ANN forecast of hourly averaged AE index based on L1 IMF and plasma measurements

• Autorzy: Amata E. , Consolini G. , Pallocchia G. , Mercucci M.
• Języki publikacji: EN

Abstrakty

EN

The AE index has two components: one driven by the solar wind and one related to the magnetotail unloading process. We recall some past findings on this issue and present a new ANN algorithm for the AE forecasting at 5 and 60 min time scales, built by adding to a previous algorithm a further layer with a hyperbolic tangent transfer function and two more inputs, the output at time t and the difference between the input at time t and the output at time t - 1. We show that, at the 60 min time scale and for AE > 400 nT, the new algorithm performs better than the former one, while no improvement is obtained at the 5 min time scale. This result confirms that the AE component driven by the solar wind can be forecast, at least partially, while the unloading component may not be reproduced from solar wind inputs.

Słowa kluczowe

EN

artificial neural network; storms and substorms; solar wind

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2009
• Tom: Vol. 57, no. 1
• Strony: 185--196
• Opis fizyczny: Bibliogr. 30 poz.

Twórcy

autor

Amata E.

autor

Consolini G.

autor

Pallocchia G.

autor

Mercucci M.

• Istituto di Fisica dello Spazio Interplanetario, INAF, Roma, Italy,

Bibliografia

• Akasofu, S.-I. (1975), The solar wind-magnetosphere dynamo and the magnetospheric substorm, Planet. Space Sci. 23, 5, 817-823,
• Akasofu, S.-I. (1979), Interplanetary energy flux associated with magnetospheric substorms, Planet. Space Sci. 27, 4, 425-431,
• Akasofu, S.-I. (2004), Several "controversial" issues on substorms, Space Sci. Rev. 113, 1-2, 1-40
• Amata, E., G. Pallocchia, G. Consolini, M.F. Marcucci, and I. Bertello (2008), Comparison between three algorithms for Dst predictions over the 2003-2005 period, J. Atmos. Sol.-Terr. Phys. 70, 2-4, 496-502
• Bargatze, L.F., D.N. Baker, R.L. McPherron, and E.W. Hones Jr. (1985), Magnetospheric impulse response for many levels of geomagnetic activity, J. Geophys. Res. 90, A7, 6387-6394,
• Chen, J., and A.S. Sharma (2006), Modeling and prediction of the magnetospheric dynamics during intense geospace storms, J. Geophys. Res. 111, A4, A04209,
• Clauer, C.R., and Y. Kamide (1985), DP1 and DP2 current systems for the March 22, 1979, substorms, J. Geophys. Res. 90, A2, 1343-1354,
• Consolini, G. (2002), Self-organized criticality: a new paradigm for the magnetotail dynamics, Fractals 10, 3, 275-283,
• Consolini, G., and P. De Michelis (2005), Local intermittency measure analysis of AE index: The directly driven and unloading component, Geophys. Res. Lett. 32, L05101,
• Davies, T.N., and M. Sugiura (1966), Auroral electrojet activity index AE and its universal time variations, J. Geophys. Res. 71, 785-801.
• Elman, J.L. (1990), Finding structure in time, Cognitive Sci. 14, 2, 179-211,
• Freeman, M.P., N.W. Watkins, and D.J. Riley (2000), Evidence for a solar wind origin of the power law burst lifetime distribution of the AE indices, Geophys. Res. Lett. 27, 8, 1087-1090,
• Gleisner, H., and H. Lundstedt (2001), Auroral electrojet predictions with dynamic neural networks, J. Geophys. Res. 106, A11, 24541-24549,
• Kamide, Y., and W. Baumjohann (1993), Magnetosphere-Ionosphere Coupling, Springer-Verlag, New York.
• Kamide, Y., and S. Kokubun (1996), Two-component auroral electrojet: Importance for substorm studies, Geophys. Res. 101, A6, 13027-13046,
• Klimas, A.J., J.A. Valdivia, D. Vassiliadis, and D.N. Baker (1998), AL index prediction using data-derived nonlinear prediction filters. In: T Chang and J.R. Jasperse (eds.), Physics of Space Plasmas, MIT Center for Theoretical Geo/Cosmo Plasma Physics, Cambridge, Massachusetts, 215.
• Pallocchia, G., E. Amata, G. Consolini, M.F. Marcucci, and I. Bertello (2008), AE index forecast at different time scales through an ANN algorithm based on L1 IMF and plasma measurements, J. Atmos. Sol.-Terr. Phys. 70, 2-4, 663-668,
• Price, C.P., and D. Prichard (1993), The non-linear response of the magnetosphere: 30 October 1978, Geophys. Res. Lett. 20, 9, 771-774,
• Rostoker, G., S.-I. Akasofu, W. Baumjohann, Y. Kamide, and R.L. McPherron (1988), The roles of direct input of energy from the solar wind and unloading of stored magnetotail energy in driving magnetospheric substorms, Space Sci. Rev. 46, 1-2, 93-111,
• Sun, W., W.-Y. Xu, and S.-I. Akasofu (1998), Mathematical separation of directly driven and unloading components in the ionospheric equivalent currents during substorms, J. Geophys. Res. 103, A6, 11695-11700
• Takalo, J., and J. Timonen (1997), Neural network prediction of AE data, Geophys. Res. Lett. 24, 19. 2403-2406,
• Temerin, M., and X. Li (2006), Dst model for 1995-2002, J. Geophys. Res. 111, A04221,
• Tsurutani, B.T., M. Sugiura, T. Iyemori, B.E. Goldstein, W.D. Gonzalez, S.I. Akasofu, and E.J. Smith (1990), The nonlinear response of AE to the IMF BS driver: A spectral break at 5 hours, Geophys. Res. Lett. 17, 3, 279-282,
• Ukhorskiy, A.Y., M.I. Sitnov, A.S. Sharma, and K. Papadopoulos (2002), Global and multiscale aspects of magnetospheric dynamics in local-linear filters, J. Geophys. Res. 107, A11, 1369,
• Ukhorskiy, A.Y., M.I. Sitnov, A.S. Sharma, and K. Papadopoulos (2003), Combining global and multi-scale features in a description of the solar windmagnetosphere coupling, Ann. Geophys. 21, 9, 1913-1929.
• Ukhorskiy, A.Y., M.I. Sitnov, A.S. Sharma, and K. Papadopoulos (2004), Global and multiscale features of solar wind-magnetosphere coupling: From modeling to forecasting, Geophys. Res. Lett. 31, 8, L08802
• Uritsky, V.M., A.J. Klimas, and D. Vassiliadis (2001), Comparative study of dynamical critical scaling in the auroral electrojet index versus solar wind fluctuations, Geophys. Res. Lett. 28, 19, 3809-3812,
• Vassiliadis, D., A.J. Klimas, D.N. Baker, and D.A. Roberts (1995), A description of the solar wind-magnetosphere coupling based on nonlinear filters, J. Geophys. Res. 100, A3, 3495-3512,
• Weimer, D.R., D.M. Ober, N.C. Maynard, W.J. Burke, M.R. Collier, D.J. McComas, N.F. Ness, and C.W. Smith (2002), Variable time delays in the propagation of the interplanetary magnetic field, J. Geophys. Res. 107, A8,
• Weimer, D.R., D.M. Ober, N.C. Maynard, M.R. Collier, D.J. McComas, N.F. Ness, C.W. Smith, and J. Watermann (2003), Predicting interplanetary magnetic field (IMF) propagation delay times using the minimum variance technique, J. Geophys. Res. 108, A1, 1026,