A study on Ganymede's surface topography: Perspectives for radar sounding

Berquin, Yann; Kofman, W.; Hérique, Alain; Alberti, Giovanni; Beck, Pierre

doi:10.1016/j.pss.2012.07.004

Cited by 16 publications

(11 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two instruments have been selected for upcoming missions to Ganymede and Europa: the 9 MHz frequency Radar for Icy Moons Exploration (RIME) instrument on board the European Space Agency's Jupiter Icy Moons Explorer (JUICE) and the 9 and 60 MHz frequency Radar for Europa Assessment and Sounding: Ocean to Near-surface (REASON) instrument on board NASA's Europa Clipper (Bruzzone and others, 2013; Pappalardo and others, 2015; Lorente and others, 2017; Blankenship and others, 2018). These sounders are designed to probe the moons' interiors and have penetration depths which are functions of surface roughness, volume scattering, ice-shell thermal structure, chemistry and the character of the ice/water interface (Moore, 2000; McKinnon, 2005; Blankenship and others, 2009; Bruzzone and others, 2011; Schmidt and others, 2011; Berquin and others, 2013; Grima and others, 2014b; Pettinelli and others, 2015; Di Paolo and others, 2016; Grima and others, 2016; Aglyamov and others, 2017; Heggy and others, 2017; Kalousová and others, 2017; Campbell and others, 2018; Gerekos and others, 2018; Michaelides and Schroeder, 2019; Culha and others, 2020). The addition of a dual-channel VHF band on REASON also allows for characterization of the European ionosphere, altimetric investigation of Europa's shell and tides, and dual-frequency or interferometric clutter discrimination (Grima and others, 2015; Carrer and Bruzzone, 2017; Castelletti and others, 2017; Haynes and others, 2018a; Steinbrügge and others, 2018; Scanlan and others, 2019).…”

Section: Planetary Radioglaciologymentioning

confidence: 99%

Five decades of radioglaciology

et al. 2020

View full text Add to dashboard Cite

Radar sounding is a powerful geophysical approach for characterizing the subsurface conditions of terrestrial and planetary ice masses at local to global scales. As a result, a wide array of orbital, airborne, ground-based, and in situ instruments, platforms and data analysis approaches for radioglaciology have been developed, applied or proposed. Terrestrially, airborne radar sounding has been used in glaciology to observe ice thickness, basal topography and englacial layers for five decades. More recently, radar sounding data have also been exploited to estimate the extent and configuration of subglacial water, the geometry of subglacial bedforms and the subglacial and englacial thermal states of ice sheets. Planetary radar sounders have observed, or are planned to observe, the subsurfaces and near-surfaces of Mars, Earth's Moon, comets and the icy moons of Jupiter. In this review paper, and the thematic issue of the Annals of Glaciology on ‘Five decades of radioglaciology’ to which it belongs, we present recent advances in the fields of radar systems, missions, signal processing, data analysis, modeling and scientific interpretation. Our review presents progress in these fields since the last radio-glaciological Annals of Glaciology issue of 2014, the context of their history and future prospects.

show abstract

Section: Planetary Radioglaciologymentioning

confidence: 99%

Five decades of radioglaciology

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The surface roughness on Europa and Ganymede is weakly constrained by sparse observations from the Galileo and Voyager spacecraft using stereo-imagery and photoclinometry analyses. However, is the data are sufficient to show that these bodies support some of the roughest local terrains observed in the solar system (Berquin et al, 2012;Schenk, 2009). The most promising terrains for science on Europa lie where surface materials are potentially exchanged with the subsurface ocean.…”

Section: Radar Design and Icy Moons Landingmentioning

confidence: 94%

Planetary landing-zone reconnaissance using ice-penetrating radar data: Concept validation in Antarctica

Grima

Schroeder

Blankenship

et al. 2014

Planetary and Space Science

View full text Add to dashboard Cite

a b s t r a c tThe potential for a nadir-looking radar sounder to retrieve significant surface roughness/permittivity information valuable for planetary landing site selection is demonstrated using data from an airborne survey of the Thwaites Glacier Catchment, West Antarctica using the High Capability Airborne Radar Sounder (HiCARS). The statistical method introduced by Grima et al. (2012. Icarus 220, 84-99. http://dx. doi.org/10.1007/s11214-012-9916-y) for surface characterization is applied systematically along the survey flights. The coherent and incoherent components of the surface signal, along with an internally generated confidence factor, are extracted and mapped in order to show how a radar sounder can be used as both a reflectometer and a scatterometer to identify regions of low surface roughness compatible with a planetary lander. These signal components are used with a backscattering model to produce a landing risk assessment map by considering the following surface properties: Root mean square (RMS) heights, RMS slopes, roughness homogeneity/stationarity over the landing ellipse, and soil porosity. Comparing these radar-derived surface properties with simultaneously acquired nadir-looking imagery and laser-altimetry validates this method. The ability to assess all of these parameters with an ice penetrating radar expands the demonstrated capability of a principle instrument in icy planet satellite science to include statistical reconnaissance of the surface roughness to identify suitable sites for a follow-on lander mission.

show abstract

“…The dielectric loss ranges are reported by Chyba et al (1998), Moore (2000), and Blankenship et al (2009); the surface scattering loss ranges are reported by Berquin et al (2013); and finally the volume scattering loss ranges are reported by Heggy et al (2006), Grimm et al (2006), and Boisson et al (2011).…”

Section: Penetration Depth In Icy Moonsmentioning

confidence: 97%