Search Publications
Intense current sheets in the magnetotail: Peculiarities of electron physics
Petrukovich, A. A.; Zelenyi, L. M.; Nakamura, R. +2 more
In this paper we investigate intense (with current density larger than 15 nA/m2) thin (thickness is less than proton gyroradius) horizontal current sheets observed by Cluster in 2003 year in the Earth magnetotail. We compare observed profiles of the curlometer current density with particle currents and analytical estimates. We show that…
Asymmetry of magnetosheath flows and magnetopause shape during low Alfvén Mach number solar wind
Budnik, E.; Dandouras, I.; Lavraud, B. +11 more
works have emphasized the significant influence of the solar wind Alfvén Mach number (MA) on magnetospheric dynamics. Here we report statistical, observational results that pertain to changes in the magnetosheath flow distribution and magnetopause shape as a function of solar wind MA and interplanetary magnetic field (IMF) cl…
Properties of outflow-driven sawtooth substorms
Lyon, J. G.; Rogers, B. N.; Ouellette, J. E. +2 more
The mechanisms by which ionospheric O+ stretches the plasma sheet causing variations in polar cap flux during magnetospheric sawtooth substorms are investigated using the multi-fluid Lyon-Fedder-Mobarry simulation code. O+ outflow is induced in the simulation by Alfvénic Poynting flux flowing to low altitude during the sawtoo…
Evidence from radial velocity measurements of a global electric field in Saturn's inner magnetosphere
Wilson, R. J.; Delamere, P. A.; Bagenal, F. +3 more
The presence of a convection pattern in the Saturnian inner magnetosphere was first observed in moon signatures that were displaced from their expected locations. A noon to midnight directed electric field can account for these positional offsets, and also can explain asymmetries found in plasma temperatures between the day and night sides. By ass…
Determination of local plasma densities with the MARSIS radar: Asymmetries in the high−altitude Martian ionosphere
Fränz, M.; André, M.; Edberg, N. J. T. +6 more
We present a novel method for the automatic retrieval of local plasma density measurements from the Mars advanced radar for subsurface and ionospheric sounding (MARSIS) active ionospheric sounder (AIS) instrument. The resulting large data set is then used to study the configuration of the Martian ionosphere at altitudes above ∼300 km. An empirical…
Energetic neutral atom imaging of the lunar surface
Barabash, S.; Holmström, M.; Futaana, Y. +7 more
Since the Moon is not shielded by a global magnetic field or by an atmosphere, solar wind plasma impinges onto the lunar surface almost unhindered. Until recently, it was assumed that almost all of the impinging solar wind ions are absorbed by the surface. However, recent Interstellar Boundary Explorer, Chandrayaan-1, and Kaguya observations showe…
Hemispheric asymmetries of the Venus plasma environment
Kallio, E.; Jarvinen, R.; Dyadechkin, S.
We study the Venus-solar wind interaction and the hemispheric asymmetries of the Venus plasma environment in the global HYB-Venus hybrid simulation. We concentrate especially on the role of the flow-aligned interplanetary magnetic field (IMF) component (i.e., the Parker spiral angle or the IMF cone angle) and analyze the dawn-dusk and Esw
Full halo coronal mass ejections: Do we need to correct the projection effect in terms of velocity?
Wang, Yuming; Shen, Chenglong; Wang, S. +3 more
The projection effect is one of the biggest obstacles in learning the real properties of coronal mass ejections (CMEs) and forecasting their geoeffectiveness. To evaluate the projection effect, 86 full halo CMEs (FHCMEs) listed in the Coordinated Data Analysis Workshop CME catalog from 1 March 2007 to 31 May 2012 are investigated. By applying the …
Mars ionospheric response to solar wind variability
Fränz, M.; Lester, M.; Edberg, N. J. T. +6 more
planets with induced magnetospheres, the coupling between the ionosphere, the weak draped magnetosphere, and the solar wind is very direct in comparison to Earth. The weak induced magnetosphere itself is created by the prevailing Solar wind conditions and therefore in its shape and strength dynamically depending on it. In early 2010, Mars was loca…
Dynamics of the foreshock compressional boundary and its connection to foreshock cavities
Zhang, H.; Omidi, N.; Sibeck, D. +4 more
We use several global hybrid (kinetic ions, fluid electrons) simulation runs for steady and time-varying interplanetary magnetic field (IMF) conditions to examine the dynamics of the foreshock compressional boundary (FCB) and its connection to foreshock cavities. The results demonstrate that for steady IMF conditions, the FCB forms and evolves ove…