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 .