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pro vyhledávání: '"Kovaltsov, G"'
Autor:
Usoskin, I. G., Solanki, S. K., Krivova, N., Hofer, B., Kovaltsov, G. A., Wacker, L., Brehm, N., Kromer, B.
The 11-year solar cycle is the dominant pattern of solar activity reflecting the oscillatory dynamo mechanism in the Sun. Solar cycles were directly observed since 1700, while indirect proxies suggest their existence over a much longer period of time
Externí odkaz:
http://arxiv.org/abs/2103.15112
Publikováno v:
J. Geophys. Res. Atmos., 125, e2020JD033147 (2020)
A new model of cosmogenic tritium ($^3$H) production in the atmosphere is presented. The model belongs to the CRAC (Cosmic-Ray Atmospheric Cascade) family and is named as CRAC:3H. It is based on a full Monte-Carlo simulation of the cosmic-ray induced
Externí odkaz:
http://arxiv.org/abs/2009.07700
Akademický článek
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Aims. Lunar soil and rocks are not protected by a magnetic field or an atmosphere and are continuously irradiated by energetic particles that can produce cosmogenic radioisotopes directly inside rocks at different depths depending on the particle's e
Externí odkaz:
http://arxiv.org/abs/1807.10153
Autor:
Wu, Chi Ju, Usoskin, I. G., Krivova, N., Kovaltsov, G. A., Baroni, M., Bard, E., Solanki, S. K.
Publikováno v:
A&A 615, A93 (2018)
Solar activity in the past millennia can only be reconstructed from cosmogenic radionuclide records in terrestrial archives. However, because of the diversity of the proxy archives, it is difficult to build a homogeneous reconstruction. Here we provi
Externí odkaz:
http://arxiv.org/abs/1804.01302
Akademický článek
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It has been recently claimed (Zolotova and Ponyavin, Solar Phys., 291, 2869, 2016, ZP16 henceforth) that a mid-latitude optical phenomenon, which took place over the city of Astrakhan in July 1670, according to Russian chronicles, was a strong aurora
Externí odkaz:
http://arxiv.org/abs/1612.00705
Publikováno v:
Mishev, A., I.G. Usoskin, G.A. Kovaltsov, Neutron monitor yield function: New improved computations, J. Geophys. Res., 118, 783-2788, 2013
A ground-based neutron monitor is a standard tool to measure cosmic ray variability near Earth, and it is crucially important to know its yield function for primary cosmic rays. Although there are several earlier theoretically calculated yield functi
Externí odkaz:
http://arxiv.org/abs/1612.01498
Autor:
Asvestari, E., Willamo, T., Gil, A., Usoskin, I. G., Kovaltsov, G. A., Mikhailov, V. V., Mayorov, A.
Nearly 70 Ground Level Enhancements (GLEs) of cosmic rays have been recorded by the worldwide neutron monitor network since the 1950s depicting a big variety of energy spectra of solar energetic particles (SEP). Here we studied a statistical relation
Externí odkaz:
http://arxiv.org/abs/1612.02446
The distribution of the sunspot group size (area) and its dependence on the level of solar activity is studied. It is shown that the fraction of small groups is not constant but decreases with the level of solar activity so that high solar activity i
Externí odkaz:
http://arxiv.org/abs/1609.00569