A Statistical Study on the Geoeffectiveness of Magnetic Clouds During High Solar Activity Years

Details A Statistical Study on the Geoeffectiveness of Magnetic Clouds During High Solar Activity Years A Statistical Study on the Geoeffectiveness of Magnetic Clouds During High Solar Activity Years

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42a0478z&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42A-0478

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2700 Magnetospheric Physics, 2731 Magnetosphere: Outer, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

Using the Dst* index and solar wind IMF & plasma data from 1998.001 to 2002.127 in which solar activities are high, we have statistically examined the relationship of 270 storms (Dst*­š-30nT) to 104 magnetic clouds. It is found that most of the magnetic clouds can result in geomagnetic storms, but only about 30% of storms are due to magnetic clouds. A storm can be induced by the sheath, the leading, the axial, the trailing field, both the leading and trailing fields, or both the sheath and leading or trailing fields of a cloud with 9.6%, 22.1%, 8.7%, 12.5%, 1.0%, 16.4%, 5.8% occurrence percentages, respectively. However, different levels of geomagnetic activity have different occurrence percentages due to different cloud fields. The occurrence percentage of intense storms caused by clouds is 72%, which is much higher than the around 20% occurrence percentage of smaller storms caused by clouds. It is also shown that Unipolar Bz and Bipolar Bz clouds have different geoeffectiveness percentages and the long-known hypothesis of southward Bz control of magnetic activity is supported by the results of this study. Because multiple-step development storms can result not only from both sheath and cloud fields but also from different fields within a cloud, the geoeffectiveness of the fields within the clouds are statistically studied in more detail than before.

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