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Density Structures, Dynamics, and Seasonal and Solar Cycle Modulations of Saturn's Inner Plasma Disk
André, N.; Persoon, A. M.; Garnier, P. +7 more
We present statistical results from the Cassini Radio and Plasma Wave Science (RPWS) Langmuir probe measurements recorded during the time interval from orbit 3 (1 February 2005) to 237 (29 June 2016). A new and improved data analysis method to obtain ion density from the Cassini LP measurements is used to study the asymmetries and modulations foun…
Proper motions of the HH 1 jet
Velázquez, P. F.; Bally, J.; Raga, A. C. +9 more
We describe a new method for determining proper motions of extended objects, and a pipeline developed for the application of this method. We then apply this method to an analysis of four epochs of [S II] HST images of the HH 1 jet (covering a period of ≈20 yr). We determine the proper motions of the knots along the jet, and make a reconstruction o…
Observations of Phobos by the Mars Express radar MARSIS: Description of the detection techniques and preliminary results
Plettemeier, D.; Orosei, R.; Plaut, J. J. +4 more
The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) (Picardi et al., 2005) is a synthetic aperture low frequency radar altimeter, onboard the ESA Mars Express orbiter, launched in June 2003. It is the first and so far the only spaceborne radar that has observed the Martian moon Phobos. Radar echoes were collected on different f…
Modelled isotopic fractionation and transient diffusive release of methane from potential subsurface sources on Mars
Stevens, Adam H.; Lewis, Stephen R.; Patel, Manish R.
We calculate transport timescales of martian methane and investigate the effect of potential release mechanisms into the atmosphere using a numerical model that includes both Fickian and Knudsen diffusion. The incorporation of Knudsen diffusion, which improves on a Fickian description of transport given the low permeability of the martian regolith…
The photochemical fractionation of oxygen isotopologues in Titan's atmosphere
Dobrijevic, M.; Loison, J. C.; Hickson, K. M. +1 more
The origin of CO and the external source of H2O in the atmosphere of Titan is still a matter of debate. We investigated the chemical fractionation of oxygen isotopologues in order to give new constraints on the origin of oxygen species. We created a new chemical scheme and we developed a 1-D time-dependent photochemical model to compute…
Joint two-point observations of LF-waves at 67P/Churyumov—Gerasimenko
Glassmeier, K. -H.; Richter, I.; Fornacon, K. -H. +5 more
After the Rosetta mission reached its target comet 67P/Churyumov-Gerasimenko, the lander Philae touched down on the surface on 2014 November 12. During the First-Science-Sequence after touchdown the lander magnetometer ROMAP and the orbiter magnetometer RPC-MAG were both operating simultaneously which allowed for in situ magnetic two-point observa…
The effect of like-charge attraction on aerosol growth in the atmosphere of Titan
Lindgren, Eric B.; Stamm, Benjamin; Chan, Ho-Kei +3 more
The formation of aerosols in the atmosphere of Titan is based extensively on ion-neutral chemistry and physical condensation processes. Herein it is shown that the formation of aerosols may also occur through an alternative pathway that involves the physical aggregation of negatively charged particles, which are known to be abundant in the satelli…
Chromospheric impact of an exploding solar granule
Bello González, N.; Rezaei, R.; Fischer, C. E.
Context. Observations of multi-wavelength and therefore height-dependent information following events throughout the solar atmosphere and unambiguously assigning a relation between these rapidly evolving layers are rare and difficult to obtain. Yet, they are crucial for our understanding of the physical processes that couple the different regimes …
Simultaneous Constraints on the Mass and Radius of Aql X-1 from Quiescence and X-Ray Burst Observations
Chen, Li; Falanga, Maurizio; Li, Zhaosheng +2 more
The measurement of neutron star mass and radius is one of the most direct ways to distinguish between various dense matter equations of state. The mass and radius of accreting neutron stars hosted in low-mass X-ray binaries can be constrained by several methods, including photospheric radius expansion from type I X-ray bursts and from quiescent sp…
UV production of methane from surface and sedimenting IDPs on Mars in light of REMS data and with insights for TGO
Moores, John E.; Smith, Christina L.; Schuerger, Andrew C.
This paper refines model predictions for the production of methane from UV-irradiated interplanetary dust particles (IDPs) now that the Rover Environmental Monitoring Station (REMS) instrument onboard the Mars Science Laboratory (MSL) Rover has made the first measurements of the UV environment on the surface of Mars, at Gale Crater. Once these mea…