Zobrazeno 1 - 10
of 16
pro vyhledávání: '"James McFadden"'
Autor:
Daniel Gonzales, John Hollywood, Jerry M. Sollinger, James McFadden, John DeJarnette, Sarah Harting,
'The Stryker brigade, one of the Army's newest units, has a full complement of Army digital networked communications and battle command systems. An important issue for the Department of Defense and the Army is whether these networking capabilities tr
Autor:
Yaxue Dong, David Brain, Robin Ramstad, Xiaohua Fang, Yingjuan Ma, James McFadden, Jasper Halekas, Jared Espley, Shannon Curry
Ions originating from the upper atmosphere of Mars may be picked up by the impinging solar wind and interplanetary magnetic field (IMF), which forms an energetic ion plume from the dayside of the planet as a key feature of the Martian induced magneto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b66d06543733c8804850357b446cb63
https://doi.org/10.5194/egusphere-egu23-3699
https://doi.org/10.5194/egusphere-egu23-3699
Though ion escape to space is an important mechanism for atmospheric loss on Mars, the processes that accelerate ions to escape velocity have not been identifed and quantified. The lowest altitude where suprathermal planetary ions appear is an import
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5484a1f204c0059b6d799928477b0d1e
https://doi.org/10.5194/epsc2022-277
https://doi.org/10.5194/epsc2022-277
Autor:
Robin Ramstad, David Brain, James McFadden, David Mitchell, Laila Andersson, Jared Espley, Jasper Halekas, Mats Holmström, Shannon Curry
Fundamentally, what limits the rate of atmospheric ion escape from non-magnetized planets? Previous orbit-based in situ measurements of escaping heavy ions (O+, O2+ and heavier species) at Mars have yielded conflicting estimates of the dependencies o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f71ea0d5f45072c4d725db10754428b
https://doi.org/10.5194/epsc2022-704
https://doi.org/10.5194/epsc2022-704
Autor:
Christopher Fowler, Gwen Hanley, James McFadden, Jasper Halekas, Steven Schwartz, Christian Mazelle, Michael Chaffin, David Mitchell, Laila Andersson, Jared Espley, Robin Ramstad, Yaxue Dong, Shannon Curry
Mars is an unmagnetized planet meaning that it has no internally generated global dipole magnetic field; the solar wind interaction with Mars is thus highly dependent on upstream conditions that include the orientation of the Interplanetary Magnetic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ace4ba6fa5b29f0febc68df23b1b5c9
https://doi.org/10.5194/epsc2022-233
https://doi.org/10.5194/epsc2022-233
Mars has a patchwork of intense crustal magnetization that gives rise to magnetic fields that can dominate the plasma environment up to ~1000 km altitude in some locations. The strongest crustal fields, in the southern hemisphere centered near 180 de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::085103d49112f20df6056fbe7a5999de
https://doi.org/10.5194/epsc2022-654
https://doi.org/10.5194/epsc2022-654
Autor:
Shaosui Xu, David Mitchell, James McFadden, Christopher Fowler, Gwen Hanley, Tristan Weber, David Brain, Gina DiBraccio, Michael Liemohn, Robert Lillis, Jasper Halekas, Suranga Ruhunusiri, Christian Mazelle, Mehdi Benna, Laila Andersson, Shannon Curry
Discrete aurorae have been observed at Mars by multiple spacecraft, including Mars Express, Mars Atmosphere and Volatile EvolutioN (MAVEN), and most recently the United Arab Emirates’ Hope spacecraft. Meanwhile, there have been studies on the sourc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f14cb430334976053958f0631825efc8
https://doi.org/10.5194/epsc2022-302
https://doi.org/10.5194/epsc2022-302
Autor:
Hassanali Akbari, David Newman, Christopher Fowler, Robert Pfaff, Laila Andersson, David Malaspina, Steven Schwartz, Robert Ergun, James McFadden, David Mitchell, Jasper Halekas, Douglas Rowland
Publikováno v:
Journal of Geophysical Research: Space Physics. 127
Autor:
Robin Ramstad, David Brain, Yaxue Dong, Jasper Halekas, James McFadden, Jared Espley, Bruce Jakosky
Measurements of Energetic Neutral Atoms (ENAs) provide information about both the plasma and neutral components along the line-of-sight for any ENA instrument, though the individual influences of the plasma and neutral environments are convoluted due
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1144ff8a0ab61d5c9cd901981b49420
https://doi.org/10.5194/egusphere-egu22-10876
https://doi.org/10.5194/egusphere-egu22-10876
Publikováno v:
Icarus. 333:323-342
Previous work has established that the solar wind and micrometeoroids produce spectral changes on airless silicate bodies. However, the relative importance of these two weathering agents, the timescales over which they operate, and how their effects