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[71.02] Simulation of Microwave Emissions from Helmet Streamer

S. D. Tun, D. E. Gary, J. Lee (NJIT)

Helmet streamers are an important magnetic structure on the sun in relation to prominence formation and coronal mass ejections. We investigate some methods by which the magnetic field configuration in a streamer can be reconstructed from observations with the proposed Frequency Agile Solar Radio telescope (FASR). We begin with the global coronal magnetic field model for the forward problem proposed by Judge and Low in 2004. We add a realistic coronal temperature and density model that obeys hydrostatic equilibrium and allows gyroresonance emission to dominate the free-free emission at a selected observing frequency. Theoretical brightness temperature maps are created from the model at multi-frequencies and are then sampled using AIPS to simulate observations with the FASR. The magnetic field structure reconstructed from the simulated observations is compared with the original input configuration as a test of our diagnostics on the magnetic field.

This work is supported by the NSF grants AST-0138317 and ATM-0077273 to New Jersey Institute of Technology.

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Bulletin of the American Astronomical Society, 36 #2
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