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This paper studies the probable roles of interplanetary and geomagnetic parameters in the generation of ‘intense’ and ‘very intense’ magnetic storms as well as the correlation between magnetic field B and flow speed V , southward turning of Bz ( B s ) and B s duration B T . 18 storm events were observed and for analysis were divided into two sections. This include 8 ‘intense’ magnetic storm (−250 nT ≤ peak D st < −100 nT) events and 10 ‘Very intense’ storms (peak D st < −250 nT); both spanning January 1976 until May 2005. From our analysis, it was observed that the interplanetary magnetic field B z plays a prominent role alongside D st in the generation of intense storms. So also is the interplanetary electric field associated with high-speed streams and the solar wind density N p in the ring current intensification. The result further shows that over 67% of the storm events under investigation are generated from magnetic clouds which are characterized by a low beta plasma, high IMF magnitude and large scale coherent field rotations often including large and steady north-south components.As regards the geoeffectiveness of the flow speed V , the B s and B s interval ( B T ) with the magnetic field B , it was observed that generally for all the selected storm events, the flow speed is the most correlated, showing a correlation coefficient of 50.9% with B, and hence the most geoeffective. However, the statistical significance of its correlation with B is not so directly implying a higher substorm occurrence during the faster solar wind, but that it is one of the causes of substorm occurrence at a value faster than 400 km/s. Furthermore, the result shows that ‘very intense’ storms whose main feature is a plasma flow speed greater than 550 km/s has a negligible or very low correlation between the flow speed and the magnetic field B ; whereas, ‘intense’ storms have a 58.7% correlation between the two parameters. Lastly, it could be argued that all ‘very intense’ storms are likely to have a plasma flow speed greater than 550 km/s within the storm interval, but not all flow speed greater than 550 km/s are ‘very intense’ storms.

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Investigation Review of Economics and Statistics 1979 61 327 333 IMF

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Fleming, J. M. (1962): Domestic Financial Policies under Fixed and Floating Exchange Rates. IMF Staff Papers , 9: 369–379. Fleming J. M

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Acta Oeconomica
Authors: José Augusto Lopes Da Veiga, Alexandra Ferreira-Lopes, Tiago Neves Sequeira, and Marcelo Serra Santos

in Low-Income Countries . IMF Working Paper, No. 03/249 . Devarajan , S. – Swaroop , V. – Zou , H. ( 1996 ): The Composition of Public Expenditure and Economic Growth

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Abiad A. — Dell’Ariccia G. — Li B. (2011): Credit-less Recoveries. IMF Working Paper 11/58. Li B. Credit-less Recoveries

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. Center for Economic Policy Research: London. Fiscal Policy in Europe 1991-2003: An Evidence-Based Analysis. IMF (2001): Fiscal

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): Putting Macroprudential Policy to Work. De Nederlandsche Bank, Occasional Studies , 12 ( 7 ): 78 – 93 . IMF ( 2000 ): Macroprudential Indicators of Financial System Soundness . Occasional Paper , No. 192

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Inflation Targeting? IMF Working Paper , No. 99/41. Ciżkowicz , P. – Rzońca, A. ( 2003 ): Uwagi do artykułu Eugeniusza Kwiatkowskiego, Leszka Kucharskiego i Tomasza Tokarskiego pt

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. Ten Lessons about Budget Consolidation 2007 IMF, Independent Evaluation Office (2004): The IMF and Argentina, 1991–2001 . Washington

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Bakker, B.B. - Gulde, A.M. (2010): The Credit Boom in the EU New Member States: Bad Luck or Bad Policies? IMF Working Paper , 10/130. Gulde AM

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