32 Result(s)

Article

Monitoring of Spatiotemporal Variations in the Production Rates of Cosmogenic Radionuclides in Chondrites of Different Orbits Falling to Earth

The paper presents data obtained on the production rates of cosmogenic radionuclides of different half-life in 42 chondrites that fell in 1959–2016. A quantitative approach is developed for using cosmogenic ra...

G. K. Ustinova, V. A. Alexeev in Geochemistry International (2020)

Article

Study of the Pallasite Radiation History by Track Analysis

This work was performed within the OLYMPIA experiment on the study of tracks of heavy and superheavy cosmic ray nuclei in olivine crystals from Marjalahti and Eagle Station pallasites. Depth distributions of t...

V. A. Alexeev, A. V. Bagulya, A. E. Volkov… in Bulletin of the Lebedev Physics Institute (2019)

Article

Variations of Cosmogenic Radionuclide Production Rates in Chondrites of Known Orbits

The results of multiyear investigations of cosmogenic radionuclide production rates along the orbits of 42 chondrites that fell to the Earth between 1959 and 2016 are presented. They constitute a long set of h...

G. K. Ustinova, V. A. Alexeev in Doklady Physics (2019)

Article

Cosmogenic Radionuclides In Meteorites and Solar Modulation of Galactic Cosmic Rays In the Internal Heliosphere

Cosmogenic radionuclides with half-life periods T_1/2 ranging from several days to a million years, produced in the nuclear reactions of galactic cosmic rays (GCR) with meteoritic matter, provide valuable informat...

V. A. Alexeev, M. Laubenstein, P. P. Povinec, G. K. Ustinova in Solar System Research (2019)

Article

A model of possible variations of the galactic cosmic ray intensity over the recent billion years

Based on the analysis of published data on exposure ages of iron meteorites determined with the ⁴⁰K/K method (T _K) and ages calculated using short-lived cosmogenic radionuclides (w...

V. A. Alexeev in Solar System Research (2017)

Article

Convective structures in the Lofoten Basin based on satellite and Argo data

We discuss the possibility of detecting deep convection in the Lofoten Basin of the Norwegian Sea based on the eddy structures revealed from the satellite data. Satellite altimetry, SAR imagery, and MODIS sate...

V. A. Alexeev, V. V. Ivanov, I. A. Repina… in Izvestiya, Atmospheric and Oceanic Physics (2016)

Article

Long-term galactic cosmic ray variations over the last billion years based on the cosmic-ray exposure ages of iron meteorites

The distribution of the cosmic-ray exposure ages (T) of iron meteorites was analyzed to establish the possible variations in the intensity of the galactic cosmic ray (GCR) over the last billion years. The anal...

V. A. Alexeev in Geochemistry International (2016)

Article

On time variations of the intensity of galactic cosmic rays for the recent billion years from the data on exposure ages of iron meteorites

To ascertain probable variations of the intensity of galactic cosmic rays (GCR) for the recent billion years, the distribution of exposure ages T of iron meteorites has been analyzed. We considered all ~80 values...

V. A. Alexeev in Solar System Research (2016)

Article

Cosmogenic radionuclides in Chelyabinsk and Kosice chondrites and features of solar cycles 23 and 24

Based on the example of the measured and calculated contents of cosmogenic radionuclides in freshly fallen Chelyabinsk and Kosice chondrites, an indirect approach to studying variations in galactic cosmic rays...

V. A. Alexeev, M. Laubenstein, P. P. Povinec… in Bulletin of the Russian Academy of Science… (2015)

Article

Ground penetrating radar investigation of the supposed fall site of a fragment of the Chelabinsk meteorite in Lake Chebarkul’

The bottom of Lake Chebarkul’ was investigated by ground penetrating radar at the fall site of a large fragment of the Chelyabinsk meteorite. Linear profiles and 3D reconstructions revealed an anomalous depres...

V. V. Kopeikin, V. D. Kuznetsov, P. A. Morozov, A. V. Popov… in Geochemistry International (2013)

Article

Analytical results for the material of the Chelyabinsk meteorite

This paper presents the results of the mineralogical, petrographic, elemental, and isotopic analysis of the Chelyabinsk meteorite and their geochemical interpretation. It was shown that the meteorite can be as...

E. M. Galimov, V. P. Kolotov, M. A. Nazarov, Yu. A. Kostitsyn… in Geochemistry International (2013)

Article

Monitoring temporal and spatial variations in galactic cosmic rays (GCRs) in the inner heliosphere from data on cosmogenic radionuclides in freshly-fallen meteorites

Meteorite data on monitoring the variations in GCR gradients at 2–4 AU from the Sun over the period 1957–2010 demonstrate the effect of the inversion of solar magnetic fields (SMFs) during the solar maximum pe...

V. A. Alexeev, V. D. Gorin, G. K. Ustinova in Bulletin of the Russian Academy of Science… (2013)

Article

The character of the solar magnetic field restructuring and its effect on the modulation depth of galactic cosmic rays in the heliosphere

V. A. Alexeev, G. K. Ustinova in Doklady Physics (2013)

Article

Origin of fossil meteorites from Ordovician limestone in Sweden

Based on the analysis of data in [1, 2] on the concentrations of noble gases and the cosmic ray exposure age (CREA) of chromite grains in fossil meteorites, it was demonstrated in [3] that the distributions of...

V. A. Alexeev in Geochemistry International (2012)

Article

Integrated study of the thermoluminescence, noble gases, tracks, and radionuclides in the fresh-fallen Ash Creek L6 and Tamdakht H5 chondrites

Thermoluminescence, noble gases, and the tracks of iron-group elements and cosmogenic radionuclides of various half-lives were examined in the fresh-fallen Ash Creek (L6) and Tamdakht (H5) chondrites. The expe...

V. A. Alexeev, V. D. Gorin, A. I. Ivliev, L. L. Kashkarov… in Geochemistry International (2012)

Article

Revisiting the radiation history of fossil meteorites from Sweden (Rebuttal to a comment by Wieler et al. On the paper by V.A. Alexeev “Radiation History of Fossil Meteorites from Sweden,” published in solar system research, 44, 311–319)

From the analysis of the data acquired for the chromite grains recovered from fossil meteorites from Sweden (Heck et al., 2004, 2008), the dependence of the exposure age of meteorites on a mass of the examined...

V. A. Alexeev in Solar System Research (2011)

Article

Radiation history of fossil meteorites from Sweden

We present the results of the analysis of the data obtained by Heck et al. (2004; 2008) regarding the contents of ⁴He and ^20,21,22Ne and the exposure age of chromite grains recovered from fossil meteorites (L-cho...

V. A. Alexeev in Solar System Research (2010)

Article

Recently fallen Bukhara (CV3) and Kilabo (LL6) chondrites: A parallel study of luminescence, tracks, and cosmogenic radionuclides

Thermoluminescence, tracks of VH nuclei, and cosmogenic radionuclides with various half-lives were studied of the recently fallen Bukhara CV3 and Kilabo LL6 chondrites. The obtained experimental information and t...

V. A. Alexeev, V. D. Gorin, A. I. Ivliev, L. L. Kashkarov… in Geochemistry International (2008)

Article

On the asteroid origin of some LL6 chondrites

V. A. Alexeev, V. D. Gorin, L. L. Kashkarov, G. K. Ustinova in Doklady Physics (2008)