Search Publications
Evidence of Small Scale Plasma Irregularity Effects on Whistler Mode Chorus Propagation
Agapitov, Oleksiy; Hosseini, Poorya; Harid, Vijay +1 more
The impact of randomly distributed field aligned density irregularities on whistler mode wave propagation is investigated using full wave simulations and multipoint spacecraft observations. The irregularities are modeled as randomized density perturbations between 1% and 10% of the nominal background density value with scales of ∼10-60 km transver…
Electron Scale Measurements of Antidipolarization Front
Liu, Chengming; Cao, Jinbin; Fu, Huishan +3 more
Antidipolarization fronts (ADFs), usually formed at the leading edge of the tailward reconnection jets in the Earth's magnetotail, are characterized by sharp enhancements of southward magnetic field (negative Bz). The fine structures at electron scale of the ADFs have not been studied so far, due to instrumental limitations and large se…
Statistical Investigation of the Frequency Dependence of the Chorus Source Mechanism of Plasmaspheric Hiss
Shen, Xiao-Chen; Meredith, Nigel P.; Horne, Richard B. +2 more
We use data from eight satellites to statistically examine the role of chorus as a potential source of plasmaspheric hiss. We find that the strong equatorial (|λm| < 6°) chorus wave power in the frequency range 50 < f < 200 Hz does not extend to high latitudes in any magnetic local time sector and is unlikely to be the source o…
Intense dB/dt Variations Driven by Near Earth Bursty Bulk Flows (BBFs): A Case Study
Dunlop, Malcolm W.; Wei, Dong; Yang, Junying +3 more
During geomagnetically disturbed times the surface geomagnetic field often changes abruptly, producing geomagnetically induced currents (GICs) in a number of ground based systems. There are, however, few studies reporting GIC effects which are driven directly by bursty bulk flows (BBFs) in the inner magnetosphere. In this study, we investigate the…
Configuration of the Earth's Magnetotail Current Sheet
Lin, Yu; Zhang, Xiao-Jia; El-Alaoui, Mostafa +7 more
The spatial scale and intensity of Earth's magnetotail current sheet determine the magnetotail configuration, which is critical to one of the most energetically powerful phenomena in the Earth's magnetosphere, substorms. In the absence of statistical information about plasma currents, theories of the magnetotail current sheets were mostly based on…
Causes of Jets in the Quasi-Perpendicular Magnetosheath
Kajdič, Primož; Raptis, Savvas; Blanco-Cano, Xóchitl +1 more
Magnetosheath jets are currently an important topic in the field of magnetosheath physics. It is thought that 97% of the jets are produced by the shock rippling at quasi-parallel shocks. Recently, large statistical studies of magnetosheath jets have been performed, however, it is not clear whether rippling also produces jets found downstream of qu…
Subion-Scale Flux Rope Nested Inside Ion-Scale Flux Rope in Earth's Magnetotail
Wang, Z.; Liu, Y. Y.; Fu, H. S. +2 more
Magnetic flux ropes (MFRs)—transient magnetic structures widely observed in Earth's magnetosphere—play crucial roles in particle acceleration and energy dissipation. MFRs above ion scale have been well studied, while MFRs at subion scales and their coupling with larger-scale ropes still remains not well understood. In this paper, we present the fi…
On the Persistent Poloidal Alfven Waves
Choi, Jiwon; Lee, Dong-Hun
Standing poloidal Alfven waves, radial oscillations with ultralow frequency of 5-20 mHz, are excited by wave-particle interaction in the magnetosphere. It has been a question over several decades why poloidal oscillations often persist and are not quickly converted into toroidal waves even when there is no corresponding particle source. By adoptin…
The Micro-Macro Coupling of Mass-Loading in Symmetric Magnetic Reconnection With Cold Ions
Hesse, Michael; Spinnangr, Susanne F.; Tenfjord, Paul +4 more
We investigate how magnetic reconnection is influenced by an inflow of a dense cold ion population. We compare two 2.5D Particle-In-Cell simulations, one containing the cold population and one without. We find that the cold population influences the reconnection process on both global and kinetic scales, and that the dominant contribution can be e…