Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33a..09k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33A-09
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7594 Instruments And Techniques, 2400 Ionosphere (6929), 2439 Ionospheric Irregularities, 2494 Instruments And Techniques
Scientific paper
The ionospheric irregularities are the major source of uncertainty in image synthesis process of grand-based interferometric radio telescopes under a few GHz. The fluctuation alters both the phase and amplitude of the signals reaching the interferometer elements, and it results in positional shift and distortion of the source structure in the synthesized image, which is very difficult to isolate from the true properties of the source. In general, the ionospheric effect is calibrated for with the observation of guide stars for other low-frequency radio telescopes such as VLA (74MHz) and LOFAR. However, this method is not likely to be effective to FASR due to the low sensitivity of the receiver instrument to observe guide stars. We will present the estimated spatial and temporal characteristics of the small- and medium-scale fluctuation of the ionosphere at the proposed construction site of FASR based on the literature review of the relevant studies, and then discuss the simulation result on its impact on the synthesized beam pattern of the array. Based on these results, we will propose the calibration system of the ionospheric fluctuation for FASR. The system will utilize the information from the slant path TEC measurements from GPS and beacon satellite signals and also the ionospheric model based on physics of the ionospheric waves and turbulence sources and sinks. We will also discuss the possibilities of using the multi-frequency observation capability of the FASR and of collaboration with other solar radio telescopes.
Kawakubo H.
Ruf Christopher S.
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