Search Publications
Transmission of an ICME Sheath Into the Earth's Magnetosheath and the Occurrence of Traveling Foreshocks
Pulkkinen, Tuija I.; Dimmock, Andrew P.; Turc, Lucile +4 more
The transmission of a sheath region driven by an interplanetary coronal mass ejection into the Earth's magnetosheath is studied by investigating in situ magnetic field measurements upstream and downstream of the bow shock during an ICME sheath passage on 15 May 2005. We observe three distinct intervals in the immediate upstream region that include…
Magnetic Reconnection Within the Boundary Layer of a Magnetic Cloud in the Solar Wind
Nakamura, Rumi; Narita, Yasuhito; Vörös, Zoltán. +5 more
The twisted local magnetic field at the front or rear regions of the magnetic clouds (MCs) associated with interplanetary coronal mass ejections (ICMEs) is often nearly opposite to the direction of the ambient interplanetary magnetic field. There is also observational evidence for magnetic reconnection (MR) outflows occurring within the boundary l…
A General Algorithm for the Linear and Quadratic Gradients of Physical Quantities Based on 10 or More Point Measurements
Dunlop, M.; Shen, Chao; Pu, Zuyin +3 more
A novel algorithm for estimating both the linear and quadratic gradients of physical quantities based on multiple spacecraft observations using the least squares method is put forward. Using 10 or more spacecraft constellation measurements as input, this new algorithm can yield both the linear and quadratic gradients at the barycenter of the const…
Shock Mach Number Estimates Using Incomplete Measurements
Russell, Christopher T.; Dimmock, Andrew P.; Gedalin, Michael
The Mach number is one of the most important parameters of collisionless shocks. The accuracy of its observational determination is compromised by several complications. Incomplete measurements of plasma parameters significantly contribute to the uncertainty, along with the errors of the normal determination. A set of CLUSTER observed shocks is an…
Multi Spacecraft Measurement of Anisotropic Spatial Correlation Functions at Kinetic Range in the Magnetosheath Turbulence
Zhang, J.; Deng, X. H.; Huang, S. Y. +9 more
We investigate spatial correlation functions (SCFs) at kinetic range in the terrestrial magnetosheath because of wide angular distributions of the magnetic field fluctuations and the high Signal to Noise Ratio. We employ four point measurements of magnetic fluctuations from the Cluster and MMS concerning a spatiotemporally varying background magne…
Nonlinear Magnetic Gradients and Complete Magnetic Geometry From Multispacecraft Measurements
Russell, C. T.; Rong, Zhaojin; Shen, Chao +8 more
Topological configurations of the magnetic field play key roles in the dynamics of space plasmas. This study presents a novel algorithm that can estimate the quadratic magnetic gradient as well as the complete geometrical features of magnetic field lines, based on magnetic field and current density measurements by a multiple spacecraft constellati…
Reconstruction Test of Turbulence Power Spectra in 3D Wavenumber Space with at Most 9 Virtual Spacecraft Measurements
He, Jiansen; Feng, Xueshang; Zhang, Lei +1 more
The k filtering/wave telescope method has been successfully applied to the 4 spacecraft measurements from Cluster II and MMS, revealing the four dimensional power spectral density (PSD, ω, k). As the number of spacecraft within a constellation increases, the geometry becomes more complicated, and it is harder to find the first Brillouin like zone,…
The Wave Origins of Longitudinal Structures in ExoMars Trace Gas Orbiter (TGO) Aerobraking Densities
González-Galindo, Francisco; Forget, Francois; Forbes, Jeffrey M. +4 more
The nature and origins of longitudinal density structures in Mars' thermosphere between 100 and 120 km altitude, and -30° and -75° latitude around winter solstice (Ls = 70-122°), as measured by the accelerometer on the ExoMars Trace Gas Orbiter (TGO) Mission, are investigated. The methodology consists of deducing the responsible waves by comparing…
Determining Threshold Instrumental Resolutions for Resolving the Velocity Space Signature of Ion Landau Damping
Klein, K. G.; Verniero, J. L.; Howes, G. G. +1 more
Unraveling the physics of the entire turbulent cascade of energy in space and astrophysical plasmas from the injection of energy at large scales to the dissipation of that energy into plasma heat at small scales, represents an overarching, open question in heliophysics and astrophysics. The fast cadence and high phase space resolution of particle …
Cluster Observations of Energetic Electron Acceleration Within Earthward Reconnection Jet and Associated Magnetic Flux Rope
Daly, P. W.; Vaivads, A.; Khotyaintsev, Yu. V. +3 more
We study acceleration of energetic electrons in an earthward plasma jet due to magnetic reconnection in the Earth magnetotail for one case observed by Cluster. The case has been selected based on the presence of high fluxes of energetic electrons, Cluster being in the burst mode and Cluster separation being around 1,000 km that is optimal for stud…