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Quantitative Assessment of Tsyganenko Models at Geosynchronous Orbit

Quantitative Assessment of Tsyganenko Models at Geosynchronous Orbit. Chia-Lin Huang* and Harlan Spence Boston University Howard Singer NOAA Nicolai Tsyganenko University of St. Petersburg

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Quantitative Assessment of Tsyganenko Models at Geosynchronous Orbit

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  1. Quantitative Assessment of Tsyganenko Models at Geosynchronous Orbit Chia-Lin Huang* and Harlan Spence Boston University Howard Singer NOAA Nicolai Tsyganenko University of St. Petersburg Huang, C.-L., H. E. Spence, H. J. Singer, and N. A. Tsyganenko (2008), A quantitative assessment of empirical magnetic field models at geosynchronous orbit during magnetic storms, J. Geophys. Res., 113, A04208, doi:10.1029/2007JA012623.

  2. Comparison of Recent Tsgyanenko Models a IMPs, HEOS, ISEE-1 and 2 b Geotail, Polar, ISEE-2, AMPTE/CCE, AMPTE/IRM, CRRES, and DE-1 c GOES-8, 9, and 10, Polar, Geotail, and Equator-S Chia-Lin Huang at 2009 RBSP SWG

  3. Statistical Study for Tsyganenko Models • 52 major storms (Dst minimum < -100 nT) from 1996 to 2004, include pre- and post-storm intervals • Data/model residual fields (∆B = BData – BModel) as functions of local time and Dst Under-estimate Perfect prediction Over-estimate Chia-Lin Huang at 2009 RBSP SWG

  4. Data/model residual fields (Dst) Chia-Lin Huang at 2009 RBSP SWG

  5. Data/model residual fields (Local time) Chia-Lin Huang at 2009 RBSP SWG

  6. Consequences of field model errors • Inaccurate B-field model could alter the results of related studies • Example, radial profiles of phase space density • Discrepancies between T models using same quiet-time inputs • Could affect calculations of non-local parameters such as K and L* 45° 35° 30 ° ~15% error in L* calculation between T96 and TS05 Chia-Lin Huang at 2009 RBSP SWG

  7. Conclusions and Future work • What makes TS05 better than the earlier Tsyganenko models? • Partial ring current • Fitted data includes more storm-time data • Time-integration effect as the input parameters • Non-linear saturation for extreme storm conditions • Each field sources has its own relaxation time and driving functions • Future validation work besides GEO: • THEMIS outside GEO and magnetopause location • RBSP for inside GEO Chia-Lin Huang at 2009 RBSP SWG

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