Coronal Magnetography with the Frequency Agile Solar Radiotelescope

Details Coronal Magnetography with the Frequency Agile Solar Radiotelescope Coronal Magnetography with the Frequency Agile Solar Radiotelescope

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.2016g&link_type=abstract

American Astronomical Society, SPD meeting #34, #20.16; Bulletin of the American Astronomical Society, Vol. 35, p.847

Computer Science

Performance

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Scientific paper

We investigate the expected performance of the proposed Frequency Agile Solar Radiotelescope (FASR) for coronal magnetography. FASR is expected to produce high quality radio images at hundreds of radio frequencies in the appropriate frequency range (1-24 GHz) to measure active region coronal magnetic fields with exquisite precision. We start with a realistic coronal active region model provided by Y. Mok (UC-Irvine), and calculate the radio emission expected from the region due to both the gyroresonance and free-free mechanisms. We then sample the model images with a candidate FASR antenna configuration and add noise, to obtain a set of multifrequency images of the same spatial resolution and quality expected from the instrument.
The resulting data-cube of two spatial and one spectral dimensions yields microwave spectra at each point in the active region, which are then inverted to obtain the active region plasma parameters (temperature, emission measure, and magnetic field strength and direction). These are finally compared to the input model, to determine the quantitative precision of the inversion. We try several inversion techniques of varying sophistication, to simulate both automated quick-look coronal magnetograms and more time-consuming, research-quality magnetograms.
This work is supported by the National Science Foundation under grant AST-0138317 to New Jersey Institute of Technology.

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