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Effects of solar wind magnetosphere coupling recorded at different geomagnetic latitudes: Separation of directly‐driven and storage/release systems
Author(s) -
Finch I. D.,
Lockwood M. L.,
Rouillard A. P.
Publication year - 2008
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 - 10.1029/2008gl035399
Subject(s) - earth's magnetic field , solar wind , interplanetary magnetic field , ionospheric dynamo region , interplanetary spaceflight , magnetosphere , geophysics , latitude , geomagnetic storm , atmospheric sciences , geomagnetic latitude , space weather , physics , geology , magnetic field , geodesy , quantum mechanics
The effect on geomagnetic activity of solar wind speed, compared with that of the strength of the interplanetary magnetic field, differs with geomagnetic latitude. In this study we construct a new index based on monthly standard deviations in the H‐component of the geomagnetic field for all geomagnetic latitudes. We demonstrate that for this index the response at auroral regions correlates best with interplanetary coupling functions which include the solar wind speed while mid‐ and low‐latitude regions respond to variations in the interplanetary magnetic field strength. These results are used to isolate the responsible geomagnetic current systems.