• PL 64 (Gustaf Hällströmin katu 2)

    00014

    Finland

1991 …2023
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Publications 1991 2019

  • 47 Article
  • 1 Conference contribution
  • 1 Conference article
  • 1 Doctoral Thesis
2019

Ajan sumea luonne

Hackman, T., Jul 2019, In : Arkhimedes. 2019, 2, p. 27-28 2 p.

Research output: Contribution to journalArticleProfessional

Differences in the solar cycle variability of simple and complex active regions during 1996-2018

Nikbakhsh, S., Tanskanen, E. I., Käpylä, M. J. & Hackman, T., 4 Sep 2019, In : Astronomy & Astrophysics. 629, 9 p., A45.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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Long-term spot monitoring of the young solar analogue V889 Herculis

Willamo, T., Hackman, T., Lehtinen, J. J., Käpylä, M. J., Ilyin, I., Henry, G. W., Jetsu, L., Kochukhov, O. & Piskunov, N., 15 Feb 2019, In : Astronomy & Astrophysics. 622, p. 10 10 p., A170.

Research output: Contribution to journalArticleScientificpeer-review

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Spot evolution on LQ Hya from 2006-2017: temperature maps based on SOFIN and FIES data

Cole-Kodikara, E. M., Käpylä, M. J., Lehtinen, J. J., Hackman, T., Ilyin, I., Piskunov, N. & Kochukhov, O., 13 Sep 2019, In : Astronomy & Astrophysics. 629, 9 p., A120.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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Starspot activity of HD199178 Doppler images from 1994-2017

Hackman, T., Ilyin, I., Lehtinen, J. J., Kochukhov, O., Käpylä, M. J., Piskunov, N. & Willamo, T., 16 May 2019, In : Astronomy & Astrophysics. 625, 10 p., A79.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
2018

Solar superstorm of AD 774 recorded subannually by Arctic tree rings

Uusitalo, J., Arppe, L., Hackman, T., Helama, S., Kovaltsov, G., Mielikäinen, K., Mäkinen, H., Nöjd, P., Palonen, V., Usoskin, I. & Oinonen, M., 28 Aug 2018, In : Nature Communications. 9, 1, 8 p., 3495.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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2017

Contemporaneous Imaging Comparisons of the Spotted Giant sigma Geminorum Using Interferometric, Spectroscopic, and Photometric Data

Roettenbacher, R. M., Monnier, J. D., Korhonen, H., Harmon, R. O., Baron, F., Hackman, T., Henry, G. W., Schaefer, G. H., Strassmeier, K. G., Weber, M. & ten Brummelaar, T. A., 10 Nov 2017, In : Astrophysical Journal. 849, 2, 16 p., 120.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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Tapio Markkanen 1942-2017: muistokirjoitus

Hackman, L. T., Oct 2017, In : Arkhimedes. 2017, 3, p. 27 1 p.

Research output: Contribution to journalArticleProfessional

Time-series analysis of long-term photometry of BM Canum Venaticorum

Siltala, L., Jetsu, L., Hackman, T., Henry, G. W., Immonen, L., Kajatkari, P., Lankinen, J., Lehtinen, J., Monira, S., Nikbakhsh, S., Viitanen, A., Viuho, J. & Willamo, T., May 2017, In : Astronomische Nachrichten. 338, 4, p. 453-463 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
2016

Activity trends in young solar-type stars

Lehtinen, J., Jetsu, L., Hackman, T., Kajatkari, P. & Henry, G. W., Apr 2016, In : Astronomy & Astrophysics. 588, 24 p., A38.

Research output: Contribution to journalArticleScientificpeer-review

Open Access

Magnetic fields of young solar twins

Rosen, L., Kochukhov, O., Hackman, T. & Lehtinen, J., Sep 2016, In : Astronomy & Astrophysics. 593, 24 p., A35.

Research output: Contribution to journalArticleScientificpeer-review

Zeeman-Doppler imaging of active young solar-type stars

Hackman, T., Lehtinen, J., Rosen, L., Kochukhov, O. & Käpylä, M. J., Mar 2016, In : Astronomy & Astrophysics. 587, 7 p., A28.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2015

Doppler images and the underlying dynamo The case of AF Leporis

Järvinen, S. P., Arlt, R., Hackman, T., Marsden, S. C., Küker, M., Ilyin, I. V., Berdyugina, S. V., Strassmeier, K. G. & Waite, I. A., Feb 2015, In : Astronomy & Astrophysics. 574, 18 p., A25.

Research output: Contribution to journalArticleScientificpeer-review

Open Access

Doppler imaging of LQ Hydrae for 1998-2002

Cole, E. M., Hackman, T., Käpylä, M. J., Ilyin, I., Kochukhov, O. & Piskunov, N., Sep 2015, In : Astronomy & Astrophysics. 581, 9 p., A69.

Research output: Contribution to journalArticleScientificpeer-review

Multiperiodicity, modulations, and flip-flops in variable star light curves III. Carrier fit analysis of LQ Hydrae photometry for 1982-2014

Olspert, N., Kapyla, M. J., Pelt, J., Cole, E. M., Hackman, T., Lehtinen, J. & Henry, G. W., May 2015, In : Astronomy & Astrophysics. 577, 13 p., A120.

Research output: Contribution to journalArticleScientificpeer-review

Periodicity in some light curves of the solar analogue V352 Canis Majoris

Kajatkari, P., Jetsu, L., Cole, E., Hackman, T., Henry, G. W., Joutsiniemi, S. -L., Lehtinen, J., Mäkelä, V., Porceddu, S., Ryynanen, K. & Solea, V., May 2015, In : Astronomy & Astrophysics. 577, 5 p., A84.

Research output: Contribution to journalArticleScientificpeer-review

Stellar activity as noise in exoplanet detection - I. Methods and application to solar-like stars and activity cycles

Korhonen, H., Andersen, J. M., Piskunov, N., Hackman, T., Juncher, D., Järvinen, S. P. & Jorgensen, U. G., 21 Apr 2015, In : Monthly Notices of the Royal Astronomical Society. 448, 4, p. 3038-3052 15 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access

Study of FK Comae Berenices VII. Correlating photospheric and chromospheric activity

Vida, K., Korhonen, H., Ilyin, I. V., Olah, K., Andersen, M. I. & Hackman, T., Aug 2015, In : Astronomy & Astrophysics. 580, 14 p., A64.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2014

Doppler images of DI Piscium during 2004-2006

Lindborg, M., Hackman, T., Mantere, M. J., Korhonen, H., Ilyin, I., Kochukhov, O. & Piskunov, N., Feb 2014, In : Astronomy & Astrophysics. 562, 2, p. A139 7 p., A139.

Research output: Contribution to journalArticleScientificpeer-review

Spot activity of the RS Canum Venaticorum star sigma Geminorum

Kajatkari, P., Hackman, T., Jetsu, L., Henry, G. W. & Lehtinen, J. J., Feb 2014, In : Astronomy & Astrophysics. 562, February, p. A107 10 p., A107.

Research output: Contribution to journalArticleScientificpeer-review

2013

Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity I. Spot evolution in HD 11753 on short and long time scales

Korhonen, H., Gonzalez, J. F., Briquet, M., Soriano, M. F., Hubrig, S., Savanov, I., Hackman, T., Ilyin, I. V., Eulaers, E. & Pessemier, W., May 2013, In : Astronomy & Astrophysics. 553, 16 p., A27.

Research output: Contribution to journalArticleScientificpeer-review

Flip-flops of FK Comae Berenices

Hackman, T., Pelt, J., Mantere, M. J., Jetsu, L., Korhonen, H., Granzer, T., Kajatkari, P., Lehtinen, J. J. & Strassmeier, K. G., May 2013, In : Astronomy & Astrophysics. 553, 13 p., A40.

Research output: Contribution to journalArticleScientificpeer-review

Magnetic field topology of the RS CVn star II Pegasi

Kochukhov, O., Mantere, M. J., Hackman, T. & Ilyin, I., Feb 2013, In : Astronomy & Astrophysics. 550, p. A84 19 p.

Research output: Contribution to journalArticleScientificpeer-review

Multiperiodicity, modulations and flip-flops in variable star light curves II: Analysis of II Pegasus photometry during 1979-2010

Lindborg, M., Mantere, M. J., Olspert, N., Pelt, J., Hackman, T., Henry, G. W., Jetsu, L. & Strassmeier, K. G., Nov 2013, In : Astronomy & Astrophysics. 559, p. A.97 10 p., 97.

Research output: Contribution to journalArticleScientificpeer-review

2012

Doppler images of II Pegasi for 2004-2010

Hackman, T., Mantere, M. J., Lindborg, M., Ilyin, I., Kochukhov, O., Piskunov, N. & Tuominen, I., 2012, In : Astronomy & Astrophysics. 538, p. A126 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Gregor@night: The future high-resolution stellar spectrograph for the GREGOR solar telescope

Strassmeier, K. G., Ilyin, I. V., Woche, M., Granzer, T., Weber, M., Weingrill, J., Bauer, S. -M., Popow, E., Denker, C., Schmidt, W., von der Luehe, O., Berdyugina, S., Collados, M., Koubsky, P., Hackman, T. & Mantere, M. J., 1 Nov 2012, In : Astronomische Nachrichten. 333, 9, p. 901-910 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Spot activity of LQ Hydra from photometry between 1988 and 2011

Lehtinen, J., Jetsu, L., Hackman, T., Kajatkari, P. & Henry, G. W., 2012, In : Astronomy & Astrophysics. Supplement Series. 542, p. - 8 p.

Research output: Contribution to journalArticleScientificpeer-review

2011

Dependence of the large-scale vortex instability on latitude, stratification and domain size

J. Mantere, M., J. Käpylä, P. & Hackman, T., 2011, In : Astronomische Nachrichten. 332, 9/10, p. 876 – 882 7 p.

Research output: Contribution to journalArticleScientificpeer-review

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Doppler images of the RS CVn binary II Pegasi during the years 1994-2002

Lindborg, M., Korpi, M. J., Hackman, T., Tuominen, I., Ilyin, I. & Piskunov, N., 2011, In : Astronomy & Astrophysics. 526, p. Article number A44 7 p.

Research output: Contribution to journalArticleScientificpeer-review

Spot activity of II Peg

Hackman, T., Mantere, M., Jetsu, L., Ilyin, I., Kajatkari, P. J., Kochukhov, O., Lehtinen, J. J., Lindborg, M., Piskunov, N. & Tuominen, I., 12 Dec 2011, In : Astronomische Nachrichten. 332, 9, p. 859 – 865 7 p.

Research output: Contribution to journalArticleScientificpeer-review

STARSPOTS DUE TO LARGE-SCALE VORTICES IN ROTATING TURBULENT CONVECTION

Mantere, M. J., Hackman, T. & Kapyla, P. J., 2011, In : Astrophysical Journal. 742, 1, p. 34 8 p.

Research output: Contribution to journalArticleScientificpeer-review

The continuous period search method and its application to the young solar analogue HD 116956

Lehtinen, J., Jetsu, L., Hackman, T., Kajatkari, P. & Henry, G. W., Mar 2011, In : Astronomy & Astrophysics. 527, p. A136 14 p.

Research output: Contribution to journalArticleScientificpeer-review

2010

Dynamical evolution of titanium, strontium, and yttrium spots on the surface of the HgMn star HD11753

Briquet, M., Korhonen, H., Gonzalez, J. F., Hubrig, S. & Hackman, T., 2010, In : Astronomy & Astrophysics. 511, p. A71 6 p.

Research output: Contribution to journalArticleScientificpeer-review

Ellipsoidal primary of the RS CVn binary ζ Andromedae: Investigation using high-resolution spectroscopy and optical interferometry

Korhonen, H., Wittkowski, M., Kővári, Z., Granzer, T., Hackman, T. & Strassmeier, K. G., 2010, In : Astronomy & Astrophysics. 515, p. A14

Research output: Contribution to journalArticleScientificpeer-review

Kirja-arvostelu: Tähtitieteen perusteet

Hackman, T., 2010, In : Arkhimedes. 2010, 5, p. 26 1 p.

Research output: Contribution to journalArticleProfessional

Surface temperature maps for II Peg during 1999-2002

Lindborg, M., Korpi, M. J., Tuominen, I., Hackman, T., Ilyin, I. & Piskunov, N., 2010, Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium. Kosovichev, A. G., Andrei, A. H. & Rozelot, J-P. (eds.). Cambridge University Press, Vol. 5. p. 213-218 6 p. (Proceedings of the International Astronomical Union; no. S264).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

2009

First measurement of the magnetic field on FK Com and its relation to the contemporaneous star-spot locations

Korhonen, H., Hubrig, S., Berdyugina, S. V., Granzer, T., Hackman, T., Schöller, M., Strassmeier, K. G. & Weber, M., 2009, In : Monthly Notices of the Royal Astronomical Society. 395, p. 282–289 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Spot evolution and active longitudes on FK Com: more than a decade of detailed surface mapping

Korhonen, H., Berdyugina, S. V., Ilyin, I. V., Strassmeier, K. G. & Hackman, T., 2009, In : Revista mexicana de astronomía y astrofísica. Serie de conferencias. 36, Supplementary CD, p. CD323-CD327 5 p.

Research output: Contribution to journalConference articleScientificpeer-review

The Application of FORS1 Spectropolarimetry to the Investigation of Cool Solar-like Stars

Korhonen, H., Hubrig, S., Kövarii, Z., Weber, M., Strassmeier, K., Hackman, T. & Wittkowski, M., 2009, In : Messenger. 138, p. 15-18 4 p.

Research output: Contribution to journalArticleScientific

2008

The in-flight performance of the X-ray Solar Monitor (XS0M) on-board SMART-1

Alha, L., Huovelin, J., Hackman, T., Andersson, H., Howe, C. J., Esko, E. & Väänänen, M., 2008, In : Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. 596, 3, p. 317-326 10 p.

Research output: Contribution to journalArticleScientificpeer-review

2007

Study of FK Comae Berenices: V. Spot evolution and detection of surface differential rotation

Korhonen, H., Berdyugina, S. V., Hackman, T., Ilyin, I. V., Strassmeier, K. G. & Tuominen, I., 2007, In : Astronomy & Astrophysics. 476, 2, p. 881-891 11 p.

Research output: Contribution to journalArticleScientificpeer-review

2004

Doppler Imaging and Photometric Time Series Analysis of Stellar Spot Activity

Hackman, T., 2004, Helsinki: Yliopistopaino. 51 p.

Research output: ThesisDoctoral Thesis

2002

Time series analysis of V511 Lyrae photometry

Lyytinen, J., Johansson, P., Jetsu, L., Esko, E., Hackman, T., Hall, D. S., Henry, G. W., Kontinen, S., Könönen, P., Maisala, S., Palviainen, A. & Ryynänen, K., 2002, In : Astronomy & Astrophysics. 2002, 383, p. 197-201 5 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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2001

Surface imaging of HD 199178 (V1794 Cygni)

Hackman, T., Jetsu, L. & Tuominen, I., 2001, In : Astronomy & Astrophysics. 374, p. 171-181 11 p.

Research output: Contribution to journalArticleScientificpeer-review

2000

Study of FK Comae Berenices II. Spot evolution from 1994 to 1997

Korhonen, H., Berdyugina, S. V., Hackman, T., Strassmeier, K. G. & Tuominen, I., 2000, In : Astronomy & Astrophysics. 360, p. 1067-1076 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Time series analysis of V815 Herculis photometry between 1984 and 1998

Jetsu, L., Hackman, T., Hall, D. S., Henry, G. W., Kokko, M. & You, J., 2000, In : Astronomy & Astrophysics. 362, p. 223-235 13 p.

Research output: Contribution to journalArticleScientificpeer-review

1999

Photometry of V 1794 Cygni between 1975 and 1995

Jetsu, L., Tuominen, I., Bopp, B. W., Ezhkova, O. V., Grankin, K. N., Hackman, T., Heckert, P. A., Ibragimov, M. A., Kondratiev, V. B., Mel'nikov, S. Y., Oja, T., Nations, H. L. & Shevchenko, V. S., 1999, In : Astronomy & Astrophysics. 139, p. 513-523 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Study of FK Comae Berenices I. Surface images for 1994 and 1995

Korhonen, H., Berdyugina, S. V., Hackman, T., Duemmler, R., Ilyin, I. V. & Tuominen, I., 1999, In : Astronomy & Astrophysics. 346, p. 101-110 10 p.

Research output: Contribution to journalArticleScientificpeer-review

1996

The gas flows of SU Aurigae

Petrov, P. P., Gullbring, E., Ilyin, I., Gahm, G. F., Tuominen, I., Hackman, T. & Loden, K., 1996, In : Astronomy & Astrophysics. 314, p. 821-834 14 p.

Research output: Contribution to journalArticleScientificpeer-review

1991

DOPPLER IMAGING OF HIGH-LATITUDE SPOT ACTIVITY ON HD-26337

STRASSMEIER, K. G., RICE, J. B., WEHLAU, W. H., VOGT, S. S., HATZES, A. P., TUOMINEN, I., PISKUNOV, N. E., HACKMAN, T. & POUTANEN, M., 1991, In : Astronomy & Astrophysics. 247, p. 130-147 18 p.

Research output: Contribution to journalArticleScientificpeer-review