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Interplanetary origin of intense geomagnetic storms ( Dst < −100 nT) during solar cycle 23
Author(s) -
Gonzalez W. D.,
Echer E.,
CluaGonzalez A. L.,
Tsurutani B. T.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028879
Subject(s) - interplanetary spaceflight , geomagnetic storm , solar cycle 23 , solar cycle 22 , interplanetary magnetic field , physics , magnetic cloud , solar cycle , atmospheric sciences , earth's magnetic field , solar wind , storm , solar cycle 24 , meteorology , magnetic field , quantum mechanics
We study the interplanetary causes of intense geomagnetic storms ( Dst < −100 nT) that occurred during solar cycle 23 (1997–2005). It was found that the most common interplanetary structures leading to the development of an intense storm were: magnetic clouds, sheath fields, sheath fields followed by a magnetic cloud and corotating interaction regions leading high speed streams. However, the relative importance of each of those driving structures was found to vary with the solar cycle phase. We divide the cycle in three phases (rising, maximum and declining) and explain the differences. We also discuss about the geoeffectiveness of each of the four main interplanetary driving structures.