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- Publications
- Influence
Unusual activity of the Sun during recent decades compared to the previous 11,000 years
- S. Solanki, I. Usoskin, B. Kromer, M. Schüssler, J. Beer
- Medicine
- Nature
- 28 October 2004
Direct observations of sunspot numbers are available for the past four centuries, but longer time series are required, for example, for the identification of a possible solar influence on climate and… Expand
The AD775 cosmic event revisited: the Sun is to blame
- I. Usoskin, B. Kromer, +5 authors L. Wacker
- Physics
- 27 February 2013
Aims. Miyake et al. (2012, Nature, 486, 240, henceforth M12) recently reported, based on 14 C data, an extreme cosmic event in about AD775. Using a simple model, M12 claimed that the event was too… Expand
Active longitudes in sunspot activity: Century scale persistence
- S. Berdyugina, S. Berdyugina, I. Usoskin
- Physics
- 1 July 2003
A novel analysis of sunspot group data for the past 120 years reveals that sunspots in both northern and southern hemispheres are formed preferably in two persistent active longitudes separated by… Expand
Heliospheric modulation of cosmic rays: Monthly reconstruction for 1951–2004
- I. Usoskin, K. Alanko-Huotari, G. Kovaltsov, K. Mursula
- Physics
- 1 December 2005
[1] The differential energy spectrum of galactic cosmic rays in the vicinity of the Earth can be parameterized by the so-called force field model which has only one parameter, the modulation… Expand
Grand minima and maxima of solar activity: new observational constraints
- I. Usoskin, S. Solanki, G. Kovaltsov
- Physics
- 4 June 2007
Aims. Using a reconstruction of sunspot numbers stretching over multiple millennia, we analyze the statistics of the occurrence of grand minima and maxima and set new observational constraints on… Expand
Evolution of the solar irradiance during the Holocene
- L. Vieira, S. Solanki, N. Krivova, I. Usoskin
- Physics
- 25 March 2011
Context. Long-term records of solar radiative output are vital for understanding solar variability and past climate change. Measurements of solar irradiance are available for only the last three… Expand
Properties of Ground Level Enhancement Events and the Associated Solar Eruptions During Solar Cycle 23
- N. Gopalswamy, H. Xie, S. Yashiro, S. Akiyama, P. Mäkelä, I. Usoskin
- Physics
- 3 May 2012
Solar cycle 23 witnessed the most complete set of observations of coronal mass ejections (CMEs) associated with the Ground Level Enhancement (GLE) events. We present an overview of the observed… Expand
Solar modulation parameter for cosmic rays since 1936 reconstructed from ground-based neutron monitors and ionization chambers
- I. Usoskin, G. Bazilevskaya, G. Kovaltsov
- Physics, Geology
- 1 February 2011
[1] The differential energy spectrum of galactic cosmic rays near Earth is often parameterized by the force field model with the only time-dependent parameter, the modulation potential ϕ. Here we… Expand
A new model of cosmogenic production of radiocarbon 14C in the atmosphere
- G. Kovaltsov, A. Mishev, I. Usoskin
- Geology, Physics
- 29 June 2012
Abstract We present the results of full new calculation of radiocarbon 14C production in the Earth atmosphere, using a numerical Monte-Carlo model. We provide, for the first time, a tabulated 14C… Expand
THE FIRST GROUND LEVEL ENHANCEMENT EVENT OF SOLAR CYCLE 24: DIRECT OBSERVATION OF SHOCK FORMATION AND PARTICLE RELEASE HEIGHTS
- N. Gopalswamy, H. Xie, S. Akiyama, S. Yashiro, I. Usoskin, J. Davila
- Physics
- 6 February 2013
We report on the 2012 May 17 ground level enhancement (GLE) event, which is the first of its kind in solar cycle 24. This is the first GLE event to be fully observed close to the surface by the Solar… Expand
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