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Proposal Identification No.:

R2955 Arecibo Observatory

Date Received: 2014-Aug-01 12:55:16 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Planetary Radar Radar Solar System 24

4 less than 100 GB

Lunar Subsurface Radar Mapping at 70-cm Wavelength

We request 24 hours of Arecibo-GBT time to acquire targeted 70-cm wavelength, dual-polarization radar backscatter maps of the Moon. The new observations will use a 1-us baud length and about 5 hours of integration time on each target to achieve 200-m spatial resolution with 8 looks per pixel. We recently published a study of Mare Serenitatis using such data, revealing unseen details of lava flow complexes, possible channels and tubes, and early mare tectonic features. Data collected for Mare Imbrium delineate lava flow outlines never before evident, allowing comparisons to the scales of similar features on Earth and Mars. Our new observations will use the same techniques to study volcanic deposits in the Mons Rumker region, map lava flow features across Mare Humorum and Mare Nubium, and probe the north polar region to investigate published claims of thick ice deposits in small craters. Outreach Abstract: We are using the Arecibo Observatory 70-cm radar system to make maps of the Moon that can distinguish features as small as 200 m across. At this radar wavelength, the echoes from the Moon come from up to 10 m or more beneath the surface, revealing ancient volcanic and impact features hidden by the widespread lunar dust. Our targets include strange volcanic domes formed as the Moon was losing its remaining heat, vast lava plains that fill impact basins, and areas near the north pole that may hide deposits of water ice.

Name Bruce Campbell Donald Campbell

Institution Smithsonian Institution Cornell University

E-mail campbellb@si.edu campbell@astro.cornell.edu

Phone 202 633 2472 607 225 9580

Student no no

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Additional Authors
Michael Nolan, nolan@naic.edu Gareth Morgan, morganga@si.edu

This work is not part of a thesis.

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Section I I - Time Request
The following times are in UT. For these observations night-time is not needed.

Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Time requests will require coordination with the GBT. Suggested observing windows are listed in the proposal text. These Observations do not require dual beam configuration.

Section I I I - Instruments Needed
430 Xmit Atmospheric Observation Instruments:

Sp ecial Equipment or setup: No receiving at Arecibo, so no data recording requirements.

Section IV - RFI Considerations
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Frequency Ranges Planned

Section V - Observing List Target List
Moon

3