Timo Asikainen

PhD, Docent

Senior Research Fellow
Space climate and space weather

Biography

My research concentrates on Space Climate, in other words, undestanding the long-term variations of solar activity and its effects in near-Earth space, atmosphere and climate system. This research field is highly multidisciplidary and is at the cross-section of space and climate science. One important focus point is to understand the various ways the the Sun can affect the climate system not only by solar radiation but by the continuous stream of magnetised plasma flowing out from the Sun, the solar wind.
The latest research topic is to develop methods to predict solar activity and its effects in near-Earth space and climate system over long time scales. This type of research involves dealing with huge amounts of data from various sources (satellites, ground-based data, model data and climate re-analyses). This often requires application of statistical big data and machine learning methods.
 

Personal website

Research interests

  • space climate
  • solar effects on climate
  • machine learning and big data applications to space climate science
  • long-term solar activity and its effects in near-Earth space
  • space weather

Databases

Scientific merits

Research groups

  • Team leader, ReSoLVE Centre of Excellence

Selected publications

  • Asikainen, Timo; Ruopsa, Miro (2019) New Homogeneous Composite of Energetic Electron Fluxes From POES Satellites: 1. Correction for Background Noise and Orbital Drift. - Journal of geophysical research : space physics 124 (2), 1203-1221 . [Original]
  • Hamada, Amr; Asikainen, Timo; Virtanen, Ilpo; Mursula, Kalevi (2018) Automated Identification of Coronal Holes from Synoptic EUV Maps. - Solar physics 293 (4), 71 . [Original] [Self-archived]
  • Maliniemi, Ville; Asikainen, Timo; Mursula, Kalevi (2018) Decadal variability in the Northern Hemisphere winter circulation : effects of different solar and terrestrial drivers. - Journal of atmospheric and solar-terrestrial physics 179, 40-54 . [Original] [Self-archived]
  • Asikainen, T. (2017) Calibrated and corrected POES/MEPED energetic particle observations. The ESPAS e-infrastructure: Access to data from near-Earth space. Belehaki, Anna; Hapgood, Mike; Watermann, Juergen. - Ei sarjaa/No series. -. 57-69. [Original]
  • Asikainen, T.; Ruopsa, M. (2016) Solar wind drivers of energetic electron precipitation. - Journal of Geophysical Research: Space Physics 121 (3), 2209-2225 . [Original]
  • Maliniemi, Ville; Asikainen, Timo; Mursula, Kalevi (2016) Effect of geomagnetic activity on the northern annular mode : QBO dependence and the Holton-Tan relationship. - Journal of Geophysical Research: Atmospheres 121 (17), 10043-10055 . [Original]
  • Roy, I.; Asikainen, T.; Maliniemi, V.; Mursula, K (2016) Comparing the influence of sunspot activity and geomagnetic activity on winter surface climate. - Journal of atmospheric and solar-terrestrial physics 149, 167-179 . [Original]
  • Maliniemi, Ville; Asikainen, Timo; Mursula, Kalevi (2014) Spatial distribution of Northern Hemisphere winter temperatures during different phases of the solar cycle. - Journal of Geophysical Research: Atmospheres 119 (16), 9752-9764
  • Asikainen, Timo; Mursula, Kalevi (2014) Long-term evolution of corrected NOAA/MEPED energetic proton fluxes and their relation to geomagnetic indices. - Journal of atmospheric and solar-terrestrial physics 113, 29-38
  • Holappa, L.; Mursula, K.; Asikainen, T.; Richardson, I.G. (2014) Annual fractions of high-speed streams from principal component analysis of local geomagnetic activity. - Journal of Geophysical Research: Space Physics 119 (6), 4544-4555
  • Holappa, L.; Mursula, K.; Asikainen, T. (2014) A new method to estimate annual solar wind parameters and contributions of different solar wind structures to geomagnetic activity. - Journal of Geophysical Research: Space Physics 119 (12), 9407-9418
  • Asikainen, T.; Mursula, K. (2013) Correcting the NOAA/MEPED energetic electron fluxes for detector efficiency and proton contamination. - Journal of Geophysical Research: Space Physics 118, 6500-6510
  • Maliniemi, Ville; Asikainen, Timo; Mursula, Kalevi; Seppala, Annika (2013) QBO-dependent relation between electron precipitation and wintertime surface temperature. - Journal of Geophysical Research: Atmospheres 118 (12), 6302-6310
  • Asikainen, T.; Mursula, K.; Maliniemi, V. (2012) Correction of detector noise and recalibration of NOAA/MEPED energetic proton fluxes. - Journal of Geophysical Research 117 (A9), 1-16, A09204
  • Asikainen Timo and Mursula Kalevi (2011) Recalibration of the long-term NOAA/MEPED energetic proton measurements. - Journal of atmospheric and solar-terrestrial physics 73 (2-3), 335-347
  • Asikainen Timo, Maliniemi Ville, Mursula Kalevi (2010) Modeling the contributions of ring, tail and magnetopause currents to the corrected Dst index. - Journal of Geophysical Research 115, A12203 (16 pp)

Thesis supervisions

  • A. Salminen (PhD, 2021 expected):¬†Effects of energetic particle precipitation on atmospheric dynamics

  • A. Hamada (PhD, 2019 expected): Long-term evolution of solar coronal holes

  • L. Holappa (PhD, 2017):¬†Spatio-temporal evolution of geomagnetic activity and its relation to solar wind

  • V. Maliniemi (PhD, 2016): Observations of solar wind related climate effects in the northern hemisphere winter

  • In addition 10 M.Sc. and B.Sc. theses supervised.