Search Publications
Venus's winds and temperatures during the MESSENGER's flyby: An approximation to a three-dimensional instantaneous state of the atmosphere
Clancy, R. T.; Hueso, R.; Sánchez-Lavega, A. +14 more
Even though many missions have explored the Venus atmospheric circulation, its instantaneous state is poorly characterized. In situ measurements vertically sampling the atmosphere exist for limited locations and dates, while remote sensing observations provide only global averages of winds at altitudes of the clouds: 47, 60, and 70 km. We present …
Radar sounder evidence of thick, porous sediments in Meridiani Planum and implications for ice-filled deposits on Mars
Grant, John A.; Plaut, Jeffrey J.; Phillips, Roger J. +5 more
Meridiani Planum is one of the most intensely studied regions on Mars, yet little is known about the physical properties of the deposits below those examined by the Opportunity rover. We report the detection of subsurface echoes within the Meridiani Planum deposits from data obtained by the Mars Advanced Radar for Subsurface and Ionospheric Soundi…
Growth rate measurement of ULF waves in the ion foreshock
Hietala, H.; Angelopoulos, V.; Dorfman, S. +1 more
We report the first satellite measurement of the ultralow frequency (ULF) wave growth rate in the upstream region of the Earth's bow shock. We employ the two identical ARTEMIS spacecraft orbiting the Moon to characterize crescent-shaped reflected ion beams and relatively monochromatic ULF waves. The event presented here features spacecraft separat…
The interplanetary magnetic field observed by Juno enroute to Jupiter
Connerney, John E. P.; Gruesbeck, Jacob R.; Gershman, Daniel J. +1 more
The Juno spacecraft was launched on 5 August 2011 and spent nearly 5 years traveling through the inner heliosphere on its way to Jupiter. The Magnetic Field Investigation was powered on shortly after launch and obtained vector measurements of the interplanetary magnetic field (IMF) at sample rates from 1 to 64 samples/second. The evolution of the …
Tangential deflection and formation of counterstreaming flows at the impact of a plasma jet on a tangential discontinuity
Echim, M.; Voitcu, G.
In this letter we report three-dimensional particle-in-cell simulations of the interaction between a nonpenetrable magnetosheath jet and the magnetopause, for northward interplanetary magnetic field. The magnetopause is modeled as a tangential discontinuity with no magnetic shear. We investigate the deflection of the plasma jet in the direction ta…
The vertical transport of methane from different potential emission types on Mars
Patel, M. R.; Lewis, S. R.; Holmes, J. A.
The contrasting evolutionary behavior of the vertical profile of methane from three potential release scenarios is analyzed using a global circulation model with assimilated temperature profiles. Understanding the evolving methane distribution is essential for interpretation of future retrievals of the methane vertical profile taken by instruments…
Schumann resonances at Mars: Effects of the day-night asymmetry and the dust-loaded ionosphere
Montmessin, F.; Toledo-Redondo, S.; Molina-Cuberos, G. J. +6 more
Schumann resonances are standing waves that oscillate in the electromagnetic cavity formed between the conducting lower ionosphere and the surface of the planet. They have been measured in situ only on Earth and Titan, although they are believed to exist on other planets like Mars. We report numerical simulations of the Martian electromagnetic cav…
Observations of multiharmonic ion cyclotron waves due to inverse ion cyclotron damping in the northern magnetospheric cusp
Gunell, H.; Slapak, R.; Hamrin, M.
We present a case study of inverse ion cyclotron damping taking place in the northern terrestrial magnetospheric cusp, exciting waves at the ion cyclotron frequency and its harmonics. The ion cyclotron waves are primarily seen as peaks in the magnetic-field spectral densities. The corresponding peaks in the electric-field spectral densities are no…
Dual E × B flow responses in the dayside ionosphere to a sudden IMF By rotation
Trattner, K. J.; Eriksson, S.; Baker, J. B. H. +3 more
We report for the first time a dual transition state in the dayside ionosphere following a sudden rotation of the interplanetary magnetic field (IMF) in the upstream magnetosheath from IMF <fi>B</fi><fi>y</fi> < 0 to <fi>B</fi><fi>y</fi> > 0 during <fi>B</fi>
New suprathermal proton population around the Moon: Observation by SARA on Chandrayaan-1
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +4 more
We report a new population of suprathermal H+ (∼1.5-3 times the solar wind energy) around the Moon observed by Solar Wind Monitor (SWIM)/Sub-keV Atom Reflecting Analyzer (SARA) on Chandrayaan-1. These ions have large initial velocity (>100 km s-1) and are observed on the dayside, near the terminator, and in the near-wake r…