NASA NTRS · 20100019280
Geometric Model of a Coronal Cavity
Abstract
We observed a coronal cavity from August 8-18 2007 during a multi-instrument observing campaign organized under the auspices of the International Heliophysical Year (IHY). Here we present initial efforts to model the cavity with a geometrical streamer-cavity model. The model is based the white-light streamer mode] of Gibson et a]. (2003 ), which has been enhanced by the addition of a cavity and the capability to model EUV and X-ray emission. The cavity is modeled with an elliptical cross-section and Gaussian fall-off in length and width inside the streamer. Density and temperature can be varied in the streamer and cavity and constrained via comparison with data. Although this model is purely morphological, it allows for three-dimensional, multi-temperature analysis and characterization of the data, which can then provide constraints for future physical modeling. Initial comparisons to STEREO/EUVI images of the cavity and streamer show that the model can provide a good fit to the data. This work is part of the effort of the International Space Science Institute International Team on Prominence Cavities
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Kucera, Therese A., Gibson, S. E., Ratawicki, D., Dove, J., deToma, G., Hao, J., Hudson, H. S., Marque, C., McIntosh, P. S., Reeves, K. K., Schmidt, D. J., Sterling, A. C., Tripathi, D. K., Williams, D. R., Zhang, M.. 2010-05-23. Geometric Model of a Coronal Cavity. https://ntrs.nasa.gov/citations/20100019280
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