242 citations · 1.7k across the 39 of their papers we have counts for
Showing 2017 · physics.space-phShow all
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physics.space-ph2017★ 37 cited
Automated identification of coronal holes from synoptic EUV maps
Amr Hamada, Timo Asikainen, Ilpo Virtanen +1
Coronal holes (CH) are regions of open magnetic field lines in the solar corona and the source of fast solar wind. Understanding the evolution of coronal holes is critical for sola…
physics.space-ph2017
Principal component analysis of geomagnetic activity: New information on solar wind
Kalevi Mursula, Lauri Holappa
We use the principal component analysis (PCA) to study geomagnetic activity at annual resolution using a network of 26 magnetic stations in 1966-2015, and an extended network of 40…
physics.space-ph2017★ 11 cited
Centennial evolution of monthly solar wind speeds: Fastest monthly solar wind speeds from long-duration coronal holes
Renata Lukianova, Lauri Holappa, Kalevi Mursula
High speed solar wind streams (HSSs) are very efficient drivers of geomagnetic activity at high latitudes. In this paper we use a recently developed parameter of geomagnetic…