Article
Meteorology & Atmospheric Sciences
Xuefang Yang, Wenmin Qin, Lunche Wang, Ming Zhang, Zigeng Niu
Summary: The study examined the spatial-temporal variations and driving factors of surface solar radiation (SSR) over mainland China, finding that SSR exhibited fluctuating trends influenced by meteorological conditions and aerosol concentrations. The results contribute to the understanding of SSR patterns in the context of climate change and land surface processes.
ATMOSPHERIC RESEARCH
(2021)
Article
Environmental Sciences
Tariq Rashid, Chidambaram Sabarathinam, Habib Al-Qallaf, Harish Bhandary, Mariam Al-Jumaa, Ahmed Shishter, Bandar Al-Salman
Summary: This study investigates the spatiotemporal evolution of hydrochemical characteristics of the Shagaya water field in Kuwait. The results show a significant decrease in TDS concentration over time, which is attributed to the inflow of better-quality water from the up gradient parts of the aquifers. The salinization phenomenon is found to be caused by rock-water interaction, ion exchange, and mixing between different groundwater sources.
Article
Geochemistry & Geophysics
G. Ropp, V Lesur
Summary: A series of models of the Earth magnetic field and core surface flow have been estimated from 1999 to 2022 using magnetic satellite and ground observatory data. The models show characteristics similar to previous models, but with higher time resolution. Principal component analysis reveals that the largest flow variations occur at high latitudes and under the western part of the Pacific Ocean. Filtering out longer flow variation periods leads to a filtered azimuthal flow with approximately 7-year periodicities propagating westward. These patterns are mainly present at mid- and equatorial latitudes and are compatible with perturbations in the main flow caused by small columnar flows intersecting the core-mantle boundary.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Physics, Applied
Shinji Isogami, Yuto Oishi, Chikara Furukawa, Nobuhito Ohnishi, Kan Okubo
Summary: The study found that reducing the cutoff frequency of a TMR magnetometer is a promising approach for detecting field oscillations occurring over long periods, such as 100 s, even though it may reduce the detectable intensity.
APPLIED PHYSICS EXPRESS
(2021)
Article
Geochemistry & Geophysics
Toshiko Terakawa, Mitsuhiro Matsu'ura
Summary: We developed an inversion method to estimate 3-D tectonic stress fields using centroid moment tensor (CMT) data from seismic events. The analysis of 24 years of data in northeast Japan revealed that the tectonic stress orientation was stable for 14 years before the 2011 megathrust event. However, there is a possibility of significant changes in tectonic stress orientation in the post-seismic period. The evaluation results indicate that the stress orientation change in the region off Fukushima and Ibaraki is real.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Biodiversity Conservation
Xuexian An, Wenping Jin, Huaiqing Zhang, Yang Liu, Meng Zhang
Summary: This paper analyzes the spatial and temporal changes in the distribution of wetlands in China over the past two decades using LULC data. The study finds that the total area of wetlands in China has been increasing, with the provinces of Qinghai, Tibet, and Xinjiang showing the highest increase. Factors such as climate conditions, agricultural and economic conditions, urbanization, and population growth have influenced the wetland changes.
ECOLOGICAL INDICATORS
(2022)
Article
Geochemistry & Geophysics
Igor I. Mokhov, Dmitry A. Smirnov
Summary: Contributions of insolation variations to surface air temperature trends at different latitudes of Northern and Southern Hemispheres on various time scales were estimated using empirical autoregressive models. Results showed that the contributions of insolation variations to temperature trends were statistically insignificant during the studied time intervals. The inclusion of insolation variations weakly influenced the estimates of greenhouse gases and natural variability modes' contributions to temperature trends, with changes not exceeding several percent. Numerically, the estimated contributions of insolation variations could significantly exceed those of natural variability modes on both short-term (less than two decades) and long-term (over a century) time scales.
PURE AND APPLIED GEOPHYSICS
(2023)
Article
Astronomy & Astrophysics
Rajkumar Hajra, Adrian Marques de Souza Franco, Ezequiel Echer, Mauricio Jose Alves Bolzan
Summary: The study reveals a dominant 10-11-year periodicity in geomagnetic activity, mainly influenced by the solar activity cycle, with solar wind speed inducing longer and shorter term variations. Solar cycles 20 and 24 are found to be weaker compared to cycles 19, 21, 22, and 23, and if the decreasing trend continues in cycle 25, it may have significant implications for space weather science and operations.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Geochemistry & Geophysics
Norbert R. Nowaczyk
Summary: The study conducted experiments on diluted slurry prepared from natural glacial Black Sea sediments, revealing a slightly non-linear function relationship between magnetization and magnetic field in the artificial samples used. Normalization calculations showed that all samples exhibit a typical magnetic fabric of natural sediments with an anisotropy range of 6-7%.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Ryohko Ishikawa, Javier Trujillo Bueno, Tanausu del Pino Aleman, Takenori J. Okamoto, David E. McKenzie, Frederic Auchere, Ryouhei Kano, Donguk Song, Masaki Yoshida, Laurel A. Rachmeler, Ken Kobayashi, Hirohisa Hara, Masahito Kubo, Noriyuki Narukage, Taro Sakao, Toshifumi Shimizu, Yoshinori Suematsu, Christian Bethge, Bart De Pontieu, Alberto Sainz Dalda, Genevieve D. Vigil, Amy Winebarger, Ernest Alsina Ballester, Luca Belluzzi, Jiri Stepan, Andres Asensio Ramos, Mats Carlsson, Jorrit Leenaarts
Summary: Unprecedented spectropolarimetric observations of an active region plage and its surrounding enhanced network reveal the role of magnetic field in coupling different atmospheric layers and heating the plage chromosphere.
Article
Green & Sustainable Science & Technology
Lingxiao Li, Jiaxuan Zhang, Kai Chen, Junping Zhang
Summary: Solar evaporators derived from cuttlebone, modified with a photothermal composite, show excellent photothermal effect and stable evaporation rate, allowing for efficient water collection under natural sunlight.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Review
Astronomy & Astrophysics
Bidya Binay Karak
Summary: One obvious feature of the solar cycle is its variation from one cycle to another. This article reviews the dynamo models for the long-term variations of the solar cycle, including modulations beyond the 11-year periodicity. The article discusses the causes for the modulation, presents illustrative models, and highlights the current trends and challenges.
LIVING REVIEWS IN SOLAR PHYSICS
(2023)
Article
Astronomy & Astrophysics
Ronald M. Caplan, Cooper Downs, Jon A. Linker, Zoran Mikic
Summary: This study investigates the potential field solutions for the global coronal magnetic field on June 13, 2012, and explores how different choices in boundary conditions, resolution, and input maps may influence the solution properties. The results show that coronal morphology and magnetic flux are most strongly influenced by the outer boundary condition, while large-scale morphologies and open magnetic flux are insensitive to model resolution.
ASTROPHYSICAL JOURNAL
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Md Hasanuzzaman Khan, Xinfeng Huang, Xiaofei Tian, Changjie Ouyang, Dongmei Wang, Shuang Feng, Jutao Chen, Tian Xue, Jin Bao, Xin Zhang
Summary: This study evaluated the effects of 3.5-23.0 T SMF exposure on mouse behavior. The results showed that short exposures to high-field SMFs had minimal side effects on healthy mice and may even have positive effects on mood and memory.
EUROPEAN RADIOLOGY
(2022)
Article
Astronomy & Astrophysics
Yiding Chen, Libo Liu, Huijun Le, Hui Zhang, Ruilong Zhang
Summary: The long-term variation of the ionosphere has attracted attention, and this study investigates the contributions of different sources to this variation. By analyzing f(o)F(2) records, the study identifies and explores the long-term component related to geomagnetic activity and increasing greenhouse gas. It also finds a seasonal discrepancy in this component and suggests that frequent weak geomagnetic activity may be responsible for the seasonal variation of f(o)F(2) related to geomagnetic activity.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2022)
Article
Geochemistry & Geophysics
P. V. Strekalova, Yu. A. Nagovitsyn, V. V. Smirnova
GEOMAGNETISM AND AERONOMY
(2018)
Article
Geochemistry & Geophysics
I. V. Kudryavtsev, D. M. Volobuev, V. A. Dergachev, Yu. A. Nagovitsyn, M. G. Ogurtsov
GEOMAGNETISM AND AERONOMY
(2018)
Article
Astronomy & Astrophysics
Yu. A. Nagovitsyn, V. G. Ivanov, N. N. Skorbezh
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
(2019)
Article
Astronomy & Astrophysics
Nina V. Karachik, Alexei A. Pevtsov, Yury A. Nagovitsyn
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Yu. A. Nagovitsyn, V. G. Ivanov, A. A. Osipova
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
(2019)
Article
Astronomy & Astrophysics
Yury A. Nagovitsyn, Aleksandra A. Osipova
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Yury A. Nagovitsyn, Aleksandra A. Osipova, Alexei A. Pevtsov
Summary: The study revealed that the tilt angles of solar active regions exhibit non-linear changes with latitude, with significant differences between large long-living groups and small short-living groups. This implies potential differences in the physical properties and formation mechanisms of the two populations of solar groups.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Y. A. Nagovitsyn, A. A. Osipova, E. Y. Nagovitsyna
Summary: Traditional indices describe solar activity while generative indices aim to describe the productivity of the solar dynamo by focusing on maximum magnetic region areas. This study compiles a unified 145-year series of generative indices using sunspot group data from two archives, revealing a 50-year variation in several indices and a potential additional secular cycle on the Sun.
Article
Astronomy & Astrophysics
Yury A. Nagovitsyn, Aleksandra A. Osipova
Summary: The aim of this work is to establish a long (410-yr) series of average annual total sunspot areas and analyze the relationship and periodicity between different sunspot indices for reconstruction.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Review
Astronomy & Astrophysics
Alexei A. Pevtsov, Luca Bertello, Yury A. Nagovitsyn, Andrey G. Tlatov, Valery V. Pipin
Summary: This study reviews the history of solar magnetic field observations and emphasizes the importance of historical data in detecting and understanding long-term trends in solar activity. Research demonstrates the value of historical data through studies of active region tilt and magnetic field evolution, revealing that the magnetic properties of sunspots have remained consistent over the past century.
JOURNAL OF SPACE WEATHER AND SPACE CLIMATE
(2021)
Article
Astronomy & Astrophysics
Yury A. Nagovitsyn, Alexei A. Pevtsov
ASTROPHYSICAL JOURNAL LETTERS
(2020)
Article
Geochemistry & Geophysics
V. A. Dergachev, I. Kudryavtseva, Yu A. Nagovitsyn
GEOMAGNETISM AND AERONOMY
(2019)
Article
Geochemistry & Geophysics
Yu. A. Nagovitsyn, A. A. Osipova
GEOMAGNETISM AND AERONOMY
(2018)
Article
Geochemistry & Geophysics
Yu. A. Nagovitsyn, A. A. Pevtsov, A. A. Osipova, V. G. Ivanov
GEOMAGNETISM AND AERONOMY
(2018)
Article
Astronomy & Astrophysics
Yury A. Nagovitsyn, Alexei A. Pevtsov
Summary: The study analyzed the distribution of sunspot areas based on observational data, introducing a precision randomization method to account for measurement uncertainties. It confirmed the presence of two distinct components in the distribution of sunspots and showed that the area distribution can be described by the sum of two lognormal distributions. Additionally, it demonstrated a correlation between the area of main spots and the total area of sunspot groups.
ASTROPHYSICAL JOURNAL
(2021)
