Department of Electronics and Nanoengineering

Space Weather

Space Weather group is part of the Department of Electronics and Nanoengineering, Aalto University. The group is located in the TUAS-building.

Solar wind driving of space weather

Prof. Tuija Pulkkinen (

The continuous, highly variable solar wind flows through the heliosphere and drives space weather in space environments of the Earth and other planets. The solar wind influence on the magnetosphere is not instantaneous; solar wind properties are altered at the bow shock and further modified in the magnetosheath between the shock and the magnetospheric boundary. The magnetosheath plasma and magnetic field determine the efficiency of mechanisms governing solar wind energy and plasma entry to the magneto-sphere: magnetic reconnection, Kelvin-Helmholtz instability, and kinetic Alfvén waves. Within hours, the coupling leads to magnetotail reconfigurations and over days, acceleration of relativistic electrons in the van Allen belts. 

Increasing evidence suggests that interplanetary magnetic field fluctuations enhance the solar wind–magnetosphere coupling efficiency: A significant portion of the largest magnetospheric disturbances are associated with turbulent sheath regions, fluctuating stream interaction regions drive radiation belt electron enhancements, and strong ULF waves are associated with strong ionospheric convection. We use space observations and numerical modeling methods to investigate how the solar wind and interplanetary magnetic field and their variability drive geomagnetic activity in the magnetotail, in the inner magnetosphere, and in the ionosphere.

Two Radiation Belt Storm Probes (RBSP) (, were launched on Aug 30, 2012 to the inner magnetosphere to monitor the ring current and radiation belts. The European four Cluster ( craft have been in orbit since 2000 and the NASA Five Themis( spacecraft since 2007 providing an unprecedented opportunity of frequent simultaneous measurements from the near-Earth solar wind, shocked magnetosheath plasma, and consequences in the magnetotail and inner magnetosphere. 

Local and global magnetohydrodynamic simulations are used to examine the plasma transport and dynamic processes in the magnetosphere. While the local models can address many details of the instability development, the global simulations address the large-scale dynamics of the entire system. The GUMICS global MHD simulation developed in Finland is one of 5 actively used simulations globally, and the only one in Europe. 

The increased dependence of modern society on space technology has generated a need for targeted space weather studies, which aim at predicting the space environment and estimating worst-case scenarios for technology development and asset protection purposes.

Research is carried out in collaboration with the University of Helsinki ( and the Finnish Meteorological Institute ( under the auspices of the Kumpula Space Centre (

Figure: Kilpua et al. 2009

Group members

Riku Järvinen

Research Fellow
Dept Electronics and Nanoeng

Latest publications

Oxygen Ion Escape from Venus is Modulated by Ultra-Low-Frequency Waves

Riku Järvinen, Markku Alho, Esa Kallio, Tuija Pulkkinen 2020 Geophysical Research Letters

Ultra-low frequency waves in the ion foreshock of Mercury: A global hybrid modeling study

Riku Järvinen, Markku Alho, Esa Kallio, Tuija Pulkkinen 2020 Monthly Notices of the Royal Astronomical Society

Hybrid modeling of cometary plasma environments. II

Markku Alho, Cyril Simon Wedlund, Hans Nilsson, Esa Kallio, Riku Järvinen, Tuija Pulkkinen 2019 Astronomy & Astrophysics

Planetary magnetic field control of ion escape from weakly magnetized planets

Hilary Egan, Riku Järvinen, Y. Ma, D. A. Brain 2019 Monthly Notices of the Royal Astronomical Society

Stellar Influence on Heavy Ion Escape from Unmagnetized Exoplanets

Hilary Egan, Riku Järvinen, David A. Brain 2019 Monthly Notices of the Royal Astronomical Society

Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF Bx Component During Southward IMF

Sanni Hoilijoki, Urs Ganse, David G. Sibeck, Paul A. Cassak, Lucile Turc, Markus Battarbee, Robert C. Fear, Xochitl Blanco-Cano, Andrew Dimmock, Emilia K.J. Kilpua, Riku Järvinen, Liisa Juusola, Yann Pfau-Kempf, Minna Palmroth 2019 Journal of geophysical research: Space physics

GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds

Antti Lakka, Tuija I. Pulkkinen, Andrew P. Dimmock, Emilia Kilpua, Matti Ala-Lahti, Ilja Honkonen, Minna Palmroth, Osku Raukunen 2019 Annales Geophysicae

Remote Sensing of a Bow Shock at Comet 67P: ICA and Hybrid Modelling

Markku Alho, Hans Nilsson, Esa Kallio, Cyril Simon Wedlund, Riku Järvinen, Tuija Pulkkinen 2018

Remote Sensing of a Bow Shock at Comet 67P: Theory, ICA Observations and Hybrid Modelling

Markku Alho, Riku Jarvinen, Hans Nilsson, Tuija Pulkkinen, Esa Kallio, Cyril Simon Wedlund 2018

Global hybrid simulations of the magnetosphere of Mercury

Riku Jarvinen, Markku Alho, Esa Kallio, Tuija I. Pulkkinen 2018
More information on our research in the Research database.
Research database

Professor Tuija Pulkkinen
Email: tuija.pulkkinen at
Tel.:  +358 50 5916 013

Postal address:
Department of Electronics and Nanoengineering
Aalto University School of Electrical Engineering
P.O. Box 15500, 00076 Aalto, Finland

Visiting address:
Maarintie 8, 02150 Espoo

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