Hnat, B., Chapman, Sandra C., Rowlands, G. (George), Watkins, Nicholas W. and Freeman, M. P. (Mervyn P.). (2003) Scaling in long term data sets of geomagnetic indices and solar wind ϵ as seen by WIND spacecraft. Geophysical Research Letters, Vol.30 (No.22). ISSN 0094-8276

Preview

PDF WRAP_Hnat_Scaling_long.pdf - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Download (272Kb)

Abstract

We study scaling in fluctuations of the geomagnetic indices (AE, AU, and AL) that provide a measure of magnetospheric activity and of the ε parameter which is a measure of the solar wind driver. Generalized structure function (GSF) analysis shows that fluctuations exhibit self-similar scaling up to about 1 hour for the AU index and about 2 hours for AL, AE and ε when the most extreme fluctuations over 10 standard deviations are excluded. The scaling exponents of the GSF are found to be similar for the three AE indices, and to differ significantly from that of ε. This is corroborated by direct comparison of their rescaled probability density functions.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Solar wind, Geomagnetic indexes, Magnetosphere
Journal or Publication Title:	Geophysical Research Letters
Publisher:	American Geophysical Union
ISSN:	0094-8276
Date:	2003
Volume:	Vol.30
Number:	No.22
Identification Number:	10.1029/2003GL018209
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
References:	Angelopoulos, V., et al., Bursty bulk flows in the inner central plasma sheet, J. Geophys. Res., 59, 4027–4039, 1992. Chang, T., S. W. Y. Tam, and C. C. Wu, Complexity induced anisotropic bimodal intermittent turbulence in space plasmas, Phys. Plasmas, in press, 2003. Chapman, S. C., and N. W. Watkins, Avalanching and self-organised criticality: A paradigm for magnetospheric dynamics?, Space Sci. Rev., 95, 293– 307, 2001. Consolini, G., and P. De Michelis, Non-Gaussian distribution function of AE-index fluctuations: Evidence for time intermittency, Geophys. Res. Lett., 25, 4087–4090, 1998. Consolini, G., M. F. Marcucci, and M. Candidi, Multifractal structure of auroral electrojet index data, Phys. Rev. Lett., 76, 4082– 4085, 1996. Edwards, J. W., A. S. Sharma, and M. I. Sitnov, Spatio-temporal Structure of Geomagnetic Activity Triggered by Dynamic Pressure Pulses: Mutual Information Functional Analysis, Bull. Amer. Phys. Soc., 27, 156, 2001. Freeman, M. P., N. W. Watkins, and D. J. Riley, Evidence for a solar wind origin of the power law burst lifetime distribution of the AE indices, Geophys. Res. Lett., 27, 1087– 1090, 2000. Frisch, U., Turbulence, The legacy of A.N. Kolmogorov, Cambridge University Press, Cambridge, 1995. Hnat, B., S. C. Chapman, G. Rowlands, N. W. Watkins, and M. P. Freeman, Scaling in solar wind epsilon and the AE, AL and AU indices as seen by WIND, Geophys. Res. Lett., 29(10), doi:10.1029/2002GL016054, 2002. Hnat, B., S. C. Chapman, G. Rowlands, N. W. Watkins, and M. P. Freeman, Correction to ‘‘Scaling in solar wind epsilon and the AE, AL and AU indices as seen by WIND’’, Geophys. Res. Lett., 30(10), doi:10.1029/ 2003GL017194, 2003a. Hnat, B., S. C. Chapman, and G. Rowlands, Intermittency, scaling, and the Fokker-Planck approach to fluctuations of the solar wind bulk plasma parameters as seen by the WIND spacecraft, Phys. Rev. E, 67, 056404, 2003b. Katsev, S., and L’Heureux, Are Hurst Exponents Estimated from Short and Irregular Time Series Meaningful?, Computers and Geosciences, in press, 2003. Kova´cs, P., V. Carbone, and Z. Vo¨ro¨s, Wavelet-based filtering of intermittent events from geomagnetic time series, Planet. Space Sci., 49, 1219– 1231, 2001. Lepping, R. P., et al., The WIND Magnetic Field Investigation, Space Sci. Rev., 71, 207, 1995. Lui, A. T. Y., et al., Is the Dynamic Magnetosphere an Avalanching System?, Geophys. Res. Lett., 27, 911– 914, 2000. Mandelbrot, B. B., Gaussian Self-Affinity and Fractals: Globality, The Earth, 1/f Noise and R/S, Springer-Verlag, Berlin, 2002. Mantegna, R. N., and H. E. Stanley, Scaling Behavior in the Dynamics of an Economic Index, Nature, 376, 46, 1995. Ogilvie, K. W., et al., SWE, a comprehensive plasma instrument for the wind spacecraft, Space Sci. Rev., 71, 55– 77, 1995. Rodrı´guez-Iturbe, I., and A. Rinaldo, Fractal River Basins: Chance and Self-Organization, Cambridge University Press, Cambridge, 1997. Sitnov, M. I., et al., Phase transition-like behavior of the magnetosphere during substorms, J. Geophys. Res., 105, 12,955– 12,974, 2000. Takalo, J., J. Timonen, and H. Koskinen, Correlation dimension and affinity of AE data and bicolored noise, Geophys. Res. Lett., 20, 1527– 1530, 1993. Takalo, J., and J. Timonen, Comparison of the dynamics of the AU and PC indices, Geophys. Res. Lett., 25, 2101– 2104, 1998. Tsurutani, B. T., et al., The nonlinear response of AE to the IMF Bs driver: A spectral break at 5 hours, Geophys. Res. Lett., 17, 279– 282, 1990. Ukhorskiy, A. Y., M. I. Sitnov, A. S. Sharma, and K. Papadopoulos, On the origin of the power-law spectra in magnetospheric dynamics during substorms, J. Geophys. Res., submitted, 2002. Uritsky, V. M., A. J. Klimas, and D. Vassiliadis, Comparative study of dynamical critical scaling in the auroral electrojet index versus solar wind fluctuations, Geophys. Res. Lett., 28, 3809– 3812, 2001. Vo¨ro¨s, Z., P. Kova´cs, A ´ . Juha´sz, A. Ko¨rmendi, and A. W. Green, Scaling laws from geomagnetic time series, Geophys. Res. Lett., 25, 2621– 2624, 1998. Watkins, N. W., M. P. Freeman, C. S. Rhodes, and G. Rowlands, Ambiguities in determination of self-affinity in the AE-index time series, Fractals, 9, 471– 479, 2001.
URI:	http://wrap.warwick.ac.uk/id/eprint/3876

Request changes to a record

Actions (login required)

View Item