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Ilpo Virtanen
Ilpo Virtanen
Principal lecturer, Oulu University of Applied Sciences
Verified email at oamk.fi
Title
Cited by
Cited by
Year
Reconstructing solar magnetic fields from historical observations-I. Renormalized Ca K spectroheliograms and pseudo-magnetograms
AA Pevtsov, I Virtanen, K Mursula, A Tlatov, L Bertello
Astronomy & Astrophysics 585, A40, 2016
612016
Photospheric and coronal magnetic fields in six magnetographs-I. Consistent evolution of the bashful ballerina
I Virtanen, K Mursula
Astronomy & Astrophysics 591, A78, 2016
412016
Asymmetry of solar polar fields and the southward shift of HCS observed by Ulysses
II Virtanen, K Mursula
Journal of Geophysical Research: Space Physics 115 (A9), 2010
352010
Tilt of sunspot bipoles in solar cycles 15 to 24
K Tlatova, A Tlatov, A Pevtsov, K Mursula, V Vasil’eva, E Heikkinen, ...
Solar Physics 293, 1-12, 2018
342018
Reconstructing solar magnetic fields from historical observations-II. Testing the surface flux transport model
IOI Virtanen, II Virtanen, AA Pevtsov, A Yeates, K Mursula
Astronomy & Astrophysics 604, A8, 2017
302017
Reconstructing solar magnetic fields from historical observations-II. Testing the surface flux transport model
IOI Virtanen, II Virtanen, AA Pevtsov, A Yeates, K Mursula
Astronomy & Astrophysics 604, A8, 2017
302017
Automated identification of coronal holes from synoptic EUV maps
A Hamada, T Asikainen, I Virtanen, K Mursula
Solar Physics 293, 1-26, 2018
292018
Bihelical spectrum of solar magnetic helicity and its evolution
NK Singh, MJ Käpylä, A Brandenburg, PJ Käpylä, A Lagg, I Virtanen
The Astrophysical Journal 863 (2), 182, 2018
252018
North–South asymmetric solar cycle evolution: signatures in the photosphere and consequences in the corona
II Virtanen, K Mursula
The Astrophysical Journal 781 (2), 99, 2014
242014
Reconstructing solar magnetic fields from historical observations-V. Sunspot magnetic field measurements at Mount Wilson observatory
AA Pevtsov, KA Tlatova, AA Pevtsov, E Heikkinen, I Virtanen, NV Karachik, ...
Astronomy & Astrophysics 628, A103, 2019
222019
The last dance of the bashful ballerina?
K Mursula, I Virtanen
Astronomy & Astrophysics 525, L12, 2011
182011
Comparing coronal and heliospheric magnetic fields over several solar cycles
JS Koskela, II Virtanen, K Mursula
The Astrophysical Journal 835 (1), 63, 2017
152017
On a limitation of Zeeman polarimetry and imperfect instrumentation in representing solar magnetic fields with weaker polarization signal
AA Pevtsov, Y Liu, I Virtanen, L Bertello, K Mursula, KD Leka, ...
Journal of space weather and space climate 11, 14, 2021
122021
Effect of additional magnetograph observations from different Lagrangian points in Sun‐Earth system on predicted properties of quasi‐steady solar wind at 1 AU
AA Pevtsov, G Petrie, P MacNeice, II Virtanen
Space Weather 18 (7), e2020SW002448, 2020
122020
Abrupt shrinking of solar corona in the late 1990s
II Virtanen, JS Koskela, K Mursula
The Astrophysical Journal Letters 889 (2), L28, 2020
122020
Structure and evolution of the photospheric magnetic field in 2010–2017: comparison of SOLIS/VSM vector field and BLOS potential field
II Virtanen, AA Pevtsov, K Mursula
Astronomy & Astrophysics 624, A73, 2019
122019
Reconstructing solar magnetic fields from historical observations-IV. Testing the reconstruction method
IOI Virtanen, II Virtanen, AA Pevtsov, L Bertello, A Yeates, K Mursula
Astronomy & Astrophysics 627, A11, 2019
112019
Reconstructing solar magnetic fields from historical observations-III. Activity in one hemisphere is sufficient to cause polar field reversals in both hemispheres
IOI Virtanen, II Virtanen, AA Pevtsov, K Mursula
Astronomy & Astrophysics 616, A134, 2018
112018
Photospheric and coronal magnetic fields in six magnetographs-III. Photospheric and coronal magnetic fields in 1974–2017
I Virtanen, K Mursula
Astronomy & Astrophysics 626, A67, 2019
102019
Structure of the photospheric magnetic field during sector crossings of the heliospheric magnetic field
T Getachew, I Virtanen, K Mursula
Solar Physics 292, 1-19, 2017
102017
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