Search Publications
Equatorial Propagation of the Magnetosonic Mode Across the Plasmapause: 2-D PIC Simulations
Boardsen, Scott A.; Liu, Kaijun; Denton, Richard E. +2 more
Recent studies have indicated that fast magnetosonic waves (also referred to as equatorial noise) excited far outside the plasmapause cannot propagate deep into the plasmasphere because of the preferential azimuthal propagation of the waves at the source region. Since conditions in the low-density plasma trough are typically favorable for the wave…
Saturn's Plasmapause: Signature of Magnetospheric Dynamics
Coates, A. J.; Thomsen, M. F.
We explore the paradigm that Saturn's plasmapause marks the boundary between the magnetic flux tubes that have been circulating around the planet for some time, accumulating a dense load of Enceladus-sourced material, and those that have recently undergone tail reconnection, shedding the bulk of the cold plasma and retaining a more tenuous, heated…
Earth's Bow Shock: A New Three-Dimensional Asymmetric Model With Dipole Tilt Effects
Wang, M.; Ma, X.; Zhou, Y. +3 more
Using the bow shock crossing events from four spacecraft: IMP 8, Geotail, Magion-4, and Cluster 1, a new three-dimensional asymmetric bow shock model is constructed. The model is parameterized by the solar wind dynamic pressure, the interplanetary magnetic field, magnetosonic Mach number, solar wind β, and the Earth's dipole tilt angle. It is show…
The Structure of Planetary Period Oscillations in Saturn's Equatorial Magnetosphere: Results From the Cassini Mission
Wahlund, J. -E.; Andrews, D. J.; Cowley, S. W. H. +4 more
Saturn's magnetospheric magnetic field, planetary radio emissions, plasma populations, and magnetospheric structure are all known to be modulated at periods close to the assumed rotation period of the planetary interior. These oscillations are readily apparent despite the high degree of axisymmetry in the internally produced magnetic field of the …
Kinetic Analysis of the Energy Transport of Two-Flow Components in the Plasma Sheet
Cao, Jin-Bin; Ren, Ganming; Ma, Yuduan
Satellite observations indicate that multiple components often exist in the plasma sheet, particularly during impulsive fast flow events. In this paper, we perform a kinetic analysis of the energy transport of plasma sheet ion flow using a model of two-component plasma sheet ion flows (Background convection flow represented by subscript "b" and Fa…
Field-Aligned Structures of the Poloidal-Mode ULF Wave Electric Field: Phase Relationship Implications
Zong, Q. G.; Ren, Jie; Zhou, X. Z. +2 more
Spacecraft observations within recent decades have demonstrated that ultralow frequency (ULF) waves play an important role in the dynamics of Earth's magnetosphere through drift and/or drift-bounce resonance with different particle species. The phase relationship between resonant particles and waves can help us understand the wave-particle interac…
Local Time Variation in the Large-Scale Structure of Saturn's Magnetosphere
Dougherty, M. K.; Arridge, C. S.; Guio, P. +3 more
The large-scale structure of Saturn's magnetosphere is determined by internal and external factors, including the rapid planetary rotation rate, significant internal hot and cold plasma sources, and varying solar wind pressure. Under certain conditions the dayside magnetospheric magnetic field changes from a dipolar to more disk-like structure, du…
Empirical Modeling of the Geomagnetosphere for SIR and CME-Driven Magnetic Storms
Tsyganenko, N. A.; Andreeva, V. A.
During geomagnetic disturbances, the solar wind arrives in the form of characteristic sequences lasting from tens of hours to days. The most important magnetic storm drivers are the coronal mass ejections (CMEs) and the slow-fast stream interaction regions (SIRs). Previous data-based magnetic field models did not distinguish between these types of…
Multiband Study of a Bidirectional Jet Occurred in the Upper Chromosphere
Reeves, Katharine K.; Ni, Lei; Lin, Jun +3 more
We present a study of a jet observed by the Solar Dynamics Observatory (SDO) and the Interface Region Imaging Spectrograph (IRIS), which provide high spatial-temporal resolution observational data of (extreme) ultraviolet images, spectra, and magnetograms. The jet was observed in multiple bands of AIA and manifested clear bidirectional flows in IR…
Extremely High Plasma Densities in the Mars Ionosphere Associated With Cusp-Like Magnetic Fields
Fallows, K.; Withers, P.; Kopf, A. +1 more
The Martian crustal magnetic field modifies the structure of the ionosphere, the loss of atmosphere to space, and the interactions of the upper atmosphere with the solar wind. The Mars Advanced Radar for Subsurface and Ionosphere Sounding topside sounder on Mars Express has regularly observed oblique echoes from magnetically controlled plasma stru…