Search Publications
Electrostatic and electromagnetic fluctuations detected inside magnetic flux ropes during magnetic reconnection
Wang, Shui; Li, Xing; Huang, Can +6 more
A series of magnetic flux ropes embedded in the ion diffusion region of a magnetotail magnetic reconnection event were investigated in this paper. Waves near the lower hybrid frequency were measured within each of the flux ropes and can be associated with the enhancements of energetic electrons in some of the flux ropes. The waves in the largest f…
Characteristics of quasi-monochromatic ULF waves in the Venusian foreshock
Zhang, Tielong; Mazelle, Christian; Lu, Quanming +5 more
The statistical properties of ULF waves observed upstream of Venus foreshock are investigated. The study is restricted to waves which are observed well below the local proton cyclotron frequency. Using the magnetic field observations from Venus Express between May 2006 and February 2012, 115 quasi-monochromatic ULF wave trains have been identified…
Statistical features of the global polarity reversal of the Venusian induced magnetosphere in response to the polarity change in interplanetary magnetic field
Nilsson, Hans; Zhang, Tielong; Edberg, Niklas J. T. +5 more
In this study we present the first statistical analysis on the effects of heliospheric current sheet crossings on the induced magnetosphere of Venus. These events are of particular interest because they lead to the reconfiguration of the induced magnetosphere with opposite polarity. We use a statistical approach based on 117 orbit pairs, and we st…
The "Alfvénic surge" at substorm onset/expansion and the formation of "Inverted Vs": Cluster and IMAGE observations
Frey, H. U.; Goldstein, M. L.; Mozer, F. S. +4 more
From multipoint, in situ observations and imaging, we reveal the injection-powered, Alfvénic nature of auroral acceleration during onset and expansion of a substorm. It is shown how Alfvénic variations over time dissipate to form large-scale, inverted-V structures characteristic of quasistatic aurora. This characterization is made possible through…
Pulsations of the polar cusp aurora at Saturn
Krupp, N.; Roussos, E.; Mitchell, D. G. +4 more
The magnetospheric cusp is a region connecting the interplanetary environment to the ionosphere and enabling solar wind particles to reach the ionosphere. We report the detection of several isolated high-latitude auroral emissions with the Ultraviolet Imaging Spectrograph of the Cassini spacecraft. We suggest that these auroral spots, located in t…
Variation of Jupiter's aurora observed by Hisaki/EXCEED: 1. Observed characteristics of the auroral electron energies compared with observations performed using HST/STIS
Tsuchiya, Fuminori; André, Nicolas; Fujimoto, Masaki +9 more
Temporal variation of Jupiter's northern aurora is detected using the Extreme Ultraviolet Spectroscope for Exospheric Dynamics (EXCEED) on board JAXA's Earth-orbiting planetary space telescope Hisaki. The wavelength coverage of EXCEED includes the H2 Lyman and Werner bands at 80-148 nm from the entire northern polar region. The prominen…
Modeling the magnetospheric X-ray emission from solar wind charge exchange with verification from XMM-Newton observations
Palmroth, Minna; Milan, Steve E.; Carter, Jennifer A. +3 more
An MHD-based model of terrestrial solar wind charge exchange (SWCX) is created and compared to 19 case study observations in the 0.5-0.7 keV emission band taken from the European Photon Imaging Cameras on board XMM-Newton. This model incorporates the Global Unified Magnetosphere-Ionosphere Coupling Simulation-4 MHD code and produces an X-ray emiss…
Cassini plasma observations of Saturn's magnetospheric cusp
Coates, Andrew J.; Krupp, Norbert; Arridge, Christopher S. +6 more
The magnetospheric cusp is a funnel-shaped region where shocked solar wind plasma is able to enter the high-latitude magnetosphere via the process of magnetic reconnection. The plasma observations include various cusp signatures such as ion energy dispersions and diamagnetic effects. We present an overview analysis of cusp plasma observations at t…
Challenges associated with near-Earth nightside current
Liemohn, Michael W.; Welling, Daniel T.; Ilie, Raluca +1 more
Every magnetic field of solar and planetary space environments is associated with a current of differentially flowing charged particles. Electric potential patterns in geospace and near other planets are also closely linked with currents. Close to the Earth, particularly in the near-Earth nightside magnetosphere, several current systems wax and wa…
Polytropic index of magnetosheath ions based on homogeneous MHD Bernoulli Integral
Ma, Yuduan; Cao, Jinbin; Pang, Xuexia
This paper uses Cluster data during the period from 2001 to 2010 to study the polytropic processes of magnetosheath ions. Utilizing the method of homogeneous magnetohydrodynamic (MHD) Bernoulli integral (MBI), we first identify streamflow tubes, then use the constant of polytropic relation to guarantee that the streamflow tube experiences an uncha…