Search Publications
Evidence of Ice-Rich Layered Deposits in the Medusae Fossae Formation of Mars
Orosei, Roberto; Plaut, Jeffrey J.; Campbell, Bruce A. +4 more
Subsurface reflectors in radar sounder data from the Mars Advanced Radar for Subsurface and Ionospheric Sounding instrument aboard the Mars Express spacecraft indicate significant dielectric contrasts between layers in the Martian Medusae Fossae Formation (MFF). Large density changes that create dielectric contrasts are less likely in deposits of …
Do Solar Energetic Particle (SEP) Events Influence the Formation of the V0 Layer in the Venusian Ionosphere?
Choudhary, R. K.; Imamura, T.; Sánchez-Cano, Beatriz +2 more
This study investigates the potential impact of Solar Energetic Particles (SEPs) on the V0 layer of the Venus ionosphere. Electron density profiles obtained from radio occultation experiments conducted by the Venus Express (VEX) and Akatsuki missions were utilized for this purpose. Background data from the Analyzer of Space Plasma and E…
Ion-Acoustic Waves Associated With Interplanetary Shocks
Fedorov, A.; André, M.; Maksimovic, M. +10 more
Ion-acoustic waves (IAWs) commonly occur near interplanetary (IP) shocks. These waves are important because of their potential role in the dissipation required for collisionless shocks to exist. We study IAW occurrence statistically at different heliocentric distances using Solar Orbiter to identify the processes responsible for IAW generation nea…
Frequency Chirping of Electromagnetic Ion Cyclotron Waves in Earth's Magnetosphere
An, Zeyu; Tao, Xin; Zonca, Fulvio +1 more
Electromagnetic ion cyclotron (EMIC) waves are known to exhibit frequency chirping occasionally, contributing to the rapid acceleration and precipitation of energetic particles in the magnetosphere. However, the chirping mechanism of EMIC waves remains elusive. In this work, a phenomenological model of whistler mode chorus waves named the Trap-Rel…
Revising the Basal Permittivity of the South Polar Layered Deposits of Mars With a Surficial Dust Cover
Kofman, W.; Hérique, A.; Grima, C. +1 more
Bright basal reflections from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) have been proposed to be consistent with permittivities characteristic of a wet material beneath the south polar layered deposits (SPLD). The characterization of a recently formed impact crater highlight the existence of a several meters thick ice…
Latitudinal Mapping of Chorus Waves Growth Rates Based on Multi-Spacecraft Wave and Plasma Measurements
Agapitov, O. V.; Artemyev, A.; Mourenas, D. +3 more
Whistler mode chorus waves are one of the most intense and important electromagnetic emissions in the Earth's radiation belt, where these waves are responsible for electron acceleration to relativistic energies and for energetic electron precipitation into the Earth's atmosphere. This study reports a unique multi-spacecraft observation event that …
Strong Localized Pumping of Water Vapor to High Altitudes on Mars During the Perihelion Season
Aoki, S.; Vandaele, A. C.; Daerden, F. +18 more
Here we present water vapor vertical profiles observed with the ExoMars Trace Gas Orbiter/Nadir and Occultation for MArs Discovery instrument during the perihelion and Southern summer solstice season (LS = 240°-300°) in three consecutive Martian Years 34, 35, and 36. We show the detailed latitudinal distribution of H2O at tan…
In Situ Observational Evidence of the Polar Cap Arc at 1500 MLT (15MLT-PCA) Associated With the Lobe Reconnection
Shi, Run; Han, Desheng; Feng, Huiting +4 more
The polar cap arc at 1500 MLT (15MLT-PCA) has been considered as an auroral signature of the cusp's duskside boundary and been speculated to be caused by lobe reconnection. However, no observational evidence has been provided to support this speculation. Here we report a 15MLT-PCA event occurred on 29 November 2017 using multi-instrument observati…
On the Response of Protons to Dynamical Reconfigurations of Mercury's Magnetosphere
Hadid, L. Z.; Aizawa, S.; Delcourt, D.
We examine the dynamics of protons during tail-like to dipole-like reconfigurations of Mercury's magnetosphere. Such reconfigurations that frequently occur in the highly dynamical Hermean environment are accompanied by induced electric fields leading to short-lived convection enhancements. Using test particle calculations, we show that, under the …
Repeated and Long-Lasting Fault Activation on Amazonian Mars as Demonstrated by Tectonically Induced Landslides
Fawdon, P.; Balme, M. R.; Rothery, D. A. +1 more
We identify and analyze a large shortening structure (surface expression of a thrust fault) in western Arabia Terra, Mars, exhibiting recent, repeated, and long-lasting tectonic activity. Where the fault system deforms Marsabit crater rim, four landslides with differing degradation states extend onto the crater floor. We propose these were trigger…