34th Solar Physics Division Meeting, June 2003
Session 20 Instrumentation
Poster, Wednesday, June 18, 2003, 3:30-5:00pm, Mezzanine

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[20.16] Coronal Magnetography with the Frequency Agile Solar Radiotelescope

D. E. Gary, J. Lee (New Jersey Institute of Technology)

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.

If you would like more information about this abstract, please follow the link to http://www.ovsa.njit.edu/fasr. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: dgary@njit.edu

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.