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Papers in Refereed Journals (22+2)

Virtanen, I.O.I., I.I. Virtanen, and K. Mursuka, Axial dipole moments of solar active regions in cycles 21-24, Astron. Astrophys., submitted, 2019.

Koskela, J., I. I. Virtanen and K. Mursula, Revisiting the coronal CSSS-model: Parameter range analysis and comparison with the PFSS model, Astron. Astrophys., submitted, 2019.

Ayalew Getachew, T., I.I. Virtanen and K. Mursula A new signal of the solar magnetic cycle: Opposite shifts of weak magnetic field distributions in the two hemispheres Geophys. res. lett. , in press 2019.

Pevtsov, A.A, K.A. Tlatova, A.A. Pevtsov, E. Heikkinen, I.I. Virtanen, N.V. Karachik, L. Bertello, A.G. Tlatov, R. Ulrich and K. Mursula, Reconstructing solar magnetic fields from historical observations. V. Sunspot magnetic field measurements at Mount Wilson Observatory Astron. Astrophys.in press, 2019.

Virtanen, I.O.I., I.I. Virtanen, A.A. Pevtsov, L. Bertello, A. Yeates, and K. Mursula, Reconstructing solar magnetic fields from historical observations. V. Testing the reconstruction method Astron. Astrophys., in press, 2019. in press, 2019.

Virtanen, I.I. and K. Mursula, Photospheric and coronal magnetic fields in six magnetographs. III. Photospheric and coronal magnetic fields in 1974-2017, Astron. Astrophys.A67, 626, 2019.

Virtanen, I. I, A.A. Pevtsov and K. Mursula, Structure and evolution of the photospheric magnetic field in 2010 - 2017: Comparison of SOLIS/VSM vector field and BLOS potential field, Astron, Astrophys.,624, A73, 2019.

Ayalew Getachew, T., I.I. Virtanen and K. Mursula, Asymmetric distribution of weak photospheric magnetic field values,  Astrophys. J., 874, 116, 2019.

Zieger, B.,  I.I. Virtanen, and K. Mursula, Spatial power spectrum of the photospheric, magnetic field during solar minimum, Astron. Astrophys, A51, 623, 2019.

Tlatova, K., A. Tlatov, A.A. Pevtsov, K. Mursula, V. Vasil'eva; E. Heikkinen, L. Bertello. A. Pevtsov, I.I. Virtanen and N. Karachick, Tilt of sunspot bipoles in solar cycles 15 to 23, Solar phys., 293: 118., 2018 

Singh, N.K. M. J. Käpylä, A. Brandenburg, P. J. Käpylä, A. Lagg and I.I. Virtanen,  Bihelical spectrum of solar magnetic helicity and its evolution, Astrophys. J., 863, 182, 2018

Koskela, J., I. I. Virtanen and K. Mursula, Southward shift of the coronal neutral line and the heliospheric current sheet: Evidence for radial evolution of hemispheric asymmetry, Astron. Astrophys., A105, 618, 2018.

Virtanen I.O.I., I.I. Virtanen, A.A. Pevtsov, and K. Mursula, Reconstructing solar magnetic fields from historical observations, III. Activity in one hemisphere is sufficient to maintain the magnetic cycle in both hemispheres, Astron. Astrophys., 616, A134, 2018.

Hamada, A., T. Asikainen, I.I., Virtanen and K. Mursula, Automated identification of coronal holes from synoptic EUV maps, Solar phys.293, 71, 2018.

Ayalew Getachew, T., I.I. Virtanen and K. Mursula, Structure of the photospheric magnetic field during sector crossings of the heliospheric magnetic field, Solar phys., 292, 174, 2017

Virtanen, I. I., and K. Mursula, Photospheric and coronal magnetic fields in six magnetographs: II. Relative scaling of field intensities Astron. Astrophys., 604, A7, 2017.

Virtanen, I.O.I., I.I. Virtanen, A.A. Pevtsov, A. Yeates, and K. Mursula Reconstructing solar magnetic fields from historical observations II. Testing the surface flux transport model Astron. Astrophys., 604, A8, 2017

Koskela, J., I. I. Virtanen and K. Mursula, Comparing coronal and heliospheric magnetic fields over several solar cycles, Astrophys. J.,  835, 63, 2017

Virtanen, I.I. and K. Mursula, Photospheric and coronal magnetic fields in six magnetographs: I. Consistent evolution of the bashful ballerina Astron. Astrophys.  591, A78, 2016

Pevtsov, A.A., I.I. Virtanen, K. Mursula, A. G. Tlatov, and L. Bertello (2016), Reconstructing solar magnetic fields from historical observations: I. Renormalized Ca K spectroheliograms and pseudo-magnetograms,  Astron. Astrophys. 585, A40, 2016.

Virtanen, I. I., and K. Mursula, North-south asymmetric solar cycle evolution: signatures in the photosphere and consequences in the corona, The Astrophysical Journal 781 99, 2014

K. Mursula and I.I Virtanen, The wide skirt of the bashful ballerina: Hemispheric asymmetry of the heliospheric magnetic field in the inner and outer heliosphere, J. Geophys. Res.,  117, A08104, 2012 

Mursula, K., and I.I. Virtanen, The last dance of the bashful ballerina?, Astronomy and Astrophysics, 525 , L12+, 2011

Virtanen, I. I., and K. Mursula, Asymmetry of solar polar fields and the southward shift of HCS observed by Ulysses, J. Geophys. Res., 115, A09110, 2010

 

 

Doctoral Thesis

Virtanen I.I. (2013),   Asymmetry of the heliospheric magnetic field

Other 

Virtanen, I. I., K. Mursula, P. Väisänen, M. Echim, H. Lamy, G. Consolini, R. Bruno, G. Pallocchia, E. Yordanova, P. Kovacs, C. Munteanu, E. Teodorescu, G. Voitcu, W. Macek, A. Wawrzaszek: Catalog of PSDs in the solar wind – solar max and min, FP7-SPACE-2012-1, collaborative project STORM deliverable 2.1final report, 2014.

Echim, M.,  A. Wawrzaszek, E. Teodorescu, P. Väisänen, C. Munteanu, E. Yordanova, W. Macek, I.I. Virtanen, K. Mursula, P. Kovacs, G. Voitcu, H. Lamy, R. Bruno, G. Pallochia, G. Consolini, Y. Narita, and Z. Vörös, Catalog of Probability Density Functions (PDFs) in the solar wind, FP7-SPACE-2012-1, collaborative project STORM deliverable final 2.2 report, 2014.

Echim, M.,  A. Wawrzaszek, E. Teodorescu, P. Väisänen, C. Munteanu, E. Yordanova, W. Macek, I.I. Virtanen, K. Mursula, P. Kovacs, G. Voitcu, H. Lamy, R. Bruno, G. Pallochia, G. Consolini, Y. Narita, and Z. Voeroes (2014) STORM Periodic Report, 01/01/2013 – 30/06/2014: Project Objectives, Work progress and achievements, Project management, 2014.

Qvick, T.,  L. Holappa, K. Mursula, I.I. Virtanen, P. Väisänen, M. Echim, C. Munteanu, P.  Kovacs, Catalog of PDFs and PSD for geomagnetic indices - solar max and min - FP7-SPACE-2012-1, collaborative project STORM Deliverable 4.1 final report, 2015.

M. Echim, Y. Voitenko, H. Lamy, E. Yordanova, M. Andre, H. Breuillard, W. Macek, A. Wawrzaszek, P. Kovacs, A. Koppan, G. Voitcu, C. Munteanu, E. Teodorescu, C. Negrea, R. Bruno, G. Consolini, M. F. Marcucci, G. Pallochia, F. Giannattasio, M. Laurenza, Y. Narita, and Z. Voeroes, N Dwivedi, I. Virtanen, K. Mursula, P. Vaisanen, T. Qvick, STORM Periodic Report, 01/07/2014 – 31/12/2015: Project Objectives, Work progress and achievements, Project management, 94 pages, Report for the European Community's Seventh Framework Program, 2016.

Steed, K., G. Lapenta, B. Vrsnak, T. Zic, G. Verbanac, J. Calogovic, M. Dumbovic, A. Veronig, M. Temmer, C. Mostl, T. Rollett, T. Rotter, T. Falkenberg, S. Vennerstrøm, K. Leer, M. Tatrallyay, Z. Nemeth, M. I. Verigin, T. Asikainen, K. Mursula, D. Berghmans, K. Kecskemety, P. Kiraly, I.I. Virtanen, L. Zhang and Y. Beniguel, Soteria project, Deliverable 4.6 final report, 137 pages, Report for the European Community's Seventh Framework Program, 2011.

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