Ilkka Virtanen

Ilkka Virtanen


University Lecturer


My research concentrates on studies of the ionosphere, the very top of the Earth's atmosphere where also Aurora borealis, the northern lights, take place at the high latitudes. My main expertise are ionospheric radar observation techniques and the related data analysis. We conduct sophisticated ionospheric observations with, among other instruments, the EISCAT incoherent scatter radars located in the northern Fenno-Scandinavia.

Selected publications

  • Oyama, S.; Shinbori, A.; Ogawa, Y.; Kellinsalmi, M.; Raita, T.; Aikio, A.; Vanhamäki, H.; Shiokawa, K.; Virtanen, I.; Cai, L.; Workayehu, A.B.; Pedersen, M.; Kauristie, K.; Tsuda, T.T.; Kozelov, B.; Demekhov, A.; Yahnin, A.; Tsuchiya, F.; Kumamoto, A.; Kasahara, Y.; Matsuoka, A.; Shoji, M.; Teramoto, M.; Lester, M. (2020) An Ephemeral Red Arc Appeared at 68° MLat at a Pseudo Breakup During Geomagnetically Quiet Conditions. - Journal of geophysical research : space physics 125 (10), e2020JA028468 . [Original] [Self-archived]
  • Takahashi, Toru; Virtanen, Ilkka I.; Hosokawa, Keisuke; Ogawa, Yasunobu; Aikio, Anita; Miyaoka, Hiroshi; Kero, Antti (2019) Polarization Electric Field Inside Auroral Patches: Simultaneous Experiment of EISCAT Radars and KAIRA. - Journal of geophysical research : space physics 124 (5), 3543-3557 . [Original]
  • Cai, L.; Oyama, S.; Aikio, A.; Vanhamäki, H.; Virtanen, I (2019) Fabry-Perot Interferometer Observations of Thermospheric Horizontal Winds During Magnetospheric Substorms. - Journal of geophysical research : space physics 124 (5), 3709-3728 . [Original]
  • Marchaudon, A.; Blelly, P.-L.; Grandin, M.; Aikio, A.; Kozlovsky, A.; Virtanen, I. (2018) IPIM Modeling of the Ionospheric F2 Layer Depletion at High Latitudes During a High-Speed Stream Event. - Journal of Geophysical Research: Space Physics 123 (8), 7051-7066 . [Original] [Self-archived]
  • Virtanen, Ilkka I.; Gustavsson, Björn; Aikio, Anita; Kero, Antti; Asamura, Kazushi; Ogawa, Yasunobu (2018) Electron energy spectrum and auroral power estimation from incoherent scatter radar measurements. - Journal of Geophysical Research: Space Physics 123 (8), 6865-6887 . [Original] [Self-archived]
  • Aikio, A. T.; Vanhamäki, H.; Workayehu, A. B.; Virtanen, I. I.; Kauristie, K.; Juusola, L.; Buchert, S.; Knudsen, D. (2018) Swarm Satellite and EISCAT Radar Observations of a Plasma Flow Channel in the Auroral Oval Near Magnetic Midnight. - Journal of Geophysical Research: Space Physics 123 (6), 5140-5158 . [Original] [Self-archived]
  • Norberg, Johannes; Virtanen, Ilkka I.; Roininen, Lassi; Vierinen, Juha; Orispää, Mikko; Kauristie, Kirsti; Lehtinen, Markku S. (2016) Bayesian statistical ionospheric tomography improved by incorporating ionosonde measurements. - Atmospheric Measurement Techniques 9 (4), 1859-1869 .
  • McKay-Bukowski, Derek; Vierinen, Juha; Virtanen, Ilkka I.; Fallows, R.; Postila, Markku; Ulich, Thomas; Wucknitz, O.; Brentjens, M.; Ebbendorf, N.; Enell, Carl-Fredrik; Gerbers, M.; Grit, T.; Gruppen, P.; Kero, Antti; Iinatti, Toivo; Lehtinen, Markku; Meulman, H.; Norden, M.; Orispää, Mikko; Raita, Tero; de Reijer, J. P.; Roininen, Lassi; Schoenmakers, A.; Stuurwold, K. and Turunen, Esa (2015) KAIRA: The Kilpisjärvi Atmospheric Imaging Receiver Array - System overview and first results. - IEEE Transactions on Geoscience and Remote Sensing 53 (3), 1440-1451
  • Virtanen, Ilkka I. (2015) Background Suppression and Strong Phase Codes in Incoherent Scatter Lag Profile Inversion. - IEEE Geoscience and Remote Sensing Letters 12 (4), 841-845 . [Original]
  • Roininen, Lassi; Lehtinen, Markku S.; Piiroinen, Petteri; Virtanen, Ilkka I. (2014) Perfect radar pulse compression via unimodular fourier multipliers. - Inverse problems and imaging 8 (3), 831-844 .
  • Virtanen, I. I.; McKay-Bukowski, D.; Vierinen, J.; Aikio, A.; Fallows, R.; Roininen, L. (2014) Plasma parameter estimation from multistatic, multibeam incoherent scatter data. - Journal of Geophysical Research: Space Physics 119 (12), 10528-10543
  • Fallows, R. A.; Coles, W. A.; McKay-Bukowski, D.; Vierinen, J.; Virtanen, I. I.; Postila, M.; Ulich, Th.; Enell, C.-F.; Kero, A.; Iinatti, T.; Lehtinen, M.; Orispää, M.; Raita, T.; Roininen, L.;Turunen, E.; Brentjens, M.; Ebbendorf, N.; Gerbers, M.; Grit, T.; Gruppen, P.; Meulman, H.; Norden, M.; de Reijer, J.-P.; Schoenmakers, A.; Stuurwold, K. (2014) Broadband meter-wavelength observations of ionospheric scintillation. - Journal of Geophysical Research: Space Physics 119 (12), 10544–10560 .
  • Virtanen, Ilkka I.; Lind, Frank D.; Roininen, Lassi; Erickson,Philip J.; Rideout, William C.; Orispää, Mikko; Vierinen, Juha; Lehtinen, Markku S. (2013) Polyphase-coded incoherent scatter measurements at Millstone Hill. - Radio Science 48, 519-526 .
  • Virtanen Ilkka, Vierinen Juha-Pekka and Lehtinen Markku (2009) Phase-coded pulse aperiodic transmitter coding. - Annales Geophysicae 27, 2799-2811 . [Original]
  • Virtanen, Ilkka I.; Lehtinen, Markku S.; Nygren, Tuomo; Orispää, Mikko & Vierinen, Juha (2008) Lag profile inversion method for EISCAT data analysis. - Annales Geophysicae 26 (3), 571-581
  • Virtanen, Ilkka I.; Lehtinen, Markku S. & Vierinen, Juha-Pekka (2008) Towards multi-purpose IS radar experiments. - Annales Geophysicae 26 (8), 2281-2289
  • Lehtinen, Markku; Virtanen, Ilkka & Vierinen, Juha-Pekka (2008) Fast comparison of IS radar code sequences for lag profile inversion. - Annales Geophysicae 26 (8), 2291-2301
  • Vierinen, Juha; Lehtinen, Markku S. & Virtanen, Ilkka (2008) Amplitude domain analysis of strong range and Doppler spread radar echos. - Annales Geophysicae 26 (8), 2419-2426
  • Kero, Antti; Vierinen, Juha; Enell, Carl-Fredrik; Virtanen, Ilkka &Turunen, Esa (2008) New incoherent scatter diagnostic methods for the heated D-region ionosphere. - Annales Geophysicae 26 (8), 2273-2279
  • Vierinen, Jukka-Pekka; Lehtinen, Markku; Orispää, Mikko & Virtanen, Ilkka (2008) Transmission code optimization method for incoherent scatter radar. - Anneales Geophysicae 26, 2923-2927
  • Kero, Antti; Enell, Carl-Fredrik; Kavanagh, A. J.; Vierinen, J.; Virtanen, Ilkka & Turunen, Esa (2008) Could negative ion production explain the polar mesosphere winter echo (PMWE) modulation in active HF heating experiments. - Geophysical Research Letters 35, L23102 1-4 . doi:10.1029/2008GL035798, 2008
  • Voiculescu, M.; Virtanen, Ilkka & Nygrén, Tuomo (2006) F-region trough: seasonal morphology and relation to interplanetary magnetic field. - Annales Geophysicae 24 (1), 173-185