Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715502m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #155.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We will present results from recent spectroscopic imaging observations of the solar corona obtained with the Murchison Widefield Array (MWA) Prototype interferometer. The 32-element MWA Prototype operates between 80-300 MHz and is a precursor to the full 512-element MWA that is currently under construction in Western Australia. The combination of high spectral resolution and high dynamic range imaging capabilities afforded by the MWA Prototype are already providing a wealth of new insights into the dynamic nature of the radio Sun. For example, during two separate days in late March 2010 (characterized as "quiet" to "very quiet" by the NOAA Space Weather Prediction Center), we have detected modest level broad-band bursts that are similar to classic Type III bursts in their duration and peak wavelengths. On one of these days, we also detected and imaged numerous short-lived, narrow-band events whose nature is clearly non-thermal, but whose properties, to our knowledge, do not match those of any other previously reported class of radio burst. All of the temporally variable features appear to be linked with x-ray-bright active regions. In some cases, we also observe circularly polarized emission at these locations. Our observations and analysis are ongoing, and we will use these and other new results to illustrate the powerful new capabilities for solar and heliospheric research that will be provided by the full MWA over the next several years. This research was supported by a grant from the National Science Foundation.
Kennedy Rachel
Matthews Lynn Diane
Murchison Widefield Array Team
Oberoi Divya
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