36 citations · 36 across the 4 of their papers we have counts for
4 papers
Photospheric index of geomagnetic activity
Ismo Tähtinen, Timo Qvick, Timo Asikainen +1
Geomagnetic indices quantify the disturbances of the Earth's magnetic field. They form an important space weather and space climate record that tracks solar-terrestrial effects on…
Ultra-fast simulations of the solar dipole and open flux
Ismo Tähtinen, Timo Asikainen, Kalevi Mursula
Context. Solar dipole captures important information about the large-scale solar magnetic field. The evolution of the solar magnetic field including the solar dipole can be simulat…
Prediction of even and odd sunspot cycles
Timo Asikainen, Jani Mantere
Here we study the prediction of even and odd numbered sunspot cycles separately, thereby taking into account the Hale cyclicity of solar magnetism. We first show that the temporal…
A new method to estimate annual solar wind parameters and contributions of different solar wind structures to geomagnetic activity
Lauri Holappa, Kalevi Mursula, Timo Asikainen
In this paper, we study two sets of local geomagnetic indices from 26 stations using the principal component (PC) and the independent component (IC) analysis methods. We demonstrat…