Forward Modeling Technique for the Reconstruction of the Solar Corona

Details Forward Modeling Technique for the Reconstruction of the Solar Corona Forward Modeling Technique for the Reconstruction of the Solar Corona

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0818t&link_type=abstract

American Astronomical Society, SPD meeting #37, #8.18; Bulletin of the American Astronomical Society, Vol. 38, p.233

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We present a forward modeling technique for the reconstruction of structures such as streamers and CMEs observed with SOHO-LASCO. This technique relies on the computation of a synthetic image of brightness from an assumed electron density model. By iteratively comparing the reconstructed model and the data image, we are able to fit the parameters of the model, such as the position, the shape aspect parameters and the electron density.Streamers are observed as bright and quasi radial shapes. We show how it is possible to determine the electron density in these regions by modeling the streamer as a simple slab. We also show that we can reconstruct its three dimensional morphology using data 7 days apart.We present a model of flux rope CME that we were able to fit to 34 structured CME events observed on SOHO-LASCO. LASCO only provides the projection of the 3D CME structure, so many parameters of our model cannot be determined directly. We made use of information provided by multiple instrument (MDI, Halpha, EIT) in order to constrain our reconstruction, and also assumed self similar expansion (Cremades and Bothmer, A&A 2004).Finally, by combining the two models, streamer and CME, we present a case study of a streamer deflected by a CME during the eruption. We show how, by using our simulation software, we can change the observer point of view and look at the modeled event as if it was seen from Earth, and compare to a halo CME.

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