Comparison of various cusp models with high- and low-resolution observations |
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Authors: | M. Yamauchi R. Lundin |
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Affiliation: | (1) Swedish Institute of Space Physics, Kiruna, Sweden |
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Abstract: | Three major cusp models are systematically compared with low-resolution (large-scale) and high-resolution (fine-scale) low-altitude observations. Those models are (a) global magnetohydrodynamics (MHD) models (including MHD+drift models), (b) turbulent/diffusive entry models, and (c) direct flowing entry models. Although low-resolution data are mostly consistent with MHD models, high-resolution data mostly contradicts them. The data instead supports the other models in which the cusp is considered as a local `extra' open region. This is a good lesson to us: past supportive `tests' of MHD cusp models might have essential flaws in the methodology, and high-resolution data is necessary even for large-scale modelings. |
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Keywords: | test of models cusp direct entry MHD drift local high-resolution data |
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