Rhoden
Alyssa R.
Rhoden
Alyssa R.
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ArticleScience goals and mission architecture of the Europa Lander mission concept(IOP Publishing, 2022-01-26) Hand, Kevin P. ; Phillips, Cynthia B. ; Murray, Alison E. ; Garvin, James B. ; Maize, Earl H. ; Gibbs, Roger G. ; Reeves, Glenn ; San Martin, A. Miguel ; Tan-Wang, Grace H. ; Krajewski, Joel ; Hurst, Kenneth ; Crum, Ray ; Kennedy, Brett A. ; McElrath, Timothy P. ; Gallon, John C. ; Sabahi, Dara ; Thurman, Sam W. ; Goldstein, Barry ; Estabrook, Polly ; Lee, Steven W. ; Dooley, Jennifer A. ; Brinckerhoff, William B. ; Edgett, Kenneth S. ; German, Christopher R. ; Hoehler, Tori M. ; Hörst, Sarah M. ; Lunine, Jonathan I. ; Paranicas, Christopher ; Nealson, Kenneth H. ; Smith, David E. ; Templeton, Alexis S. ; Russell, Michael J. ; Schmidt, Britney E. ; Christner, Brent C. ; Ehlmann, Bethany L. ; Hayes, Alexander ; Rhoden, Alyssa R. ; Willis, Peter ; Yingst, R. Aileen ; Craft, Kathleen L. ; Cameron, Marissa E. ; Nordheim, Tom A. ; Pitesky, Jo ; Scully, Jennifer ; Hofgartner, Jason D. ; Sell, Steve W. ; Barltrop, Kevin J. ; Izraelevitz, Jacob ; Brandon, Erik J. ; Seong, J. ; Jones, John-Paul ; Pasalic, Jasmina ; Billings, Keith J. ; Ruiz, John Paul ; Bugga, Ratnakumar V. ; Graham, Dan ; Arenas, L. A. ; Takeyama, Deidre ; Drummond, Mai ; Aghazarian, Hrand ; Andersen, Allen J. ; Andersen, Kayla B. ; Anderson, E. W. ; Babuscia, Alessandra ; Backes, Paul G. ; Bailey, Elizabeth S. ; Balentine, Daniel ; Ballard, Christopher G. ; Berisford, Daniel F. ; Bhandari, Pradeep ; Blackwood, Krys ; Bolotin, Gary S. ; Bovre, Emilee A. ; Bowkett, Joseph ; Boykins, Kobie T. ; Bramble, Michael S. ; Brice, Timothy M. ; Briggs, Paul ; Brinkman, Alexander P. ; Brooks, Shawn M. ; Buffington, Brent B. ; Burns, Brandon ; Cable, Morgan L. ; Campagnola,Stefano ; Cangahuala, Laureano A. ; Carr, Gregory A. ; Casani, John R. ; Chahat, Nacer E. ; Chamberlain-Simon, Brendan K. ; Cheng, Yun-Ting ; Chien, Steve A. ; Cook, B. T. ; Cooper, Moogega ; Dinicola, Michael ; Clement, Brian G. ; Dean, Zachary S. ; Cullimore, Emily A. ; Curtis, Aaron G. ; de la Croix, Jean-Pierre ; Di Pasquale, Peter ; Dodd, Emma M. ; Dubord, Luke A. ; Edlund, Jeffrey A. ; Ellyin, Raymond ; Emanuel, Blair ; Foster, Jeffrey T. ; Ganino, Anthony J. ; Garner, Gregory J. ; Gibson, Matt T. ; Gildner, Matt ; Glazebrook, Kenneth J. ; Greco, Martin E. ; Green, W. M. ; Hatch, Sara J. ; Hetzel, Mark M. ; Hoey, William A. ; Hofmann, Amy E. ; Ionasescu, Rodica ; Jain, Abhinandan ; Jasper, Jay D. ; Johannesen, Jennie R. ; Johnson, Glenn K. ; Jun, Insoo ; Katake, Anup B. ; Kim-Castet, So Young ; Kim, David Inkyu ; Kim, Wousik ; Klonicki, Emily F. ; Kobeissi, Brad ; Kobie, Bryan D. ; Kochocki, Joseph ; Kokorowski, Michael ; Kosberg, Jacob A. ; Kriechbaum, Kristopher ; Kulkarni, Tejas P. ; Lam, Rebekah L. ; Landau, Damon F. ; Lattimore, Myra A. ; Laubach, Sharon L. ; Lawler, Christopher R. ; Lim, Grace ; Li, Jui-Lin ; Litwin, Todd E. ; Lo, Martin W. ; Logan, Cambria A. ; Maghasoudi, Elham ; Mandrake, Lukas ; Marchetti, Yuliya ; Marteau, Eloise ; Maxwell, Kimberly A. ; McNamee, John B. ; McIntyre, Ocean ; Meacham, Michael ; Melko, Joseph P. ; Mueller, Juergen ; Muliere, David ; Mysore, Aprameya ; Nash, Jeremy ; Ono, Masahiro ; Parker, Jay M. ; Perkins, Rebecca C. ; Petropoulos, Anastassios E. ; Gaut, Aaron ; Piette Gomez, Marie Y. ; Casillas, Raul Polit ; Preudhomme, Michael ; Pyrzak, Guy ; Rapinchuk, Jacqueline ; Ratliff, John Martin ; Ray, T. L. ; Roberts, Eric T. ; Roffo, Kenneth ; Roth, Duane C. ; Russino, Joseph A. ; Schmidt, Tyler M. ; Schoppers, Marcel J. ; Senent, Juan S. ; Serricchio, Fred ; Sheldon, Douglas J. ; Shiraishi, Lori R. ; Shirvanian, James ; Siegel, Katherine J. ; Singh, Gurjeet ; Sirota, Allen R. ; Skulsky, Eli D. ; Stehly, Joseph S. ; Strange, Nathan J. ; Stevens, Sarah U. ; Sunada, Eric T. ; Tepsuporn, Scott P. ; Tosi, Luis Phillipe C. ; Trawny, Nikolas ; Uchenik, Igor ; Verma, Vandi ; Volpe, Richard A. ; Wagner, Caleb T. ; Wang, D. ; Willson, Reg G. ; Wolff, John Luke ; Wong, A. T. ; Zimmer, Aline K. ; Sukhatme, Kalyani G. ; Bago, Kevin A. ; Chen, Yang ; Deardorff, Alyssa M. ; Kuch, Roger S. ; Lim, Christopher ; Syvertson, Marguerite L. ; Arakaki, Genji A. ; Avila, Art ; DeBruin, Kevin J. ; Frick, Andreas ; Harris, Joby R. ; Heverly, Matthew C. ; Kawata, Jessie M. ; Kim, Sung-Kyun ; Kipp, Devin M. ; Murphy, Juliana ; Smith, Matthew W. ; Spaulding, Matthew D. ; Thakker, Rohan ; Warner, Noah Z. ; Yahnker, Chris R. ; Young, M. E. ; Magner, Tom ; Adams, Danica ; Bedini, Peter ; Mehr, Lauren ; Sheldon, Colin ; Vernon, Steven ; Bailey, Vince ; Briere, Marc ; Butler, Michael ; Davis, Amanda ; Ensor, Susan ; Gannon, Michele ; Haapala-Chalk, Amanda ; Hartka, Ted ; Holdridge, Mark ; Hong, Albert ; Hunt, J. ; Iskow, Joe ; Kahler, Faith ; Murray, Kimberly ; Napolillo, David ; Norkus, Michael ; Pfisterer, Rick ; Porter, Jamie ; Roth, David ; Schwartz, Paul ; Wolfarth, Lawrence ; Cardiff, Eric ; Davis, Anita ; Grob, Eric W. ; Adam, Jason R. ; Betts, Erin ; Norwood, Jason ; Heller, M. M. ; Voskuilen, Tyler ; Sakievich, Philip ; Gray, L. ; Hansen, D. J. ; Irick, Kevin W. ; Hewson, John C. ; Lamb, Joshua ; Stacy, S. C. ; Brotherton, Chris M. ; Tappan, Alexander S. ; Benally, Darryl ; Thigpen, Hannah ; Ortiz, Erick ; Sandoval, Dan ; Ison, Aaron M. ; Warren, M. ; Stromberg, Peter G. ; Thelen, Paul Mark ; Blasy, B. ; Nandy, Prabal ; Haddad, Alexandria W. ; Trujillo, Lynna B. ; Wiseley, T. H. ; Bell, S. A. ; Teske, Nicholas P. ; Post, C. ; Torres-Castro, Loraine ; Grosso, Chris ; Wasiolek, MarylaEuropa is a premier target for advancing both planetary science and astrobiology, as well as for opening a new window into the burgeoning field of comparative oceanography. The potentially habitable subsurface ocean of Europa may harbor life, and the globally young and comparatively thin ice shell of Europa may contain biosignatures that are readily accessible to a surface lander. Europa's icy shell also offers the opportunity to study tectonics and geologic cycles across a range of mechanisms and compositions. Here we detail the goals and mission architecture of the Europa Lander mission concept, as developed from 2015 through 2020. The science was developed by the 2016 Europa Lander Science Definition Team (SDT), and the mission architecture was developed by the preproject engineering team, in close collaboration with the SDT. In 2017 and 2018, the mission concept passed its mission concept review and delta-mission concept review, respectively. Since that time, the preproject has been advancing the technologies, and developing the hardware and software, needed to retire risks associated with technology, science, cost, and schedule.
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ArticlePlanetary oceanography: leveraging expertise among earth and planetary science(Oceanography Society, 2022-08-09) German, Christopher R. ; Arrigo, Kevin R. ; Murray, Alison E. ; Rhoden, Alyssa R.The study of planetary oceanography is a new and exciting field of research. While humanity’s formal scientific studies of Earth’s ocean began nearly 150 years ago with the launch of the Challenger Expedition (Thomson et al., 1873), the study of oceans beyond Earth commenced only in this millennium. The first confirmation of an extensive saltwater ocean anywhere beyond Earth came relatively late within the lifetime of NASA’s Galileo mission (1989–2003; Kivelson et al., 2000), but continuing exploration has now revealed compelling evidence for large-volume watery oceans on five ice-covered moons of our outer solar system (Figure 1), with as many as 10–20 candidate moons and dwarf planets also under consideration (Hendrix et al., 2019). Of the five confirmed ocean worlds (Jupiter’s moons Europa, Callisto, and Ganymede; Saturn’s moons Enceladus and Titan), three have oceans so deep that a high-pressure form of ice develops deep within the ocean, beneath the liquid water but overlying any rocky interior (Nimmo and Papallardo, 2016). As a consequence, the watery ocean is trapped within an “ice sandwich.” By contrast, the other two confirmed ocean worlds (Europa and Enceladus) have oceans that are in direct contact with a rocky interior.
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ArticleSurviving in ocean worlds: experimental characterization of fiber optic tethers across Europa-like ice faults and unraveling the sliding behavior of ice(IOP Publishing, 2023-01-09) Singh, Vishaal ; McCarthy, Christine ; Silvia, Matthew ; Jakuba, Michael V. ; Craft, Kathleen L. ; Rhoden, Alyssa R. ; German, Chris ; Koczynski, Theodore A.As an initial step toward in situ exploration of the interiors of Ocean Worlds to search for life using cryobot architectures, we test how various communication tethers behave under potential Europa-like stress conditions. By freezing two types of pretensioned insulated fiber optic cables inside ice blocks, we simulate tethers being refrozen in a probe’s wake as it traverses through an Ocean World’s ice shell. Using a cryogenic biaxial apparatus, we simulate shear motion on preexisting faults at various velocities and temperatures. These shear tests are used to evaluate the mechanical behavior of ice, characterize the behavior of communication tethers, and explore their limitations for deployment by a melt probe. We determine (a) the maximum shear stress tethers can sustain from an ice fault, prior to failure (viable/unviable regimes for deployment), and (b) optical tether performance for communications. We find that these tethers are fairly robust across a range of temperature and velocity conditions expected on Europa ( T = 95–260 K, velocity = 5 × 10 −7 m s −1 to 3 × 10 −4 m s −1 ). However, damage to the outer jackets of the tethers and stretching of inner fibers at the coldest temperatures tested both indicate a need for further tether prototype development. Overall, these studies constrain the behavior of optical tethers for use at Ocean Worlds, improve the ability to probe thermomechanical properties of dynamic ice shells likely to be encountered by landed missions, and guide future technology development for accessing the interiors of (potentially habitable ± inhabited) Ocean Worlds.