Ilkka Virtanen

Ilkka Virtanen

FT

Yliopistonlehtori

Biografia

Tutkimukseni kohteena on ionosfääri, Maan ilmakehän aivan ylin osa, jossa revontulet syntyvät korkeilla leveyasteilla. Ydinosaamistani ovat ionosfäärin tutkamittausmenetelmät sekä niihin liittyvä data-analyysi. Havainnoimme ionosfääriä muiden mittalaitteiden ohella pohjoisen Fenno-Skandinavian alueella sijaitseville EISCAT epäkoherentin sironnan tutkilla.

Valikoidut julkaisut

  • 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