Search Results - "KILLEN, R. M"

Comparative Na and K Mercury and Moon Exospheres by Leblanc, F, Schmidt, C, Mangano, V, Mura, A, Cremonese, G, Raines, J M, Jasinski, J M, Sarantos, M, Milillo, A, Killen, R M, Massetti, S, Cassidy, T, R J Vervack, Jr, Kameda, S, Capria, M T, Horányi, M, Janches, D, Berezhnoy, A, Christou, A, Hirai, T, Lierle, P, Morgenthaler, J

“…Sodium and, in a lesser way, potassium atomic components of surface-bounded exospheres are among the brightest elements that can be observed from the Earth in…”
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The effect on the lunar exosphere of a coronal mass ejection passage by Killen, R. M., Hurley, D. M., Farrell, W. M.

“…Solar wind bombardment onto exposed surfaces in the solar system produces an energetic component to the exospheres about those bodies. The solar wind energy…”
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Anticipated electrical environment within permanently shadowed lunar craters by Farrell, W. M., Stubbs, T. J., Halekas, J. S., Killen, R. M., Delory, G. T., Collier, M. R., Vondrak, R. R.

“…Shadowed locations near the lunar poles are almost certainly electrically complex regions. At these locations near the terminator, the local solar wind flows…”
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Flux estimates of ions from the lunar exosphere by Sarantos, M., Hartle, R. E., Killen, R. M., Saito, Y., Slavin, J. A., Glocer, A.

“…We compare estimates for the ion fluxes of twelve expected constituents of the lunar exosphere with estimates for the ion fluxes ejected from the lunar surface…”
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The lunar photoelectron sheath: A change in trapping efficiency during a solar storm by Farrell, W. M., Poppe, A. R., Zimmerman, M. I., Halekas, J. S., Delory, G. T., Killen, R. M.

“…On the lunar dayside, photoelectrons are quasi‐constantly emitted from the Moon's surface and this electron flux acts to typically charge the dayside lunar…”
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Observations of the lunar impact plume from the LCROSS event by Killen, R. M., Potter, A. E., Hurley, D. M., Plymate, C., Naidu, S.

“…We observed emission from sodium (Na) ejected from the Lunar Crater Observing and Sensing Satellite (LCROSS) impact into Cabeus Crater on October 9, 2009,…”
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Solar radiation acceleration effects on Mercury sodium emission by Potter, A.E., Killen, R.M., Morgan, T.H.

“…A set of Mercury sodium emission data collected over a range of true anomaly angles during 1997–2003 was used to analyze the effect of solar radiation…”
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Midinfrared spectral features of rocks and their powders by Cooper, B. L., Salisbury, J. W., Killen, R. M., Potter, A. E.

“…We examined the thermal IR spectra of 35 rock samples and their fine‐powder equivalents to better understand the relationship between spectral features,…”
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Source rates and ion recycling rates for Na and K in Mercury's atmosphere by Killen, R.M., Sarantos, M., Potter, A.E., Reiff, P.

“…The supply rates of Na and K to the atmosphere of Mercury by processes acting on the extreme surface—thermal vaporization, photon-stimulated desorption (PSD),…”
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Evidence for space weather at Mercury by Killen, R. M., Potter, A. E., Reiff, P., Sarantos, M., Jackson, B. V., Hick, P., Giles, B.

“…Mercury's sodium atmosphere is known to be highly variable both temporally and spatially. During a week‐long period from November 13 to 20, 1997, the total…”
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Observations of the sodium tail of Mercury by Potter, A.E., Killen, R.M.

“…Cross-sections of the sodium emission tail of Mercury were measured at various distances down the tail when Mercury was moving away from the Sun (true anomaly…”
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Surface-exosphere-magnetosphere system of mercury by MILILLO, A, WURZ, P, CREMONESE, G, DAGLIS, I. A, DE ANGELIS, E, DI LELLIS, A. M, LIVI, S, MANGANO, V, TORKAR, K, ORSINI, S, DELCOURT, D, KALLIO, E, KILLEN, R. M, LAMMER, H, MASSETTI, S, MURA, A, BARABASH, S

“…Mercury is a poorly known planet, since the only space-based information comes from the three fly-bys performed in 1974 by the Mariner 10 spacecraft…”
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Spatial distribution of sodium on Mercury by Potter, A.E., Killen, R.M., Sarantos, M.

“…We observed the Mercury sodium exosphere during the period 1997–2003, collecting images of planetary sodium emission covering the full range of true anomaly…”
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Regarding the possible generation of a lunar nightside exo-ionosphere by Farrell, W.M., Halekas, J.S., Stubbs, T.J., Delory, G.T., Killen, R.M., Hartle, R.E., Collier, M.R.

“…The non-condensing neutral helium exosphere is at its most concentrated levels on the cold lunar nightside. We show herein that these He atoms are susceptible…”
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New discoveries from MESSENGER and insights into Mercury's exosphere by Vervack, R. J., Killen, R. M., McClintock, W. E., Merkel, A. W., Burger, M. H., Cassidy, T. A., Sarantos, M.

“…For most of the orbital phase of the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission, a regular search for weakly emitting or…”
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Discovery of calcium in Mercury's atmosphere by Bida, Thomas A, Killen, Rosemary M, Morgan, Thomas H

“…The composition and evolutionary history of Mercury's crust are not well determined. The planet as a whole has been predicted to have a refractory, anhydrous…”
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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…”
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The sodium tail of Mercury by POTTER, A. E., KILLEN, R. M., MORGAN, T. H.

“…— Mercury is difficult to observe because it is so close to the Sun. However, when the angle of the ecliptic is near maximum in the northern hemisphere, and…”
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Origins of Europa Na cloud and torus by Leblanc, F., Potter, A.E., Killen, R.M., Johnson, R.E.

“…Following the discovery observations by Brown and Hill [Brown, M.E., Hill, R.E., 1996. Discovery of an extended sodium atmosphere around Europa. Nature 380,…”
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Source and maintenance of the argon atmospheres of Mercury and the Moon by KILLEN, R. M.

“…— We propose that argon‐40 measured in the lunar atmosphere and that in Mercury's atmosphere is due to current diffusion into connected pore space within the…”
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