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Planetary Period Oscillations in Saturn's Magnetosphere: Cassini Magnetic Field Observations Over the Northern Summer Solstice Interval
Dougherty, M. K.; Cowley, S. W. H.; Bunce, E. J. +3 more
We determine properties of Saturn's planetary period oscillations from Cassini magnetic measurements over the 2-year interval from September 2015 to end of mission in September 2017, spanning Saturn northern summer solstice in May 2017. Phases of the northern system oscillations are derived over the whole interval, while those of the southern syst…
Electromagnetic Electron Cyclotron Instability in the Solar Wind
Lazar, M.; Yoon, P. H.; López, R. A. +1 more
The abundant reports on the existence of electromagnetic high-frequency fluctuations in space plasmas have increased the expectations that theoretical modeling may help understand their origins and implications (e.g., kinetic instabilities and dissipation). This paper presents an extended quasi-linear approach of the electromagnetic electron cyclo…
Long-Lasting Poloidal ULF Waves Observed by Multiple Satellites and High-Latitude SuperDARN Radars
Shi, X.; Nishimura, Y.; Angelopoulos, V. +6 more
Poloidal ultralow frequency (ULF) waves between 5 and 10 mHz were observed by multiple satellites and three high-latitude Super Dual Auroral Radar Network radars during the recovery phase of a moderate geomagnetic storm on 24-27 January 2016. The long-lasting ULF waves were observed in the magnetic field and energetic particle flux perturbations d…
Large-Scale Survey of the Structure of the Dayside Magnetopause by MMS
Russell, C. T.; Lavraud, B.; Baumjohann, W. +13 more
This paper describes the generation and initial utilization of a database containing 80 vector and scalar quantities, for a total of 8,670 magnetopause and magnetosheath current sheet crossings by MMS1, using plasma and magnetic field data from the Fast Plasma Investigation, Fluxgate Magnetometer, and Hot Plasma Composition Analyzer instruments, a…
How the IMF By Induces a Local By Component During Northward IMF Bz and Characteristic Timescales
Snekvik, K.; Østgaard, N.; Tenfjord, P. +7 more
We use the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) By component on the coupling between the solar wind and magnetosphere-ionosphere system when IMF Bz>0. We describe the evolution of how a magnetospheric By component is induced on clos…
Oxygen Ion Energization at Mars: Comparison of MAVEN and Mars Express Observations to Global Hybrid Simulation
Fedorov, A.; Holmström, M.; Modolo, R. +2 more
We study oxygen ion energization in the Mars-solar wind interaction by comparing particle and magnetic field observations on the Mars Atmosphere and Volatile EvolutioN (MAVEN) and Mars Express missions to a global hybrid simulation. We find that large-scale structures of the Martian-induced magnetosphere and plasma environment as well as the Mars …
Global MHD Simulations of the Earth's Bow Shock Shape and Motion Under Variable Solar Wind Conditions
Eastwood, J. P.; Schwartz, S. J.; Mejnertsen, L. +2 more
Empirical models of the Earth's bow shock are often used to place in situ measurements in context and to understand the global behavior of the foreshock/bow shock system. They are derived statistically from spacecraft bow shock crossings and typically treat the shock surface as a conic section parameterized according to a uniform solar wind ram pr…
Evidence for Auroral Emissions From Callisto's Footprint in HST UV Images
Gérard, Jean-Claude; Clarke, John T.; Grodent, Denis +3 more
Auroral emissions are expected from the footprint of Callisto in Jupiter's upper atmosphere owing to the known interaction of its atmosphere with Jupiter's magnetosphere, and from the observed auroral emissions from the footprints of the other three Galilean satellites. The mapping of Callisto along modeled magnetic field lines at Jupiter, however…
Ionospheric Irregularities at Mars Probed by MARSIS Topside Sounding
Gurnett, D. A.; Halekas, J. S.; Kopf, A. J. +2 more
The upper ionosphere of Mars contains a variety of perturbations driven by solar wind forcing from above and upward propagating atmospheric waves from below. Here we explore the global distribution and variability of ionospheric irregularities around the exobase at Mars by analyzing topside sounding data from the Mars Advanced Radar for Subsurface…
Comparison of Dust Impact and Solitary Wave Signatures Detected by Multiple Electric Field Antennas Onboard the MMS Spacecraft
Mann, Ingrid; Vaverka, Jakub; Pellinen-Wannberg, Asta +6 more
Dust impact detection by electric field instruments is a relatively new method. However, the influence of dust impacts on electric field measurements is not completely understood and explained. A better understanding is very important for reliable dust impact identification, especially in environments with low dust impact rate. Using data from Ear…