Catalog of cosmic gamma-ray bursts from the KONUS experiment data

Data are presented on the temporal structure, fluxes, energy spectra and coordinates of the sources of gamma-ray bursts detected in the KONUS experiment on Venera 11 and Venera 12 space probes in the period September 1978 to May 1979. The statistical distributions of gamma bursts in duration, intensity, and peak power, as well as the distribution of the burst sources over the celestial sphere presented are based on the updated KONUS information obtained until February 1980.     

A Geoelectrical Model of the Southern Ladoga Region on the Basis of 3D Magnetotelluric Data Inversion

Izvestiya, Physics of the Solid Earth - Abstract—The paper presents results of magnetotelluric sounding performed in the South-Eastern Ladoga Region in 2018–2021 for the purpose of...     

Study of Geoelectrical Responses to Space Weather Anomalies: Auroral Latitudes,Yenisei-Khatanga Regional Trough

Izvestiya, Physics of the Solid Earth - Abstract—The paper presents the results of analysis of the geoelectric (telluric) field variability during the Earth’s magnetic field...     

Anthropogenic load on the estuarine area of the Northern Dvina River

The results of calculation and analysis of the inflow of dissolved chemical substances to the estuarine area of the Northern Dvina River are considered. Based on the long-term regime hydrochemical information of the State Service of Observation and Monitoring of the Natural Environmental State, the anthropogenic load of dissolved chemical substances on the estuarine area and on the estuarine coastal water is estimated per inflow volumes. The extent of the water environment pollution of the near-delta part of the Northern Dvina River and its delta is estimated. The distribution of pollutant inflow among arms and channels in delta is under consideration.     

Comparative Analysis of Arctic Sea Ice Area Derived from Satellite Microwave Radiometry Data (VASIA2 Algorithm) with Ice Charts of the Arctic and Antarctic Research Institute

Izvestiya, Atmospheric and Oceanic Physics - The Arctic Sea ice area, calculated by the VASIA2 algorithm using the SSMIS data during the most intensive melting of the ice cover in 2019, is compared...     

The κ-Cygnid Meteor Shower and Its Relationship with Near-Earth Asteroids

Astronomy Reports - This study is focused on the relationships between the κ-Cygnid meteor shower and different groups of asteroids crossing the Earth’s orbit (the so-called near-Earth...     

Impact of the desorption energy of atomic oxygen on the chemical evolution in star-forming regions

The impact of a recently measured values of the desorption energy of oxygen released from the surface of silicate dust particles on the results of numerical simulations is analyzed. The chemical evolution of the interstellar medium under conditions corresponding to those in a cold, dark cloud is considered, together with the collapse of a translucent cloud into a dark cloud. Astrochemical modeling methods are used to show that, overall, there were no substantial changes in the chemical evolution under the conditions for the selected models for these objects, but the formation of somemolecules is sensitive to the change from the traditionally adopted oxygen desorption energy (800 K) to the new value (1850 K). The characteristics of the formation of such molecules are analyzed.     

Geoelectric section of the Central Tien Shan: Sequential inversion of the magnetovariational and magnetotelluric data along the Naryn Line

The paper presents the results of 2D inversion of deep magnetotelluric (MT) and magnetovariational (MV) soundings along the Naryn Line. The method of partial (sequential) inversions is used. According to this method, at the first stage, magnetovariation responses are used for the localization of deep anomalies of electrical conductivity, and then the magnetotelluric sounding data are invoked to refine the structure of the host medium and the structural details in the upper part of the section. It is shown that this approach enables one to estimate the informativeness of separate components of the electromagnetic field, to reduce the distorting influence of the near-surface geoelectric inhomogeneities, and to increase the stability of the final solution of the inverse problem.     

The characteristics of the shear-wave attenuation field in the Altai lithosphere and their relationship to seismicity

The short-period S-wave attenuation field has been mapped for the lithosphere of the Altai and adjacent areas in Mongolia and southern Siberia. A total of approximately 500 earthquake seismograms were used. These were recorded at the Makanchi and Ulan-Bator stations at distances of ~300–1900 km. It is shown that the attenuation of shear waves is much stronger in the west of the area of study compared with the east. A V-shaped band of high attenuation in the upper mantle has been identified in the west of the area where the epicenters of the magnitude 6.9 1990 Zaisan and the magnitude 7.3 2003 Chuya earthquakes were situated; a similar band extends northwestward to the west of Lake Ubsu Nur. The attenuation is comparatively low in the rupture zones of large (М ≥ 7.0) pre-1970 earthquakes. It was concluded that fluid-charged zones are formed in the lithosphere prior to large earthquakes in the Altai, as well as in other areas of Central Asia. Following large seismic events, the fluids were rising into the crust from the upper mantle during a few tens of years, thus reducing the attenuation of Sn waves. We have identified zones of high attenuation with no significant earthquakes being recorded there during historical time. It is our opinion that earthquake precursory processes may be occurring in these zones.