Search Publications
Collisional Heating of Interstellar Helium Flux at 1 AU
Gruntman, Mike
Because of relative motion of the local interstellar medium (LISM) with respect to the Sun, the interstellar wind, interstellar neutral helium atoms enter the heliosphere. Instruments on the Ulysses and Interstellar Boundary Explorer spacecraft measured directional dependencies of intensities, or sky maps, of helium atoms and determined the inters…
Ions Accelerated by Sounder-Plasma Interaction as Observed by Mars Express
Barabash, S.; Frahm, R. A.; Gurnett, D. +6 more
The ion sensor of the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-3) experiment detects accelerated ions during pulses of radio emissions from the powerful topside sounder: the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard Mars Express. Accelerated ions (O2+, O+, and lighter …
Traveling Ultralow-Frequency Waves and Their Influences Over Low-Energy, Charged Particles
Zong, Qiu-Gang; Yang, Mu; Zhou, Xu-Zhi +3 more
In Earth's magnetosphere, the behavior of charged particles in response to ultralow-frequency (ULF) waves has long been understood in the framework of their resonant interactions with standing hydromagnetic waves. It has been argued that for impulse-excited waves, it may take a few wave cycles for the standing structure to be fully established; du…
MARSIS Observations of Field-Aligned Irregularities and Ducted Radio Propagation in the Martian Ionosphere
Gurnett, D. A.; Buchert, S.; Edberg, N. J. T. +7 more
Knowledge of Mars's ionosphere has been significantly advanced in recent years by observations from Mars Express and lately Mars Atmosphere and Volatile EvolutioN. A topic of particular interest are the interactions between the planet's ionospheric plasma and its highly structured crustal magnetic fields and how these lead to the redistribution of…
Magnetotail Configuration During a Steady Convection Event as Observed by Low-Altitude and Magnetospheric Spacecraft
Sergeev, V. A.; Tsyganenko, N. A.; Angelopoulos, V. +2 more
Motivated by ongoing discussion regarding the magnetic configuration in the near-Earth and midtail regions and its role in populating the inner magnetosphere during long-duration steady magnetospheric convection (SMC) events, we analyze a rich collection of observations during 10 hr of strong, steady solar wind driving. Auroral boundaries and regi…
Empirical Modeling of Dayside Magnetic Structures Associated With Polar Cusps
Tsyganenko, N. A.; Andreeva, V. A.
The magnetic structure of dayside polar cusps is intimately related to the high-latitude field-aligned currents (FACs) and the cross-B diamagnetic currents due to the penetrated plasma of magnetosheath origin. The dayside FAC configuration is sensitive to the azimuthal component of the interplanetary magnetic field, manifested in the latitudinal s…
Diagnostics of Closed Magnetic Flux Depletion in the Near-Earth Magnetotail During the Substorm Growth Phase
Gordeev, E. I.; Sergeev, V. A.; Shinohara, I. +1 more
Based on magnetohydrodynamics simulations, it was recently suggested that magnetotail reconfiguration during the substorm growth phase results from combined action of two large-scale processes: (1) open magnetic flux accumulation (OMFA) in the tail lobes and (2) closed magnetic flux depletion (CMFD) in the near-Earth tail, caused by flux evacuatio…
Global Maps of Energetic Ions in Saturn's Magnetosphere
Mitchell, D. G.; Carbary, J. F.; Hamilton, D. C.
The Magnetospheric Imaging Instrument/Charge Energy Mass Spectrometer onboard the Cassini spacecraft measured suprathermal H+ and water group (W+) ions during the 13-year mission from 2004 to 2017. This paper generates statistical maps of pulse height analyzed fluxes for 3.24-3.34 keV H+ and 8.79-9.05 keV W+
The Largest Electron Differential Energy Flux Observed at Mars by the Mars Express Spacecraft, 2004-2016
Coates, A. J.; Barabash, S.; Holmström, M. +3 more
The goal of this paper is to understand the processes by which solar wind electrons are energized in the Martian magnetosphere and how this compares to processes at Venus and Earth. Each is unique in the source of its magnetic field topology and how this influences electron energization. To achieve this goal, 24 million spectra spanning 13 years h…