Radar mapping of Mercury's polar anomalies

@article{Harmon1994RadarMO,
  title={Radar mapping of Mercury's polar anomalies},
  author={John K. Harmon and Martin A. Slade and R. Velez and Arturo Crespo and Murray Dryer and J. M. Johnson},
  journal={Nature},
  year={1994},
  volume={369},
  pages={213-215}
}
GROUND-based radar observations of Mercury have revealed unusually strong, highly depolarized echoes from the north1,2 and south2 poles. These anomalous echoes have been cited as evidence of polar ice deposits1–5. Thermal studies3–5 suggest that the permanently shaded floors of large polar craters are cold enough to preserve water ice in a stable state over aeons, in spite of Mercury's proximity to the Sun. Here we present high-resolution radar maps of Mercury's polar regions, derived from… 
Investigating Mercury's South Polar Deposits: Arecibo Radar Observations and High‐Resolution Determination of Illumination Conditions
TLDR
New Arecibo radar observations of Mercury's south pole are presented, which reveal numerous radar-bright deposits and substantially increase the radar imaging coverage, and images from MESSENGER's full mission are used to determine the illumination conditions ofMercury's south polar region at the same spatial resolution as the north polar region, enabling comparisons between the two poles.
High-Resolution Radar Imaging of Mercury's North Pole
Abstract The recently upgraded Arecibo S-band (λ12.6-cm) radar was used to make delay-Doppler images of Mercury's north polar region, where earlier observations had shown strong echoes from putative
Areas of permanent shadow in Mercury's south polar region ascertained by MESSENGER orbital imaging
Radar‐bright features near Mercury's poles have been postulated to be deposits of water ice trapped in cold, permanently shadowed interiors of impact craters. From its orbit about Mercury, MESSENGER
How Thick Are Mercury's Polar Water Ice Deposits?
Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury’s North Polar Deposits
Ground-based planetary radar observations first revealed deposits of potentially nearly pure water ice in some permanently shadowed regions (PSRs) on Mercury’s poles. Later, the MESSENGER spacecraft
Radar Imaging of Mercury
Abstract Earth-based radar has been one of the few, and one of the most important, sources of new information about Mercury during the three decades since the Mariner 10 encounters. The emphasis
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