Search Publications
Annual variations in the Martian bow shock location as observed by the Mars Express mission
Holmström, M.; Fränz, M.; Lester, M. +12 more
The Martian bow shock distance has previously been shown to be anticorrelated with solar wind dynamic pressure but correlated with solar extreme ultraviolet (EUV) irradiance. Since both of these solar parameters reduce with the square of the distance from the Sun, and Mars' orbit about the Sun increases by ∼0.3 AU from perihelion to aphelion, it i…
Hall effect control of magnetotail dawn-dusk asymmetry: A three-dimensional global hybrid simulation
Artemyev, A. V.; Pritchett, P. L.; Wang, X. Y. +4 more
Magnetotail reconnection and related phenomena (e.g., flux ropes, dipolarizing flux bundles, flow bursts, and particle injections) occur more frequently on the duskside than on the dawnside. Because this asymmetry can directly result in dawn-dusk asymmetric space weather effects, uncovering its physical origin is important for better understanding…
Time-dependent magnetohydrodynamic simulations of the inner heliosphere
Merkin, V. G.; Lyon, J. G.; Lario, D. +2 more
This paper presents results from a simulation study exploring heliospheric consequences of time-dependent changes at the Sun. We selected a 2 month period in the beginning of year 2008 that was characterized by very low solar activity. The heliosphere in the equatorial region was dominated by two coronal holes whose changing structure created temp…
Suprathermal electrons near the nucleus of comet 67P/Churyumov-Gerasimenko at 3 AU: Model comparisons with Rosetta data
Henri, P.; Edberg, N. J. T.; Goldstein, R. +10 more
Observations of the coma near the nucleus of comet 67P/Churyumov-Gerasimenko (67P) made by the IES (Ion and Electron Sensor) instrument onboard the Rosetta Orbiter during late 2014 showed that electron fluxes greatly exceeded solar wind electron fluxes. The IES is part of the Rosetta Plasma Consortium. This paper reports on electron energy spectra…
Solar cycle variations in the ionosphere of Mars as seen by multiple Mars Express data sets
Pätzold, M.; Lester, M.; Milan, S. E. +11 more
The response of the Martian ionosphere to solar activity is analyzed by taking into account variations in a range of parameters during four phases of the solar cycle throughout 2005-2012. Multiple Mars Express data sets have been used (such as Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) in Active Ionospheric Sounding, MARS…
Impacts of spontaneous hot flow anomalies on the magnetosheath and magnetopause
Berchem, J.; Zhang, H.; Omidi, N. +1 more
Spacecraft observations and global hybrid (kinetic ions and fluid electrons) simulations have demonstrated that ion dissipation processes at the quasi-parallel bow shock are associated with the formation of structures called spontaneous hot flow anomalies (SHFAs). Previous simulations and recent spacecraft observations have also established that S…
A statistical study of EMIC waves observed by Cluster: 2. Associated plasma conditions
André, M.; Klecker, B.; Kistler, L. M. +6 more
This is the second in a pair of papers discussing a statistical study of electromagnetic ion cyclotron (EMIC) waves detected during 10 years (2001-2010) of Cluster observations. In the first paper, an analysis of EMIC wave properties (i.e., wave power, polarization, normal angle, and wave propagation angle) is presented in both the magnetic latitu…
An EMHD soliton model for small-scale magnetic holes in magnetospheric plasmas
Pu, Zu-Yin; Xiao, Chi-Jie; Fu, Sui-Yan +6 more
Small-scale magnetic holes (SSMHs) in the magnetosphere plasma sheet are investigated in this paper. A developed electron magnetohydrodynamics (EMHD) soliton model is proposed as a new approach to SSMHs formation. The Biermann battery effect is taken into account in resolving the magnetic evolution equation with a slow-mode solution in the weak no…
Electron heating in the exhaust of magnetic reconnection with negligible guide field
Guo, Ruilong; Chen, Li-Jen; Kistler, Lynn M. +3 more
Electron heating in the magnetic reconnection exhaust is investigated with particle-in-cell simulations, space observations, and theoretical analysis. Spatial variations of the electron temperature (Te) and associated velocity distribution functions (VDFs) are examined and understood in terms of particle energization and randomization p…
Slow electrostatic solitary waves in Earth's plasma sheet boundary layer
Fazakerley, Andrew; Omura, Yoshiharu; Anekallu, Chandrasekhar +3 more
We modeled Cluster spacecraft observations of slow electrostatic solitary waves (SESWs) in the Earth's northern plasma sheet boundary layer (PSBL) region on the basis of nonlinear fluid theory and fluid simulation. Various plasma parameters observed by the Cluster satellite at the time of the SESWs were examined to investigate the generation proce…