and ion-sound secondary waves. This decay instability …
October/November 2003 interplanetary coronal mass ejections: ACE/EPAM solar energetic particle observations
Lario, D.; Lanzerotti, L. J.; Sarris, E. T. +3 more
In late October and early November 2003 the ACE spacecraft at 1 AU detected two shock-associated interplanetary coronal mass ejections (ICMEs). In the sheath region formed in front of both ICMEs, some of the highest speeds ever directly measured in the solar wind were observed. We analyze in detail the energetic particle signatures measured at 1 A…