Search Publications
Identifying 3-D Vortex Structures At/Around the Magnetopause Using a Tetrahedral Satellite Configuration
Lembège, B.; Hasegawa, H.; Cai, D. +1 more
Identifying vortices is the key to understanding the turbulence in plasma shear layers. This paper aims to provide general guidelines for identifying 3-D vortex structures. Currently, no single precise definition of a vortex is universally accepted, despite the significance of vortices in fluid and plasma dynamics. Recently, various vortex identif…
Oxygen Ion Reflection at Earthward Propagating Dipolarization Fronts in the Magnetotail
Parks, G. K.; Sun, W. J.; Fu, S. Y. +7 more
A dipolarization front (DF) is known as the leading edge of an earthward high-speed flow with a sharp enhancement in the northward magnetic field (Bz). Analysis of an event observed by Cluster shows that the behavior of oxygen ions (O+) around the DF is very different from protons (H+). After the crossing of the DF…
Four-Spacecraft Magnetic Curvature and Vorticity Analyses on Kelvin-Helmholtz Waves in MHD Simulations
Lavraud, Benoit; Kieokaew, Rungployphan; Foullon, Claire
Four-spacecraft missions are probing the Earth's magnetospheric environment with high potential for revealing spatial and temporal scales of a variety of in situ phenomena. The techniques allowed by these four spacecraft include the calculation of vorticity and the magnetic curvature analysis (MCA), both of which have been used in the study of var…
On the Asymmetry Between Upward and Downward Field-Aligned Currents Interacting With the Ionosphere
Streltsov, A. V.
The paper presents results from the numerical study of the magnetosphere-ionosphere interactions driven by the large-scale electric field in the magnetically conjugate, high-latitude regions of northern and southern hemispheres. Simulations of the two-fluid MHD model demonstrate that these interactions can lead to a generation of a system of small…
Saturn's Northern Auroras and Their Modulation by Rotating Current Systems During Late Northern Spring in Early 2014
Lamy, L.; Badman, S. V.; Cowley, S. W. H. +3 more
The Hubble Space Telescope imaged Saturn's northern ultraviolet auroras during February-June 2014, when Saturn's northern and southern magnetic perturbation fields were locked in antiphase and matched in rotation period ( 10.69 hr). During this coalescence period, we test for evidence of rotational modulation of the auroras using the latest rotati…
Properties of the HPS-ICME-CIR Interaction Event of 9-10 September 2011
Morgan, Huw; Al-Shakarchi, Duraid A.
During 9-10 September 2011 the ACE, Wind, and SOHO spacecraft measured the complex interaction between an interplanetary coronal mass ejection (ICME) and a corotating interaction region (CIR) associated with the heliospheric sector boundary. Except for a few short periods, the suprathermal electrons are unidirectional, suggesting that the ICME mag…
The Periodic Flapping and Breathing of Saturn's Magnetodisk During Equinox
Dougherty, M. K.; Arridge, C. S.; Guio, P. +3 more
Periodic variations have been observed in many field and particle properties in Saturn's magnetosphere, modulated at a period close to the planetary rotation rate. Magnetic field observations by Cassini's magnetometer instrument suggest that in the outer magnetosphere (beyond ∼12 Saturn radii) Saturn's current sheet is periodically displaced with …
Equatorial Noise With Quasiperiodic Modulation: Multipoint Observations by the Van Allen Probes Spacecraft
Hospodarsky, G. B.; Kurth, W. S.; Santolík, O. +2 more
Electromagnetic wave measurements performed by the two Van Allen Probes spacecraft are used to analyze equatorial noise emissions with a quasiperiodic modulation of the wave intensity. These waves are confined to the vicinity of the geomagnetic equator, and they occur primarily on the dayside. In situ plasma number density measurements are used to…
Magnetically Controlled Density Structures in the Martian Ionosphere: Are they Stably Recurring?
Venkateswara Rao, N.; Mohanamanasa, P.; Rao, S. V. B. +1 more
MARSIS instrument aboard the Mars Express spacecraft regularly detects the magnetically controlled density structures (MCDSs) in the Martian ionosphere. In this paper, we studied the recurrence characteristics of these MCDSs using long-term (more than a decade) MARSIS observations over a selected region of 35° to 40° longitude and -10° to 10° lati…
Estimating the Kinetic Energy Budget of the Polar Wind Outflow
Wei, Y.; Nilsson, H.; André, M. +7 more
Ionospheric outflow from the polar cap through the polar wind plays an important role in the evolution of the atmosphere and magnetospheric dynamics. Both solar illumination and solar wind energy input are known to be energy sources of the polar wind. However, observational studies of the energy transfer from these two energy sources to the polar …