Interaction of high-speed and transient fluxes of solar wind at the maximum of solar cycle 24

The interaction of the interplanetary coronal mass ejection (ICME) and the high-speed solar wind flux (HSSWF) associated with the coronal hole (CH) is considered. By the examples of two events at the maximum of solar cycle 24 from June 4 to June 16 and from June 30 to July 10, 2012 it is shown that the temperature-dependent parameters of the SW ionic composition appear closer to the values in the HSSWF than in the ICME due to mixing of fluxes in the corona when the ICME source is near the CH boundary.     

Description of alpha-clustering of 8Be nucleus states in high-precision theoretical approach

Scrupulous theoretical study of ⁸Be nucleus states, both clustered and non-clustered, is performed over a wide range of excitation energies. The quantities that characterize the degree of the alpha-clustering of these states, i.e., spectroscopic factors, cluster form factors, and alpha-decay widths, are computed in the framework of the developed accurate ab initio approach. Other basic properties of the ⁸Be spectrum, including the binding and excitation energies and the mean values of the isospin, are calculated simultaneously. In the majority of instances, the results of the computation turn out to be in good agreement with the spectroscopic data. A number of predictions are made, and corresponding verification experiments are proposed. Prospects of the developed approach for nuclear spectroscopy are demonstrated.     

Geomagnetic Storms and Forbush-Decreases Related to Single and Complex Transient Structures of Solar Wind

Bulletin of the Lebedev Physics Institute - The geoeffectiveness of single and complex transient structures of the solar wind (SW), formed by coronal mass ejections (CMEs) and associated Forbush...     

Features of the Alpha Decay of Highly Excited States of the 10Be Nucleus

JETP Letters - The spectrum of the 10Be nucleus in a wide range of excitation energies has been calculated within the no-core shell model. An extrapolation procedure has been used to refine the...     

Comparative XPS Study of Al2O3 and CeO2Sulfation in Reactions with SO2, SO2 + O2, SO2 + H2O,and SO2 + O2 + H2O

The interactions of Al₂O₃, CeO₂, Pt/Al₂O₃, and Pt/CeO₂ films with SO₂, SO₂ + H₂O, SO₂ + O₂, and SO₂ + O₂ + H₂O in the temperature range 300–673 K at the partial pressures of SO₂, O₂, and H₂O equal to 1.5 × 10², 1.5 × 10², and 3 × 10² Pa, respectively, were studied using X-ray photoelectron spectroscopy. The formation of surface sulfite at T 473 K (the S 2p _3/2 binding energy (E _b) is 167.5 eV) and surface sulfate at T 573 K (E _b = 169.2 eV) was observed in the reactions of Al₂O₃ and CeO₂ with SO₂. The formation of sulfates on the surface of CeO₂ occurred much more effectively than in the case of Al₂O₃, and it was accompanied by the reduction of Ce(IV) to Ce(III). The formation of aluminum and cerium sulfates and sulfites on model Pt/Al₂O₃ and Pt/CeO₂ catalysts occurred simultaneously with the formation of surface platinum sulfides (E _b of S 2p _3/2 is 162.2 eV). The effects of oxygen and water vapor on the nature and yield of sulfur-containing products were studied.     

Ab Initio Description of Clustering Phenomena in Spectra of Light Nuclei

JETP Letters - An approach has been presented to take into account clustering properties of nuclei by the introduction of cluster components in the basis used in microscopic ab initio calculations...     

Prediction of geoeffective solar wind streams near earth according to solar observational data

A semi-empirical model for predicting solar wind (SW) streams is developed based on satellite images of the Sun and corona using a hierarchical approach. The model allows simultaneous calculation of the parameters of all three SW components, i.e., slow SW, high-speed streams from coronal holes, and interplanetary coronal mass ejections, as well as the detection of their possible interaction in the heliosphere.     

Asymptotic Characteristics of Cluster Channels within an Ab Initio Approach

JETP Letters - An approach has been developed to calculate the characteristics of cluster channels—the asymptotic normalization coefficients of bound states and the decay widths of narrow...