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Ann. Geophys., 25, 1037-1047, 2007
www.ann-geophys.net/25/1037/2007/
© European Geosciences Union 2007
Control of high latitude geomagnetic fluctuations by interplanetary parameters: the role of suprathermal ions
N. Yagova1, V. Pilipenko1, J. Watermann2, and K. Yumoto3
1Institute of the Physics of the Earth, Moscow, Russia
2Danish Meteorological Institute, Copenhagen, Denmark
3Kyushu University, Fukuoka, Japan
Abstract. We examine the statistical relationships between the
interplanetary parameters and spectral power of the geomagnetic
fluctuations in the 1–4 mHz frequency band at high latitude
stations in two hemispheres. For that, we use a cross-correlative
analysis of different combinations of parameters to identify a
factor contributing most to the ULF power and to choose (whenever
possible) the cross-related keynote controlling parameters. Along
with the well-known dependencies of the high latitude pulsation
power on the solar wind velocity and variations of the SW
dynamical pressure and an additional factor – the flux of solar
suprathermal ions with energies about several keV, has been
established.
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