Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp43a..09t&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP43A-09
Physics
6924 Interferometry, 6994 Instruments And Techniques, 7594 Instruments And Techniques
Scientific paper
The proposed Frequency-Agile Solar Radiotelescope (FASR) is to produce high space, time, and frequency resolution full disk solar images. These will allow the reconstructions of the 3-D structure of the Sun's atmosphere from chromosphere to mid-corona. The high resolutions are required to carry out detailed diagnostics of fast-moving phenomena, such as flares and CMEs, as well as of quasi-static structures above active and quiet regions. The full disk images will capture all activity in the corona, even when there are many active regions at solar maximum. One of the tasks necessary to ensure optimal imaging for the array is to determine the best antenna configuration. The current poster presents work done towards this goal. We focus on the FASR-B array, which will cover the 200-3000 MHz range with 60 to 90 antennas of 6-m diameter. We have examined the imaging characteristics for a 3 arm, log-spiral configuration with radius of about 3 km. Multi-frequency observations are simulated for arrays varying in initial antenna spacing, number of antenna elements, and number of turns for each arm. The images reconstructed from the simulated snapshot observations are compared to the original model, convolved with the appropriate beam, to see which configuration yields the most faithful images. We discuss the implications of the findings for the planning of the FASR array configurations.
Gary Dale
Tun Samuel D.
White Stephen M.
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