Search Results - "Tucker, O. J"

Chemical interactions between Saturn's atmosphere and its rings by Waite, Jr, J H, Perryman, R S, Perry, M E, Miller, K E, Bell, J, Cravens, T E, Glein, C R, Grimes, J, Hedman, M, Cuzzi, J, Brockwell, T, Teolis, B, Moore, L, Mitchell, D G, Persoon, A, Kurth, W S, Wahlund, J-E, Morooka, M, Hadid, L Z, Chocron, S, Walker, J, Nagy, A, Yelle, R, Ledvina, S, Johnson, R, Tseng, W, Tucker, O J, Ip, W-H

“…The Pioneer and Voyager spacecraft made close-up measurements of Saturn's ionosphere and upper atmosphere in the 1970s and 1980s that suggested a chemical…”
Get full text

Thermally driven escape from Pluto’s atmosphere: A combined fluid/kinetic model by Tucker, O.J., Erwin, J.T., Deighan, J.I., Volkov, A.N., Johnson, R.E.

“…► We calculate thermal escape from Pluto’s atmosphere using a fluid/kinetic model. ► The results differ from those obtained using solely a fluid model. ► The…”
Get full text

The Enceladus and OH Tori at Saturn by Johnson, R. E, Smith, H. T, Tucker, O. J, Liu, M, Burger, M. H, Sittler, E. C, Tokar, R. L

“…The remarkable observation that Enceladus, a small icy satellite of Saturn, is actively venting has led to the suggestion that ejected water molecules are the…”
Get full text

Trace constituents of Europa's atmosphere by Cassidy, T.A., Johnson, R.E., Tucker, O.J.

“…Europa is bombarded by intense radiation that erodes the surface, launching molecules into a thin “atmosphere” representative of surface composition. In…”
Get full text

The Implantation and Interactions of O+ in Titan's Atmosphere: Laboratory Measurements of Collision-induced Dissociation of N2 and Modeling of Positive Ion Formation by Shah, M. B, Latimer, C. J, Montenegro, E. C, Tucker, O. J, Johnson, R. E, Smith, H. T

“…Energetic oxygen ions are an important component of the plasma incident onto Titan's atmosphere. Therefore, we report measurements of electron capture and…”
Get full text

Enceladus: The likely dominant nitrogen source in Saturn's magnetosphere by Smith, H.T., Johnson, R.E., Sittler, E.C., Shappirio, M., Reisenfeld, D., Tucker, O.J., Burger, M., Crary, F.J., McComas, D.J., Young, D.T.

“…The spatial distribution of N + in Saturn's magnetosphere obtained from Cassini Plasma Spectrometer (CAPS) data can be used to determine the spatial…”
Get full text

Hybrid fluid/kinetic modeling of Pluto’s escaping atmosphere by Erwin, Justin, Tucker, O.J., Johnson, Robert E.

“…•We simulate the escape of N2 from Pluto’s upper atmosphere.•We find fluid solutions consistent with two models of kinetic escape.•The resulting atmosphere is…”
Get full text

On the Effect of Magnetospheric Shielding on the Lunar Hydrogen Cycle by Tucker, O. J., Farrell, W. M., Poppe, A. R.

“…The global distribution of surficial hydroxyl on the Moon is hypothesized to be derived from the implantation of solar wind protons. As the Moon traverses the…”
Get full text

Gas transfer in the Pluto–Charon system: A Charon atmosphere by Tucker, O.J., Johnson, R.E., Young, L.A.

“…•Pluto’s extended atmosphere is transferred to Charon at a rate of 5.7×1025N2/s.•Charon’s atmosphere may be detectable during the NH occultation, 3×1018N2/m2…”
Get full text

Possible Anthropogenic Contributions to the LAMP-observed Surficial Icy Regolith within Lunar Polar Craters: A Comparison of Apollo and Starship Landings by Farrell, William M., Prem, P., Hurley, D. M., Tucker, O. J., Killen, R. M.

“…This work assesses the potential of midsized and large human landing systems to deliver water from their exhaust plumes to cold traps within lunar polar…”
Get full text

Evolution of an early Titan atmosphere by Johnson, R.E., Tucker, O.J., Volkov, A.N.

“…Rapid escape from a proposed early CH4/NH3 atmosphere on Titan could, in principle, limit the amount of NH3 that is converted by photolysis into the present N2…”
Get full text

Formation of lunar surface water associated with high-energy electrons in Earth’s magnetotail by Li, S., Poppe, A. R., Orlando, T. M., Jones, B. M., Tucker, O. J., Farrell, W. M., Hendrix, A. R.

“…Solar wind implantation is thought to be one of the primary mechanisms in the formation of water (OH/H 2 O) on the surface of the Moon and possibly on the…”
Get full text

Callisto's Atmosphere and Its Space Environment: Prospects for the Particle Environment Package on Board JUICE by Galli, A., Vorburger, A., Carberry Mogan, S. R., Roussos, E., Stenberg Wieser, G., Wurz, P., Föhn, M., Krupp, N., Fränz, M., Barabash, S., Futaana, Y., Brandt, P. C., Kollmann, P., Haggerty, D. K., Jones, G. H., Johnson, R. E., Tucker, O. J., Simon, S., Tippens, T., Liuzzo, L.

“…The JUpiter ICy moons Explorer (JUICE) of the European Space Agency will investigate Jupiter and its icy moons Europa, Ganymede, and Callisto, with the aim to…”
Get full text

Understanding the escape of water from Enceladus by Burger, M. H., Sittler Jr, E. C., Johnson, R. E., Smith, H. T., Tucker, O. J., Shematovich, V. I.

“…On 14 July 2005, Cassini passed within 175 km of Enceladus’ surface enabling a direct in situ measurement of water escaping from the surface by the Ion and…”
Get full text

Solar Wind Implantation Into the Lunar Regolith: Monte Carlo Simulations of H Retention in a Surface With Defects and the H2 Exosphere by Tucker, O. J., Farrell, W. M., Killen, R. M., Hurley, D. M.

“…The solar wind implants protons into the top 20–30 nm of lunar regolith grains, and the implanted hydrogen will diffuse out of the regolith but also interact…”
Get full text

Expansion of monatomic and diatomic gases from a spherical source into a vacuum in a gravitational field by Volkov, A. N., Johnson, R. E., Tucker, O. J.

“…Steady monatomic and diatomic gas flows from a spherical source into a vacuum in a gravitational field are studied using direct statistical simulation. The…”
Get full text

The influence of upper boundary conditions on molecular kinetic atmospheric escape simulations by Mogan, S. R. Carberry, Tucker, O. J, Johnson, R. E

“…Molecular kinetic simulations are typically used to accurately describe the tenuous regions of the upper atmospheres on planetary bodies. These simulations…”
Get full text

Lifetime of a transient atmosphere produced by lunar volcanism by Tucker, O.J., Killen, R.M., Johnson, R.E., Saxena, P.

“…Early in the Moon's history volcanic outgassing may have produced a periodic millibar level atmosphere (Needham and Kring 2017). We examined the relevant…”
Get full text

Solar Wind Implantation Into the Lunar Regolith: Monte Carlo Simulations of H Retention in a Surface With Defects and the H 2 Exosphere by Tucker, O. J., Farrell, W. M., Killen, R. M., Hurley, D. M.

“…The solar wind implants protons into the top 20–30 nm of lunar regolith grains, and the implanted hydrogen will diffuse out of the regolith but also interact…”
Get full text

Simulating the diffusion of hydrogen in amorphous silicates: A ‘jumping’ migration process and its implications for solar wind implanted lunar volatiles by Morrissey, Liam S., Pratt, D., Farrell, W.M., Tucker, O.J., Nakhla, S., Killen, R.M.

“…We use molecular dynamics (MD) simulations to better explain the movement of atomic hydrogen in amorphous silica and quantify the planetary science…”
Get full text