Search Publications
Statistical study of the quasi-perpendicular shock ramp widths
Krasnoselskikh, V.; Gedalin, M.; Hobara, Y. +2 more
The width of the collisionless shock front is one of the key shock parameters. The width of the main shock transition layer is related to the nature of the collisionless process that balances nonlinearity and therefore leads to the formation of the shock itself. The shock width determines how the incoming plasma particles interact with the macrosc…
Rate of radial transport of plasma in Saturn's inner magnetosphere
Wilson, R. J.; Chen, Y.; Hill, T. W. +1 more
In the inner part of a rapidly rotating magnetosphere such as that of Saturn, the major observable signature of radial plasma convection is a series of longitudinally localized injections and simultaneous drift dispersions of hot tenuous plasma from the outer magnetosphere. The Cassini Plasma Spectrometer (CAPS) and the Cassini Magnetospheric Imag…
Wave properties in the magnetic reconnection diffusion region with high β: Application of the k-filtering method to Cluster multispacecraft data
Sahraoui, F.; Deng, X. H.; Wang, J. F. +6 more
Magnetic reconnection is a crucial physical process in laboratory and astrophysical plasmas. Plasma waves are believed to provide the dissipation mechanism in magnetic reconnection. In this paper we analyze the properties of low-frequency waves in a magnetotail reconnection diffusion region with a small guide field and high β. Using the k-filterin…
Magnetosonic Mach number effect of the position of the bow shock at Mars in comparison to Venus
Barabash, S.; Fränz, M.; Lester, M. +3 more
We study the effect of the magnetosonic Mach number on the position of the bow shock (BS) at Mars. The magnetosonic Mach number is calculated from solar wind data obtained by the ACE satellite upstream of Earth and extrapolated to Mars during two intervals, starting in 2005 and 2007, when Mars and Earth were close to opposition. An increased Mach …
Cosmic ray diffusion tensor throughout the heliosphere
Matthaeus, W. H.; Bieber, J. W.; Burger, R. A. +3 more
We calculate the cosmic ray diffusion tensor based on a recently developed model of magnetohydrodynamic (MHD) turbulence in the expanding solar wind. Parameters of this MHD model are tuned by using published observations from Helios, Voyager 2, and Ulysses. We present solutions of two turbulence parameter sets and derive the characteristics of the…
On the origin of Saturn's outer auroral emission
Gérard, Jean-Claude; Grodent, Denis; Radioti, Aikaterini +1 more
Ultraviolet Hubble Space Telescope images reveal a faint but distinct auroral emission equatorward of the main ring of emission of Saturn's southern polar region. This outer auroral emission is only visible near the nightside limb for the strongly tilted viewing geometry achieved in January 2004. We model the limb-brightening amplification of this…
Modeling ULF waves in a compressed dipole magnetic field
Rae, I. J.; Rankin, R.; Degeling, A. W. +2 more
This paper presents the results of a linear model for global scale magneto-hydrodynamic (MHD) waves in a compressed dipole model magnetosphere. We examine scenarios where a localized monochromatic source along the magnetopause boundary launches MHD fast mode ultralow frequency (ULF) waves into the magnetosphere, where they couple to shear Alfvén w…
Magnetic field dipolarization in the deep inner magnetosphere and its role in development of O+-rich ring current
Keika, K.; Koshiishi, H.; Matsumoto, H. +5 more
We studied magnetic field dipolarization and associated ion acceleration in the deep inner magnetosphere, using magnetic field data obtained by the magnetometer on board the Mission Demonstration Satellite 1 (MDS-1) and the energetic neutral atom (ENA) flux data obtained by the high-energy neutral analyzer imager on board the Imager for Magnetopau…
Total electron content in the Mars ionosphere: Temporal studies and dependence on solar EUV flux
Withers, Paul; Safaeinili, Ali; Brain, David A. +3 more
Total electron content (TEC) derived from radar signal distortions is a useful tool in probing the ionosphere of Mars. We consider 26 months of data from the subsurface mode of the Mars Express MARSIS instrument and confirm that the TEC dependence on solar zenith angle (SZA) approximately matches Chapman theory. After detrending this dependence, w…
Self-consistent inner magnetosphere simulation driven by a global MHD model
Tóth, G.; Welling, D.; Jordanova, V. K. +1 more
We present results from a one-way coupling between the kinetic Ring Current Atmosphere Interactions Model with Self-Consistent B field (RAM-SCB) and the Space Weather Modeling Framework (SWMF). RAM-SCB obtains plasma distribution and magnetic field at model boundaries from the Block Adaptive Tree Solar Wind Roe Upwind Scheme (BATS-R-US) magnetohyd…