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<article language="en">
	<journal>
		<journal_title>Nonlinear Processes  in Geophysics</journal_title>
		<journal_url>www.nonlin-processes-geophys.net</journal_url>
		<issn>1023-5809</issn>
		<eissn>1607-7946</eissn>
		<volume_number>15</volume_number>
		<issue_number>1</issue_number>
		<publication_year>2008</publication_year>
	</journal>
	<doi>10.5194/npg-15-53-2008</doi>
	<article_url>http://www.nonlin-processes-geophys.net/15/53/2008/</article_url>
	<abstract_html>http://www.nonlin-processes-geophys.net/15/53/2008/npg-15-53-2008.html</abstract_html>
	<fulltext_pdf>http://www.nonlin-processes-geophys.net/15/53/2008/npg-15-53-2008.pdf</fulltext_pdf>
	<start_page>53</start_page>
	<end_page>59</end_page>
	<publication_date>2008-02-05</publication_date>
	<article_title content_type="html">The influence of solar wind turbulence on geomagnetic activity</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>D. Jankovičovà</name>
			<email>dja@ufa.cas.cz</email>
		</author>
		<author numeration="2" affiliations="1,2">
			<name>Z. Vörös</name>
		</author>
		<author numeration="3" affiliations="3">
			<name>J. Šimkanin</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic</affiliation>
		<affiliation numeration="2" content_type="html">Space Research Institute, Austrian Academy of Science, Graz, Austria</affiliation>
		<affiliation numeration="3" content_type="html">Geophysical Institute, Academy of Sciences of the Czech Republic, Prague, Czech Republic</affiliation>
	</affiliations>
	<abstract content_type="html">The importance of space weather and its forecasting is growing as
interest in studying geoeffective processes in the Sun &amp;ndash; solar wind &amp;ndash;
magnetosphere &amp;ndash; ionosphere coupled system is increasing.
In this paper higher order statistical moments of interplanetary
magnetic field and geomagnetic SYM-H index fluctuations are
compared. The proper description of fluctuations in the solar wind
can elucidate important aspects of the geoeffectivity of upstream
turbulence and contribute to our understanding of space weather.
Our results indicate that quasi-stationary intervals during both
quiet and stormy periods have to be investigated
in order to find correlations between upstream
and geomagnetic conditions. We found that
the fourth statistical moment (kurtosis), which was not considered
in previous studies, appears to be a new geoeffective parameter.
Intermittency of the magnetic turbulence in the solar wind can influence
the efficiency of the solar wind &amp;ndash; magnetosphere coupling through
affecting magnetic reconnection at the Earth&apos;s magnetopause.</abstract>
	<references>
		<reference numeration="1" content_type="text"> Baker, D. N., Pulkkinen, T. I., Angelopoulos, V., Baumjohann, W., and McPherron, R. L.: The neutral line model of substorms: Past results and present view, J. Geophys. Res., 101(A6), 12 975&amp;ndash;13 010, 1996. </reference>
		<reference numeration="2" content_type="text"> Balogh, A., Forsyth, R. J., Lucek, E. A., Horbury, T. S., and Smith, E. J.: Heliospheric magnetic field polarity inversions at high heliographic latitudes, Geophys. Res. Lett., 26, 631&amp;ndash;634, 1999. </reference>
		<reference numeration="3" content_type="text"> Bavassano, B., Woo, R., and Bruno, R.: Heliospheric plasma sheet and coronal streamers, Geophys. Res. Lett., 24, 1655&amp;ndash;1658, 1997. %</reference>
		<reference numeration="4" content_type="text"> %Belcher, J. W. and Davis, L.: Large-amplitude Alfvén waves in the interplanetary medium, %J. Geophys. Res., 76, 3534&amp;ndash;3563, 1971. </reference>
		<reference numeration="5" content_type="text"> Belcher, J. W. and Solodyna, C. V.: Alfvén waves and directional discontinuities in the interplanetary medium, J. Geophys. Res., 80, 181&amp;ndash;186, 1975. </reference>
		<reference numeration="6" content_type="text"> Borovsky, J. E. and Funsten, H. O.: Role of solar wind turbulence in the coupling of the solar wind to the Earth&apos;s magnetosphere, J. Geophys. Res., 108(A6), 1246, doi:10.1029/2002JA009601, 2003 (referred as 2003a). </reference>
		<reference numeration="7" content_type="text"> Borovsky, J. E. and Funsten, H. O.: MHD turbulence in the Earth&apos;s plasma sheet: Dynamics, dissipation and driving, J. Geophys. Res., 108(A7), 1284, doi:10.1029/2002JA009625, 2003 (referred as 2003b). %</reference>
		<reference numeration="8" content_type="text"> %Bruno, R.: Observations of MHD turbulence in the solar wind, %Il Nuovo Cimento, 20C, 881&amp;ndash;896, 1997. %</reference>
		<reference numeration="9" content_type="text"> %Bruno, R., Bavassano, B., Pietropaolo, E., and Carbone, V.: %On the radial evolution of the anisotropy of solar wind fluctuations, %Solar wind Nine, Habbal, S. R., Esser, R., Hollweg, J. V., and Isenberg, P. A. (Eds.), CP471, 1999 %(referred as 1999a). %</reference>
		<reference numeration="10" content_type="text"> %Bruno, R., Bavassano, B., Pietropaolo, E., Carbone, V., and Veltri, P.: %Effects of intermittency on interplanetary velocity and magnetic field %fluctuations anisotropy, Geophys. Res. Lett., 26, 3185&amp;ndash;3188, 1999 (referred as 1999b). %</reference>
		<reference numeration="11" content_type="text"> %Bruno, R., Carbone, V., Sorriso-Valvo, L., %and Bavassano, B.: Radial evolution of solar wind %intermittency in the inner heliosphere, %J. Geophys. Res., 108, 1130, doi:10.1029/2002JA009615, 2003. </reference>
		<reference numeration="12" content_type="text"> Bruno, R. and Carbone, V.: The solar wind as a turbulence laboratory, Living Rev. Solar Phys., 4, 1&amp;ndash;186, 2005. %</reference>
		<reference numeration="13" content_type="text"> %Bruno, R., Bavassano, B., D&apos;Amicis, R., Carbone, V., %Sorriso-Valvo, L., and Pietropaolo, E.: On the radial %evolution of Alfvénic turbulence in the solar wind, %Space Science Reviews, 122, 321&amp;ndash; 328, 2006. %</reference>
		<reference numeration="14" content_type="text"> %Burlaga, L.: Interplanetary Magnetohydrodynamics, Oxford University Press, Oxford, %1995. %</reference>
		<reference numeration="15" content_type="text"> %Burlaga, L. F. and Vinas A. F.: Multiscale structure of the magnetic %field and speed at 1 AU during the declining phase of solar cycle 23 %described by a generalized Tsallis probability density function, %J. Geophys. Res., 109, A12107, doi:10.1029/2004JA010763, 2004. </reference>
		<reference numeration="16" content_type="text"> Burton, R. K., McPherron, R. L., and Russell, T. C.: An empirical relationship between interplanetary conditions and Dst, J. Geophys. Res., 80(31), 4204&amp;ndash;4214, 1975. </reference>
		<reference numeration="17" content_type="text"> Chian, A. C., Kamide, L. Y., Rempel, E. L., and Santana, W. M.: On the chaotic nature of solar-terrestrial environment: Interplanetary Alfvén intermittency, J. Geophys. Res., 111, A07S03, doi:10.1029/2005JA011396, 2006. %</reference>
		<reference numeration="18" content_type="text"> %Coleman, P. J.: Variations in the interplanetary magnetic field: Mariner 2, %J. Geophys. Res., 71, 5509, 1966. </reference>
		<reference numeration="19" content_type="text"> D&apos;Amicis, R., Bruno, R., and Bavassano, B.: Is geomagnetic activity driven by solar wind turbulence?, Geophys. Res. Lett., 34, L05108, doi:10.1029/2006GL028896, 2007. </reference>
		<reference numeration="20" content_type="text"> Forsyth, F. J., Balogh, A., Horbury, T. S. and Smith, E. J.: The heliospheric magnetic field at solar minimum as observed by ULYSSES, Adv. Space Res., 19, 839&amp;ndash;842, 1997. </reference>
		<reference numeration="21" content_type="text"> Forsyth, B. and Breen, A.: The 3D Sun and heliosphere at solar maximum, meeting report, Astron. Geophys., 43(3), p 3.32., doi:10.1046/j.1468-4004.2002.43332.x, 2002. </reference>
		<reference numeration="22" content_type="text"> Frisch, U.: Turbulence: The legacy of A.N. Kolmogorov, Cambridge University Press, Cambridge, UK; New York, USA, 1995. %</reference>
		<reference numeration="23" content_type="text"> %Goldstein, M. and Roberts, D.: Magnetohydrodynamic turbulence in the solar wind, %Annu. Rev. Astron. Astrphys., 33, 283&amp;ndash;325, 1995. </reference>
		<reference numeration="24" content_type="text"> Horbury, T. S. and Tsurutani, B.: Ulysses measurements of waves, turbulence and discontinuities, in: The Heliosphere Near Solar Minimum: The Ulysses perspective, edited by: Balogh, A., Marsden, R. G., and Smith, E. J., Springer-Praxis Books in Astrophysics and Astronomy, Springer, London, UK; New York, USA, 167&amp;ndash;227, 2001. </reference>
		<reference numeration="25" content_type="text"> Jankovi&amp;#x010D;ová, D., Dolinsk\&apos;y, P., Valach, F., and Vörös, Z.: Neural network based nonlinear prediction of magnetic storms, J. Atmos. Sol.-Terr. Phys., 64, 651&amp;ndash;656, 2002. %</reference>
		<reference numeration="26" content_type="text"> %Lazarian, A., Petrosian, V., Yan, H., and Cho, J.: Physics of gamma-ray bursts, turbulence, %energy transfer and reconnection, School/Conference on Beaming and Jets in Gamma Ray Bursts (NBSI), %Copenhagen, August 2002, Ouyed, R. (Ed.), 45, 2003. </reference>
		<reference numeration="27" content_type="text"> O&apos;Brien, T. P. and McPherron, R. L.: An empirical phase space analysis of ring current dynamics: Solar wind control of injection and decay, J. Geophys. Res., 105(A4), 7707&amp;ndash;7719, 2000. </reference>
		<reference numeration="28" content_type="text"> Oughton, S., Transport of solar wind fluctuations: A turbulence approach, PhD Thesis, Delaware University, Wilmington, USA, 1993. %</reference>
		<reference numeration="29" content_type="text"> %Roberts, D., Klein, L., Goldstein, M., and Matthaeus, W.: %The nature and evolution of magnetohydrodynamic fluctuations in the solar wind: %Voyager observations, J. Geophys. Res., 92, 11021&amp;ndash;11040, 1987. </reference>
		<reference numeration="30" content_type="text"> Sorriso-Valvo, L., Carbone, V., Veltri, P., Consolini, G., and Bruno, R.: Intermittency in the solar wind turbulence through probability distribution functions of fluctuations, Geophys. Res. Lett., 26, 1801&amp;ndash;1804, 1999. %</reference>
		<reference numeration="31" content_type="text"> %Sorriso-Valvo, L., Carbone, V., Giuliani, P., Veltri, P., Bruno, R., Antoni, V., %and Martines, E.: Intermittency in plasma turbulence, Planet. Space Sci., 49, 1193&amp;ndash;1200, %2001. </reference>
		<reference numeration="32" content_type="text"> Tu, C. Y. and Marsch, E.: MHD structures, waves and turbulence in the solar wind: observations and theories, Space Sci. Rev., 73, 1&amp;ndash;210, 1995. </reference>
		<reference numeration="33" content_type="text"> Vassiliadis, D., Sharma, A. S., and Papadopoulos, K.: An empirical model relating the auroral geomagnetic activity to the interplanetary magnetic field, Geophys. Res. Lett., 20, 1731&amp;ndash;1734, 1993. </reference>
		<reference numeration="34" content_type="text"> Vörös, Z. and Jankovi&amp;#x010D;ová, D.: Neural network prediction of geomagnetic activity: a method using local Hölder exponent, Nonlin. Processes Geophys., 9, 425&amp;ndash;433, 2002. </reference>
		<reference numeration="35" content_type="text"> Zank, G. P. and Matthaeus, W. H.: Waves and turbulence in the solar wind, J.Geophys. Res., 97, 17189&amp;ndash;17194, 1992. </reference>
		<reference numeration="36" content_type="text"> Zweben, S. J., Manyuk, C. R. and Taylor, R. J.: Small-Scale Magnetic Fluctuations Inside the Macrotor Tokamak, Phys. Rev. Lett., 42, p 1720, doi: 10.1103/PhysRevLett.42.1720.3, 1979. </reference>
	</references>
</article>

