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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…
The structure and variability of Mars dayside thermosphere from MAVEN NGIMS and IUVS measurements: Seasonal and solar activity trends in scale heights and temperatures
Stiepen, Arnaud; Schneider, Nicholas M.; Bougher, Stephen W. +10 more
Mars dayside thermospheric temperature and scale height trends were examined using measurements from the Neutral Gas Ion Mass Spectrometer (NGIMS) and the Imaging Ultraviolet Spectrograph (IUVS) on the Mars Atmosphere Volatile EvolutioN (MAVEN) spacecraft. Average scale heights (over 150-180 km for solar zenith angles ≤75°) from several different …
Interplanetary coronal mass ejection observed at STEREO-A, Mars, comet 67P/Churyumov-Gerasimenko, Saturn, and New Horizons en route to Pluto: Comparison of its Forbush decreases at 1.4, 3.1, and 9.9 AU
Barabash, S.; Krupp, N.; Roussos, E. +48 more
We discuss observations of the journey throughout the Solar System of a large interplanetary coronal mass ejection (ICME) that was ejected at the Sun on 14 October 2014. The ICME hit Mars on 17 October, as observed by the Mars Express, Mars Atmosphere and Volatile EvolutioN Mission (MAVEN), Mars Odyssey, and Mars Science Laboratory (MSL) missions,…
MMS Observation of Magnetic Reconnection in the Turbulent Magnetosheath
Lavraud, B.; Vaivads, A.; Le Contel, O. +30 more
In this paper we use the full armament of the MMS (Magnetospheric Multiscale) spacecraft to study magnetic reconnection in the turbulent magnetosheath downstream of a quasi-parallel bow shock. Contrarily to the magnetopause and magnetotail cases, only a few observations of reconnection in the magnetosheath have been reported. The case study in thi…
Rapid precipitation of radiation belt electrons induced by EMIC rising tone emissions localized in longitude inside and outside the plasmapause
Omura, Yoshiharu; Kubota, Yuko
By performing test particle simulations of relativistic electrons scattered by electromagnetic ion cyclotron (EMIC) rising tone emissions, we find a nonlinear scattering process named SLPA (Scattering at Low Pitch Angle) totally different from the nonlinear wave trapping. The nonlinear wave trapping, occurring for high pitch angles away from the l…