Search Publications
Hall magnetohydrodynamic effects for three-dimensional magnetic reconnection with finite width along the direction of the current
Nakamura, R.; Kubota, Y.; Nakamura, T. K. M. +2 more
We performed three-dimensional Hall magnetohydrodynamic (MHD) simulations of magnetic reconnection with finite width along the direction perpendicular to the antiparallel magnetic field (i.e., the direction of the electric current). Previous similar simulations including the Hall term have shown that the localized reconnection region itself can br…
Adiabatic electron heating in the magnetotail current sheet: Cluster observations and analytical models
Petrukovich, A. A.; Zelenyi, L. M.; Nakamura, R. +1 more
We consider the electron distribution in current sheets observed by Cluster mission in the Earth magnetotail. We use the statistics of 70 fast (less than 20 minutes) and 12 slow (more than one hour) crossings of horizontal current sheets. We demonstrate that for both types electron temperature decreases with increase of magnetic field ∣Bx
Analysis of Cassini magnetic field observations over the poles of Rhea
Dougherty, Michele K.; Saur, Joachim; Kriegel, Hendrik +5 more
We analyze Cassini magnetic field observations from the only two polar flybys of Saturn's largest icy satellite Rhea (R2 on 02 March 2010 and R3 on 11 January 2011) which are scheduled between Saturn Orbit Insertion and the end of the mission in 2017. For the interpretation of these data, we apply estimations from simple analytical models as well …
Profile of strong magnetic field By component in magnetotail current sheets
Petrukovich, A. A.; Zhang, T. L.; Lucek, E. +8 more
The strong magnetic field By component (in GSM coordinates) has been increasingly noticed to play an important role in the dynamics of tail current sheet (CS). The distribution profile of strong By components in the tail CS (i.e., those with guide field), however, is not well known. In the present work, by using the simultane…
Characteristics of precipitating energetic ions/electrons associated with the wave-particle interaction in the plasmaspheric plume
Yuan, Zhigang; Deng, Xiaohua; Wang, Dedong +5 more
In this paper, we present characteristics of precipitating energetic ions/electrons associated with the wave-particle interaction in the plasmaspheric plume during the geomagnetic storm on July 18, 2005 with observations of the NOAA15 NOAA16, IMAGE satellites and Finnish network of search coil magnetometers. Conjugate observations of the NOAA15 sa…
Acceleration of radiation belts electrons by oblique chorus waves
Krasnoselskikh, V.; Agapitov, O.; Artemyev, A. +1 more
The redistribution of energy during the recovery phase of geomagnetic storms related to the acceleration of electrons in the Earth's outer radiation belt by cyclotron-resonant chorus waves is an important and challenging topic of magnetospheric plasma physics. An approximate analytical formulation of energy diffusion coefficients is derived in thi…
An MHD simulation model of time-dependent co-rotating solar wind
Hayashi, K.
We present a treatment of observation-based time-dependent boundary conditions for the inner boundary sphere in the time-dependent three-dimensional MHD simulations of the global solar wind. With this boundary treatment, we obtain super-Alfvenic MHD solutions of time-dependent co-rotating solar wind structures. The boundary variables on the inner …
A statistical study of the cross-shock electric potential at low Mach number, quasi-perpendicular bow shock crossings using Cluster data
Bale, S. D.; Walker, S. N.; Balikhin, M. A. +3 more
The cross-shock electrostatic potential at the front of collision-less shocks plays a key role in the distribution of energy at the shock front. Multipoint measurements such as those provided by the Cluster II mission provide an ideal framework for the study of the cross-shock potential because of their ability to distinguish between temporal and …
Dependence of solar proton events on their associated activities: Coronal mass ejection parameters
Moon, Y. -J.; Gopalswamy, N.; Park, J.
In this study we have examined the occurrence probability of solar proton events (SPEs) and their peak fluxes depending on coronal mass ejection (CME) parameters, linear speed (V), angular width (AW), and location (L). For this we used the NOAA SPE list and their associated CME data from 1997 to 2006. We found that the probability strongly depends…
Numerical simulation of the effects of a solar energetic particle event on the ionosphere of Mars
Simon Wedlund, C.; Haider, S. A.; Withers, Paul +5 more
We investigate the ionospheric effects of a solar energetic particle (SEP) event at Mars, specifically the 29 September 1989 event. We use its energy spectrum and a steady state ionospheric model to simulate vertical profiles of ion and electron densities. The ionospheric response to this large event would have been readily observable. It caused e…