Geomagnetism and Aeronomy最新文献_第4页

Identification of Geomagnetic Disturbances in Near-Earth Space from Satellite Observations during the Magnetic Storm on March 8–9, 1970 从 1970 年 3 月 8-9 日磁暴期间的卫星观测中识别近地空间的地磁扰动

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-08-13 DOI: 10.1134/S001679322460036X

A. A. Soloviev, I. O. Belov, A. V. Vorobev, V. N. Sergeev

引用次数: 0

Hilbert Transformation and Properties of Solar Cycles in Envelope−Instantaneous Frequency Variables 包络瞬时频率变量中的希尔伯特变换和太阳周期特性

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-08-13 DOI: 10.1134/S0016793224600383

I. G. Shibaev

{"title":"Hilbert Transformation and Properties of Solar Cycles in Envelope−Instantaneous Frequency Variables","authors":"I. G. Shibaev","doi":"10.1134/S0016793224600383","DOIUrl":"10.1134/S0016793224600383","url":null,"abstract":"When analyzing a narrowband signal, the Hilbert transform is often used, which makes it possible to describe the process through slowly changing functions: the envelope (amplitude) and, weakly dependent on time, the characteristic signal frequency—the “instantaneous” frequency. Based on the smoothness of these characteristics, one can evaluate the process and compare it at different periods. This approach was used to analyze the spectral components of a series of average monthly Wolf numbers. This description of the main and second harmonics, supplemented by the properties of the long-period component, gives a fairly complete picture of the entire series of monthly averages. The work examines the correspondence of the characteristics of reliable data, with this approach, to the accepted description in terms of the parameters of cycles (maximum of the cycle, duration of the cycle, and its growth branches) and constructs an “envelope” of the maxima of the cycles. The time dynamics of the instantaneous frequencies of the fundamental and second harmonics of the entire series are also presented, and significant differences in their behavior are noted in the intervals corresponding to the reconstructed and reliable parts.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ion Transport from Soil to Air and Electric Field Amplitude of the Boundary Layer 从土壤到空气的离子传输与边界层的电场振幅

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-08-13 DOI: 10.1134/S0016793223600613

Ahmad Muhammad, Fatih Külahcı, Salim Jibrin Danbatta

{"title":"Ion Transport from Soil to Air and Electric Field Amplitude of the Boundary Layer","authors":"Ahmad Muhammad, Fatih Külahcı, Salim Jibrin Danbatta","doi":"10.1134/S0016793223600613","DOIUrl":"10.1134/S0016793223600613","url":null,"abstract":"The presence of ions within the atmospheric region near the soil surface has considerable implications for enhancing our understanding of Earth’s complex systems. This study delves into the intricate relationship between the atmospheric electric field in the boundary layer and lithosphere. The focus was specifically on investigating how soil radon and its progeny influence the production rate of ions in both the soil and the atmosphere. To achieve this, we combined the radon transport equation with advanced machine learning techniques. Using a well-suited machine learning model, we effectively modeled the responses of soil radon and seamlessly integrated them into the radon transport equation. The resulting insights were used to predict the rates at which radon-induced ion pairs were produced. A particularly important parameter is the surface-ion production rate, which is crucial for estimating the amplitude of the near-surface electric field. This methodology was applied to analyze data from two radon monitoring stations in Turkey: Erzincan, located along the North Anatolian Fault (NAF), and Malatya, situated close to the East Anatolian Fault regions. The significance of this estimation approach resonates within the field of lithospheric–atmospheric studies. This innovative methodology holds promise as a valuable tool for future investigations in the domains of lithosphere–atmosphere–ionosphere coupling (LAIC), global electric circuits (GEC), and seismo-ionospheric coupling. Ultimately, this study underscores the importance of carefully considering the intricate interconnections that exist among different components of Earth’s intricate system. This advocates the adoption of novel methods to shed light on these complex interactions.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of the Northern Auroral Oval in Light of Modern Changes in Earth’s Magnetic Field 从地球磁场的现代变化看北极光椭圆的演变

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-08-13 DOI: 10.1134/S0016793224600309

A. A. Petrova, O. V. Latysheva

{"title":"Evolution of the Northern Auroral Oval in Light of Modern Changes in Earth’s Magnetic Field","authors":"A. A. Petrova, O. V. Latysheva","doi":"10.1134/S0016793224600309","DOIUrl":"10.1134/S0016793224600309","url":null,"abstract":"Active development of the Arctic and increased intensity of navigation along the Northern Sea Route and air traffic in the Arctic Ocean airspace draws attention to the problem of disruptions of transpolar radio wave propagation. In high-latitude regions, the passage of navigation signals of global positioning systems depends on the state of the ionosphere. During geomagnetic disturbances, ionospheric inhomogeneities develop that interfere with satellite positioning systems. The position and shape of auroras depend on the state of the magnetosphere. In this study, the component model of the auroral magnetic field has been calculated for the first time using the updated digital model of the full values of Earth’s magnetic field components of the St. Petersburg Branch of the Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Russian Academy of Sciences for the first time. The magnetic field of the auroral zone was calculated for heights from 0 to 1000 km for the period from 1900 to 2023, including for heights of 100–110 km, where the intensity of auroras reaches its maximum in the near-Earth space of the Arctic. The spatial displacement of the auroral oval has been estimated for the period from 1957 (its first mathematical description) to the present. As the analysis showed, the displacement of the boundaries of the auroral oval during the period under consideration has occurred in time and in space codirectionally with the displacement of the isolines of the extremes of the horizontal and vertical components of the auroral magnetic field of the Northern Hemisphere.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long-Term Trends in the Height of the Ionospheric F2 Layer Peak 电离层 F2 层峰高的长期趋势

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-08-13 DOI: 10.1134/S0016793224600322

A. D. Danilov, A. V. Konstantinova, N. A. Berbeneva

引用次数: 0

Influence of Solar Activity Variations on Interdiurnal Variability of NmE in Geomagnetically Quiet Conditions Obtained from Ground-Based Dourbes Ionosonde Data 地磁静止条件下太阳活动变化对 NmE 日间变化的影响（由地基 Dourbes 电离层探测仪数据获得

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-06-19 DOI: 10.1134/S0016793224600139

A. V. Pavlov, N. M. Pavlova

{"title":"Influence of Solar Activity Variations on Interdiurnal Variability of NmE in Geomagnetically Quiet Conditions Obtained from Ground-Based Dourbes Ionosonde Data","authors":"A. V. Pavlov, N. M. Pavlova","doi":"10.1134/S0016793224600139","DOIUrl":"10.1134/S0016793224600139","url":null,"abstract":"The article studies interdiurnal variations in the statistical characteristics of the electron number density NmE of the ionospheric E layer peak for each month of the year in geomagnetically quiet conditions with low and average solar activity based on hourly measurements of the critical frequency of the E layer from the ground-based Dourbes ionosonde from 1957 to 2023. The authors have calculated the mathematical expectation NmEE; the most probable NmEMP; the arithmetically monthly median NmEMED; the standard deviations of σE, σMP and σMED of quantity NmE from NmEE, NmEMP, and NmEMED; the variation coefficients CVE, CVMP, and CVMED of quantity NmE with respect to NmEE, NmEMP, and NmEMED, respectively. It is shown that NmEE provides the best description of the set of measurements of NmE using only the statistical parameter due to the smaller interdiurnal variability of NmE compared to NmEMP or NmEMED. For the first time, it is proved that the transition from low to average solar activity leads to significant changes in the interdiurnal variability of NmE, with the longest periods of increase and decrease in the studied variability in March and December, respectively.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141518507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative Analysis of Meridional and Azimuthal Propagation of Magnetic Variations and Equivalent Current Vortices of Geomagnetic Pc5 Pulsations 地磁 Pc5 脉动的磁性变化和等效电流漩涡的经向和方位传播对比分析

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-06-19 DOI: 10.1134/S0016793224600061

A. V. Moiseev, V. I. Popov, S. A. Starodubtsev

引用次数: 0

Trends in the Сritical Frequency foF2 at Stations of the Northern and Southern Hemispheres 南北半球观测站临界频率 foF2 的变化趋势

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-06-19 DOI: 10.1134/S0016793224600085

A. D. Danilov, A. V. Konstantinova, N. A. Berbeneva

引用次数: 0

NmF2 Variability at Different Longitudes in Mid-Latitudes: The Role of Geomagnetic Activity 中纬度地区不同经度的 NmF2 变异：地磁活动的作用

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-06-19 DOI: 10.1134/S0016793224600073

V. Kh. Depuev, M. G. Deminov, G. F. Deminova, A. Kh. Depueva

{"title":"NmF2 Variability at Different Longitudes in Mid-Latitudes: The Role of Geomagnetic Activity","authors":"V. Kh. Depuev, M. G. Deminov, G. F. Deminova, A. Kh. Depueva","doi":"10.1134/S0016793224600073","DOIUrl":"10.1134/S0016793224600073","url":null,"abstract":"Based on data from mid-latitude ionospheric stations at close corrected geomagnetic latitudes, the properties of the variability in the F2 layer peak density (NmF2) at different longitudes were analyzed during increased (48 > ap(τ) > 27) and high (ap(τ) > 48) geomagnetic activity, where ap(τ) is the weighted average ap-index of this activity. The standard deviation σ of Nm fluctuations with respect to the quiet level and the average shift of these fluctuations xave were used as characteristics of this variability. It was found that at all analyzed stations, the variance σ 2 for increased geomagnetic activity is greater than for quiet conditions but hardly differs from σ 2 for high geomagnetic activity. For all analyzed cases, the average shift xave < 0, and for high geomagnetic activity, the absolute value of xave is greater than for increased geomagnetic activity. The difference in xave values between the analyzed stations is quite large. One reason for this difference may be related to the dependence of xave on geomagnetic latitudes. Approximations of the geomagnetic field by the tilted dipole (TD), eccentric dipole (ED), or using corrected geomagnetic (CGM) coordinates were used to select these latitudes. It was found that the dependence of xave on ED latitude is more accurate than the dependence of xave on TD latitude and, moreover, the dependence of xave on CGM latitude. Therefore, ED latitudes, and not CGM latitudes, are optimal for accounting for storm effects on the F2 layer peak density at mid-latitudes. This conclusion has apparently been obtained for the first time.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141518505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal and Daily Features of the Characteristics of Medium-Scale Traveling Ionospheric Disturbances in Asian Russia in Years of Moderate Solar Activity 中度太阳活动年俄罗斯亚洲中尺度移动电离层扰动特征的季节和日常特点

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-06-19 DOI: 10.1134/S001679322460005X

V. I. Kurkin, A. V. Podlesny, M. V. Tsedrik, A. V. Soph’in

引用次数: 0