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1

Harnessing celestial batteries

Pulkkinen, Antti, Viljanen, Ari, Pirjola, Risto

Journal:

American Journal of Physics

Year:

2009

Language:

english

File:

PDF, 440 KB

english, 2009

2

Statistics on geomagnetically-induced currents in the Finnish 400kV power system based on recordings of geomagnetic variations.

VILJANEN, Ari, PIRJOLA, Risto

Journal:

Journal of geomagnetism and geoelectricity

Year:

1989

Language:

english

File:

PDF, 876 KB

english, 1989

3

No evidence of cross-reactivity of human antibodies to a 33-mer peptide of the alpha-gliadin component of gluten with Bordetella pertussis pertactin

Qiushui He, Matti K. Viljanen, Ari E. Hinkkanen, Heikki Arvilommi, Jussi Mertsola, Markku Viander

Journal:

Year:

2005

Language:

english

File:

PDF, 283 KB

english, 2005

4

Series expansions for the electric and magnetic fields produced by a line or sheet current source above a layered Earth

Pirjola, Risto, Viljanen, Ari, Boteler, David

Journal:

Year:

1999

Language:

english

File:

PDF, 661 KB

english, 1999

5

Solar wind driven empirical forecast models of the time derivative of the ground magnetic field

Wintoft, Peter, Wik, Magnus, Viljanen, Ari

Journal:

Journal of Space Weather and Space Climate

Year:

2015

Language:

english

File:

PDF, 802 KB

english, 2015

6

Forecasting auroras from regional and global magnetic field measurements

Kauristie, Kirsti, Myllys, Minna, Partamies, Noora, Viljanen, Ari, Peitso, Pyry, Juusola, Liisa, Ahmadzai, Shabana, Singh, Vikramjit, Keil, Ralf, Martinez, Unai, Luginin, Alexej, Glover, Alexi, Navarr

Journal:

Geoscientific Instrumentation Methods and Data Systems

Year:

2016

Language:

english

File:

PDF, 3.01 MB

english, 2016

7

Modelling of space weather effects on pipelines

Antti Pulkkinen, Risto Pirjola, David Boteler, Ari Viljanen, Igor Yegorov

Journal:

Journal of Applied Geophysics

Year:

2001

Language:

english

File:

PDF, 442 KB

english, 2001

8

Electric field at the seafloor due to a two-dimensional ionospheric current

Risto J. Pirjola, Ari T. Viljanen, David H. Boteler

Journal:

Geophysical Journal International

Year:

2000

Language:

english

File:

PDF, 482 KB

english, 2000

9

Studies of space weather effects on the finnish natural gas pipeline and on the finnish high-voltage power system

Risto Pirjola, Antti Pulkkinen, Ari Viljanen

Journal:

Advances in Space Research

Year:

2003

Language:

english

File:

PDF, 1.02 MB

english, 2003

10

Prediction of geomagnetically induced currents in power transmission systems

Risto Pirjola, David Boteler, Ari Viljanen, Olaf Amm

Journal:

Advances in Space Research

Year:

2000

Language:

english

File:

PDF, 917 KB

english, 2000

11

Recordings and occurrence of geomagnetically induced currents in the Finnish natural gas pipeline network

Antti Pulkkinen, Ari Viljanen, Kari Pajunpää, Risto Pirjola

Journal:

Journal of Applied Geophysics

Year:

2001

Language:

english

File:

PDF, 309 KB

english, 2001

12

Application of conformal mapping to 2-D conductivity structures with non-uniform primary sources

Pekka Janhunen, Ari Viljanen

Journal:

Geophysical Journal International

Year:

1991

Language:

english

File:

PDF, 375 KB

english, 1991

13

On induction effects at EISCAT and IMAGE magnetometer stations

Ari Viljanen, Kirsti Kauristie, Kari Pajunpää

Journal:

Geophysical Journal International

Year:

1995

Language:

english

File:

PDF, 1.06 MB

english, 1995

14

A review of progress in modelling of induced geoelectric and geomagnetic fields with special regard to induced currents

Alan W.P. Thomson, Allan J. McKay, Ari Viljanen

Journal:

Acta Geophysica

Year:

2009

Language:

english

File:

PDF, 1.11 MB

english, 2009

15

Ionospheric equivalent current distributions determined with the method of spherical elementary current systems

Antti Pulkkinen, Olaf Amm, Ari Viljanen

Journal:

Journal of Geophysical Research: Space Physics

Year:

2003

Language:

english

File:

PDF, 738 KB

english, 2003

16

Space weather risk

Risto Pirjola, Kirsti Kauristie, Hanna Lappalainen, Ari Viljanen, Antti Pulkkinen

Journal:

Space Weather The International Journal of Research and Applications

Year:

2005

Language:

english

File:

PDF, 1.60 MB

english, 2005

17

Geomagnetic storm of 29–31 October 2003: Geomagnetically induced currents and their relation to problems in the Swedish high-voltage power transmission system

Antti Pulkkinen, Sture Lindahl, Ari Viljanen, Risto Pirjola

Journal:

Space Weather The International Journal of Research and Applications

Year:

2005

Language:

english

File:

PDF, 137 KB

english, 2005

18

On the possibility of performing studies on the geoelectric field and ionospheric currents using induction in power systems

Ari Viljanen, Risto Pirjola

Journal:

Journal of Atmospheric and Terrestrial Physics

Year:

1994

Language:

english

File:

PDF, 783 KB

english, 1994

19

On Geomagnetically-Induced Currents in the Finnish 400 kV Power System by an Auroral Electroject Current

Pirjola, Risto, Viljanen, Ari

Journal:

IEEE Power Engineering Review

Year:

1989

Language:

english

File:

PDF, 557 KB

english, 1989

20

Observations of highly correlated near-simultaneous magnetic field perturbations at contraposed ground stations

Jackel, Brian J., Eglitis, Paul, Donovan, Eric F., Viljanen, Ari T., Wallis, Don D., Cogger, Leroy L., Opgenoorth, Hermann J.

Journal:

Journal of Geophysical Research

Year:

2001

Language:

english

File:

PDF, 2.03 MB

english, 2001

21

Modeling geomagnetically induced currents during different ionospheric situations

Viljanen, Ari, Amm, Olaf, Pirjola, Risto

Journal:

Journal of Geophysical Research

Year:

1999

Language:

english

File:

PDF, 1.16 MB

english, 1999

22

Estimation of geomagnetically induced current levels from different input data

Pulkkinen, Antti, Viljanen, Ari, Pirjola, Risto

Journal:

Space Weather The International Journal of Research and Applications

Year:

2006

Language:

english

File:

PDF, 2.48 MB

english, 2006

23

Limitations of the modeling of geomagnetically induced currents in the South African power network

Ngwira, Chigomezyo M., McKinnell, Lee-Anne, Cilliers, Pierre J., Viljanen, Ari, Pirjola, Risto

Journal:

Space Weather The International Journal of Research and Applications

Year:

2009

Language:

english

File:

PDF, 173 KB

english, 2009

24

European Project to Improve Models of Geomagnetically Induced Currents

Journal:

Space Weather The International Journal of Research and Applications

Year:

2011

Language:

english

File:

PDF, 74 KB

english, 2011

25

Effects of neutral point reactors and series capacitors on geomagnetically induced currents in a high-voltage electric power transmission system

Arajärvi, Esko, Pirjola, Risto, Viljanen, Ari

Journal:

Space Weather The International Journal of Research and Applications

Year:

2011

Language:

english

File:

PDF, 589 KB

english, 2011

26

The Relation Between Geomagnetic Variations and Their Time Derivatives and Implications for Estimation of Induction Risks

Journal:

Geophysical Research Letters

Year:

1997

Language:

english

File:

PDF, 323 KB

english, 1997

27

Study explores space weather risk to natural gas pipeline in Finland

Pirjola, Risto, Pulkkinen, Antti, Viljanen, Ari, Nevanlinna, Heikki, Pajunpää, Kari

Journal:

Eos Transactions American Geophysical Union

Year:

1999

Language:

english

File:

PDF, 287 KB

english, 1999

28

Magnetotelluric source effect due to 3D ionospheric current systems using the complex image method for 1D conductivity structures

Ari Viljanen,Risto Pirjola,Olaf Amm

Journal:

Earth Planets and Space

Year:

1999

Language:

english

File:

PDF, 593 KB

english, 1999

29

Separation of the geomagnetic variation field on the ground into external and internal parts using the spherical elementary current system method

Antti Pulkkinen,Olaf Amm,Ari Viljanen

Journal:

Earth Planets and Space

Year:

2003

Language:

english

File:

PDF, 929 KB

english, 2003

30

One-dimensional spherical elementary current systems and their use for determining ionospheric currents from satellite measurements

Liisa Juusola,Olaf Amm,Ari Viljanen

Journal:

Earth Planets and Space

Year:

2006

Language:

english

File:

PDF, 517 KB

english, 2006

31

Determination of ground conductivity and system parameters for optimal modeling of geomagnetically induced current flow in technological systems

Antti Pulkkinen,Risto Pirjola,Ari Viljanen

Journal:

Earth Planets and Space

Year:

2007

Language:

english

File:

PDF, 290 KB

english, 2007

32

One-dimensional upward continuation of the ground magnetic field disturbance using spherical elementary current systems

Heikki Vanhamäki,Olaf Amm,Ari Viljanen

Journal:

Earth Planets and Space

Year:

2003

Language:

english

File:

PDF, 770 KB

english, 2003

33

High-latitude magnetic fields and their time derivatives: interhemispheric similarities

Viljanen, Ari, Tanskanen, Eija

Journal:

Earth Planets and Space

Year:

2013

Language:

english

File:

PDF, 504 KB

english, 2013

34

Deriving the geomagnetically induced electric field at the Earth’s surface from the time derivative of the vertical magnetic field

Vanhamäki, Heikki, Viljanen, Ari, Pirjola, Risto, Amm, Olaf

Journal:

Earth Planets and Space

Year:

2013

Language:

english

File:

PDF, 384 KB

english, 2013

35

Regional-scale high-latitude extreme geoelectric fields pertaining to geomagnetically induced currents

Pulkkinen, Antti, Bernabeu, Emanuel, Eichner, Jan, Viljanen, Ari, Ngwira, Chigomezyo

Journal:

Earth Planets and Space

Year:

2015

Language:

english

File:

PDF, 707 KB

english, 2015

36

Cardiovascular functional disorder in primary fibromyalgia. A noninvasive study in 17 young men

Visuri, Tuomo, Lindholm, Harri, Lindqvist, Ari, Dahlström, Seppo, Viljanen, Antti

Journal:

Arthritis & Rheumatism

Year:

1992

Language:

english

File:

PDF, 492 KB

english, 1992

37

Intercalibration of an acoustic technique, two optical ones, and a simple seston dry mass method for freshwater zooplankton sampling

Rahkola-Sorsa, Minna, Voutilainen, Ari, Viljanen, Markku

Journal:

Limnology and Oceanography Methods

Year:

2014

Language:

english

File:

PDF, 844 KB

english, 2014

38

Characteristics of extreme geoelectric fields and their possible causes: Localized peak enhancements

Ngwira, Chigomezyo M., Pulkkinen, Antti A., Bernabeu, Emanuel, Eichner, Jan, Viljanen, Ari, Crowley, Geoff

Journal:

Geophysical Research Letters

Year:

2015

Language:

english

File:

PDF, 1.23 MB

english, 2015

39

Enteroatmospheric fistulae in open abdomen: Management and outcome – Single center experience

Rasilainen, Suvi Kaarina, Viljanen, Milla, Mentula, Panu Juhani, Leppäniemi, Ari Kalevi

Journal:

International Journal of Surgery Open

Year:

2016

Language:

english

File:

PDF, 286 KB

english, 2016

40

Influence of spatial variations of the geoelectric field on geomagnetically induced currents

Viljanen, Ari, Pirjola, Risto

Journal:

Journal of Space Weather and Space Climate

Year:

2017

Language:

english

File:

PDF, 682 KB

english, 2017

41

Regional estimation of geomagnetically induced currents based on the local magnetic or electric field

Viljanen, Ari, Wintoft, Peter, Wik, Magnus

Journal:

Journal of Space Weather and Space Climate

Year:

2015

Language:

english

File:

PDF, 871 KB

english, 2015

42

Geomagnetically induced currents in Norway: the northernmost high-voltage power grid in the world

Myllys, Minna, Viljanen, Ari, Rui, Øyvind August, Ohnstad, Trond Magne

Journal:

Journal of Space Weather and Space Climate

Year:

2014

Language:

english

File:

PDF, 1.50 MB

english, 2014

43

Extreme value analysis of the time derivative of the horizontal magnetic field and computed electric field

Wintoft, Peter, Viljanen, Ari, Wik, Magnus

Journal:

Annales Geophysicae

Year:

2016

Language:

english

File:

PDF, 512 KB

english, 2016

44

ELECTROMAGNETIC SOURCE EQUIVALENCE AND EXTENSION OF THE COMPLEX IMAGE METHOD FOR GEOPHYSICAL APPLICATIONS

Pulkkinen, Antti, Viljanen, Ari, Pirjola, Risto, Häkkinen, Lasse

Journal:

Progress In Electromagnetics Research B

Year:

2009

Language:

english

File:

PDF, 472 KB

english, 2009

45

Defect‐Driven Enhancement of Electrochemical Oxygen Evolution on Co‐Fe‐Al Ternary Hydroxides

Sun, Yixuan, Xia, Yuanyuan, Kuai, Long, Sun, Hongxia, Cao, Wei, Huttula, Marko, Honkanen, Ari-Pekka, Viljanen, Mira, Huotari, Simo, Geng, Baoyou

Journal:

Year:

2019

Language:

english

File:

PDF, 1.52 MB

english, 2019

46

Defect‐Driven Enhancement of Electrochemical Oxygen Evolution on Co‐Fe‐Al Ternary Hydroxides

Sun, Yixuan, Xia, Yuanyuan, Kuai, Long, Sun, Hongxia, Cao, Wei, Huttula, Marko, Honkanen, Ari-Pekka, Viljanen, Mira, Huotari, Simo, Geng, Baoyou

Journal:

Year:

2019

File:

PDF, 1.52 MB

2019