Mapping Natural and Man-made Radio Interference at the Moon: Wind Waves RAD2 Data

Details Mapping Natural and Man-made Radio Interference at the Moon: Wind Waves RAD2 Data Mapping Natural and Man-made Radio Interference at the Moon: Wind Waves RAD2 Data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p23c1268m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P23C-1268

Astronomy and Astrophysics

Astrophysics

[6250] Planetary Sciences: Solar System Objects / Moon, [6914] Radio Science / Electromagnetic Noise And Interference, [6954] Radio Science / Radio Astronomy, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions

Scientific paper

The lunar surface is frequently identified as a preferred site for large, low-frequency (<50-100 MHz) interferometric radio observatories. Compared to ground-based facilities limited to above 10 MHz by ionospheric absorption, the Moon has essentially no ionosphere. Observations of radio sources at frequencies below 100 kHz would be possible. Compared to a free-flying spacecraft constellation, the lunar surface provides a surface for deploying antennas, after which the antenna metrology is not an issue. Also compared to the spacecraft constellation, the moon offers a “backstop” that can block unwanted radio emissions from the sun or, for a far-side array, from man-made transmitters on Earth as well as terrestrial auroral radio emissions. We present an analysis of the Wind Waves RAD2 radio data set for the frequency range 1-14 MHz. These data, acquired from November 1994 through the present, document the radio bursts and terrestrial emissions observed by Wind along a complex trajectory that included passes very close to the Moon. Thus, we can build a statistical “map” of terrestrial radio emissions as a function of local time of the Moon relative to earth, the inclination of the moon’s orbit, and frequency. These data demonstrate that successful radio observations of cosmological sources from anywhere near Earth will be best accomplished by an observatory on the far-side of the Moon. The data also provide statistics regarding interference from solar radio emissions, including variations as a function of the solar cycle, with any observations requiring high sensitivity.

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