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Boulder Fall Activity in the Jezero Crater, Mars
Vijayan, S.; Mangold, N.; Bhardwaj, Anil +5 more
Jezero crater is the landing site for the Mars 2020 Perseverance rover. We report 63 boulder fall tracks within the crater using High-Resolution Imaging Science Experiment (HiRISE) images. The boulder tracks have both fresh and faded morphologies similar to those reported elsewhere on Mars, but reported for the first time in Jezero crater. We comb…
The Ice Content of the Dorsa Argentea Formation From Radar Sounder Data
Plaut, Jeffrey J.; Whitten, Jennifer L.; Campbell, Bruce A.
The Dorsa Argentea Formation (DAF) is an extensive Hesperian plains unit in the south polar region of Mars that was once ice rich and may still contain a substantial fraction of water ice. Given its 3.5-Ga age, the possibility for massive ice in the DAF has significant implications for the preservation of volatiles during large obliquity changes. …
Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko
Goldstein, R.; Goetz, Charlotte; LLera, K. +1 more
Observations near comet 67P by Rosetta show evidence of charged nanograins. Specifically, the ion and electron sensor (IES) observed negative particles with energy/charge (E/q) consistent with charged nanograins. However, theory predicts that both polarities should be present. On 19 September 2014, IES detected positively and negatively charged pa…
Radar Sounding of Subsurface Structure in Eastern Coprates and Capri Chasmata, Mars
Kasaba, Yasumasa; Kumamoto, Atsushi; Oura, Aina +5 more
We surveyed the subsurface structure in eastern Coprates and Capri Chasmata in the equatorial region using high-resolution visible images, digital terrain models, and radar sounding data. We identified subsurface reflectors in four areas of the chasmata. At the stratigraphic exposure on the chasmata walls, the corresponding depth of the reflector …
High-Spatiotemporal Resolution Observations of Jupiter Lightning-Induced Radio Pulses Associated With Sferics and Thunderstorms
Wong, Michael H.; Bolton, Scott J.; Levin, Steven M. +6 more
Jupiter lightning discharges produce various kinds of phenomena including radio wave pulses at different frequencies. On 6 April 2019, the Juno Waves instrument captured an extraordinary series of radio pulses at frequencies below 150 kHz on timescales of submilliseconds. Quasi-simultaneous multi-instrument data show that the locations of their ma…