Limits on radio emission from meteors using the MWA

Abstract

Recently, low frequency, broadband radio emission has been observed accompanying bright meteors by the Long Wavelength Array (LWA). The broadband spectra between 20 and 60 MHz were captured for several events, while the spectral index (dependence of flux density on frequency, with $S_{\nu }\propto {\nu }^{\alpha }$) was estimated to be $-4\pm 1$ during the peak of meteor afterglows. Here we present a survey of meteor emission and other transient events using the Murchison Widefield Array (MWA) at 72-103 MHz. In our 322-hour survey, down to a $5\sigma$ detection threshold of 3.5 Jy/beam, no transient candidates were identified as intrinsic emission from meteors. We derived an upper limit of -3.7 (95% confidence limit) on the spectral index in our frequency range. We also report detections of other transient events, like reflected FM broadcast signals from small satellites, conclusively demonstrating the ability of the MWA to detect and track space debris on scales as small as 0.1 m in low Earth orbits.

arXiv commentAccepted for Publication in MNRAS on 11 April 2018, 11 pages, 11 figures, 5 tables

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Cited by in corpus (8)

• The Phase II Murchison Widefield Array: Design Overview
• Absolving the SSINS of Precision Interferometric Radio Data: A New Technique for Mitigating Faint Radio Frequency Interference
• Science with the Murchison Widefield Array: Phase I Results and Phase II Opportunities
• Quantifying Excess Power from Radio Frequency Interference in Epoch of Reionization Measurements
• A survey of spatially and temporally resolved radio frequency interference in the FM band at the Murchison Radio-astronomy Observatory
• Improved Sensitivity for Space Domain Awareness Observations with the Murchison Widefield Array
• Broadband Imaging to Study the Spectral Distribution of Meteor Radio Afterglows
• The Intensity of Diffuse Galactic Emission Reflected by Meteor Trails