Time filter

Source Type

Pulinets S.A.,Fiodorov Institute of Applied Geophysics | Bondur V.G.,Aerocosmos Scientific Center for Aerospace Monitoring | Tsidilina M.N.,Aerocosmos Scientific Center for Aerospace Monitoring | Gaponova M.V.,Aerocosmos Scientific Center for Aerospace Monitoring
Geomagnetism and Aeronomy | Year: 2010

The variability of the ionosphere during April-May, 2008, has been analyzed in detail in order to reveal anomalous variations related to seismic activity, initiated by the strongest Wenchuan earthquake (M = 7.9) in the Sichuan province on May 12, 2008. Information about the total electron content (TEC) from the network of GPS receivers in the earthquake region, the global IONEX TEC maps, and the reconstructed vertical profiles of electron density according to the data of GPS receivers were used as a data source. The spatial and time localization of the observed anomalies, their morphological features, and the absence of geomagnetic disturbances during the observation period undoubtedly demonstrate that the observed variations were caused by seismic activity. © Pleiades Publishing, Ltd., 2010.


Bondur V.G.,Aerocosmos Scientific Center for Aerospace Monitoring | Grebenyuk Y.V.,Aerocosmos Scientific Center for Aerospace Monitoring | Sabinin K.D.,Aerocosmos Scientific Center for Aerospace Monitoring
Izvestiya - Atmospheric and Ocean Physics | Year: 2010

Based on the results of processing experimental data obtained from measurements of current velocities and water temperatures on the United States Atlantic Shelf and near the Hawaii Islands (the island of Oahu and Mamala Bay), we perform a comparative analysis of the characteristics of internal waves in these representative areas of continental and island shelves of the ocean. These investigations indicate that the internal-wave fields in these areas are very different from one another in both the low-and high frequency ranges. On the Atlantic Shelf, we have regularly observed tandems of powerful internal solitons clearly seen on space imagery of the oceanic surface. On the island shelves, soliton-type internal waves were less seldom seen as very specific oscillations. The absence of surface manifestations of even powerful solitons in Mamala Bay is explained both by the large pycnocline depth and by the fact that the vertical structure of these solitons is controlled by the second rather than the first mode, as it is on the Atlantic Shelf. © Pleiades Publishing, Ltd., 2010.


Bondur V.G.,Aerocosmos Scientific Center for Aerospace Monitoring | Grebenyuk Y.V.,Aerocosmos Scientific Center for Aerospace Monitoring | Muyakshin S.I.,Novgorod State University | Sabinin K.D.,Russian Academy of Sciences
Izvestiya - Atmospheric and Ocean Physics | Year: 2011

This paper analyzes the results of investigations into extremely large releases of current velocities registered by an acoustic Doppler profiler during experiments performed on the Hawaii shelf. An integral analysis of the variability of current fields relies on the profile data of current velocities, temperature, and acoustic-scattering layers. Based on these investigations, we proposed a hypothesis stating that the small-scale variability of currents in profiler data is conditioned by the passage of fine vortices emerging in the outflow and rise of freshened waters from a subsurface sink near the shelf edge. To confirm this hypothesis on the emergence mechanism of the observed releases of current velocities, we conducted a mathematical simulation of the response that the Doppler meter has to the passage of fine vortex, which revealed a good agreement between model calculations and experimental data. Similar phenomena were also found in the Gelendzhik Bay of the Black Sea. © 2011 Pleiades Publishing, Ltd.

Loading Aerocosmos Scientific Center for Aerospace Monitoring collaborators
Loading Aerocosmos Scientific Center for Aerospace Monitoring collaborators