Geomagnetism and Aeronomy最新文献_第2页

Erratum to: Geo-Effectiveness of Halo CMEs Based on Magnetic Parameters of the Solar Active Region 基于太阳活动区磁参数的光晕日冕物质抛射地球有效性勘误

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-07-01 DOI: 10.1134/S0016793225550018

P. Vijayalakshmi, A. Shanmugaraju, M. Syed Ibrahim

引用次数: 0

A New Approach on the Complex Diffusion Tensor in the Ionospheric F-region with Low Latitudes 低纬度电离层f区复扩散张量的新方法

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-07-01 DOI: 10.1134/S0016793225600092

Mehmet Yaşar, Kadri Kurt, Ali Yeşil

引用次数: 0

Comparison of NeQuick and IRI Models with Ionosonde Data for Ionospheric Electron Density Measurements NeQuick和IRI模型与电离层电子密度测量数据的比较

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-05-19 DOI: 10.1134/S001679322460019X

Lake Endeshaw

{"title":"Comparison of NeQuick and IRI Models with Ionosonde Data for Ionospheric Electron Density Measurements","authors":"Lake Endeshaw","doi":"10.1134/S001679322460019X","DOIUrl":"10.1134/S001679322460019X","url":null,"abstract":"Ground-based electron density measurements from ionosondes are used to evaluate the accuracy of ionospheric empirical models, such as the International Reference Ionosphere (IRI) and the NeQuick models. In the present study, the results obtained from ionosonde and empirical models (NeQuick2, IRI2016, and IRI2020) of the electron density at the Addis Ababa, Ethiopia ionosonde station, with a geographic latitude of 9.03° N and longitude 38.76° E on selected days in 2014 are presented. In the comparison of the NeQuick2, IRI2016, and IRI2020 models with the ionosonde data, the percentage deviation and the correlation coefficient (R) are used as measures of the performance of the models. The overall results show that the latest version of the IRI2020 model outperforms NeQuick2 and IRI2016 in ionospheric electron density value, with NeQuick2 showing slightly better performance than IRI2016. Mostly, the NeQuick2, IRI2016, and IRI2020 models show overestimation of the electron density values from the ionosonde data. The NeQuick2 model overestimates with a maximum percentage deviation of 38%; the IRI2016 model overestimates with a maximum percentage deviation of 40%; and the IRI2020 model overestimates with a maximum percentage deviation of 30% from the ionosonde data measurements, while underestimating with percentage deviations of 10, 18, and 9%, respectively. The average values of the correlation coefficients of the NeQuick2, IRI2016, and IRI2020 models are 0.79, 0.74, and 0.81, respectively.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"65 1","pages":"9 - 23"},"PeriodicalIF":0.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145986743","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

Geo-Effectiveness of Halo CMEs Based on Magnetic Parameters of the Solar Active Region 基于太阳活动区磁场参数的光晕日冕物质抛射地球效应

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-05-19 DOI: 10.1134/S0016793224600991

P. Vijayalakshmi, A. Shanmugaraju, M. Syed Ibrahim

{"title":"Geo-Effectiveness of Halo CMEs Based on Magnetic Parameters of the Solar Active Region","authors":"P. Vijayalakshmi, A. Shanmugaraju, M. Syed Ibrahim","doi":"10.1134/S0016793224600991","DOIUrl":"10.1134/S0016793224600991","url":null,"abstract":"While the link between coronal mass ejections (CMEs) and geomagnetic storms has been well established, the prediction of intensity and forecasting of the storms are necessary to notify the adverse effects in advance. In this work, we explore the relationship of the intensity of geomagnetic storm (Dst index) and southward magnetic component (Bs) with the magnetic parameters of the source active region (Space-weather HMI Active Region Patch, SHARP parameters) during 2011‒2017 to find the connection between the magnetic parameters of the source active region and geo-effectiveness. A set of 31 halo CMEs is found to have produced geomagnetic storms from 2011 to 2017. The preliminary analysis shows that these events erupted from active regions with strong and complex magnetic field structures and found to be associated with weak to intense storms (‒6 to ‒223 nT). The following important results are obtained from the detailed analysis: (i) Most of the storms are caused from the events near disk center to western longitudes except three. (ii) Moderate correlations are found between some magnetic parameters of the source active region with the intensity of the storm and southward magnetic field component. (iii) Empirical relations are derived for storm intensity and southward magnetic component in terms of important source region magnetic parameters. Furthermore, we got good correlation for the product of speeds of interplanetary coronal mass ejection (VICME) and Bs with the Dst index. These findings reveal the Sun–Earth connection of certain events and give some clues on improving our ability to connect the intensity of geomagnetic storms with CME kinematics and source region magnetic parameters.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"65 3","pages":"47 - 61"},"PeriodicalIF":0.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145993782","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

Ionospheric TEC Forecast Using LSTM during High-Intensity Solar Flares Occurred during the Year 2024 and Validation with IRI-2017 基于LSTM的2024年高强度太阳耀斑电离层TEC预报及iris -2017的验证

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-04-21 DOI: 10.1134/S0016793224601030

B. Raghavi, R. Mukesh, S. Muthamil, S. Nivetha, T. Muthu, Sarat C. Dass, S. Kiruthiga

{"title":"Ionospheric TEC Forecast Using LSTM during High-Intensity Solar Flares Occurred during the Year 2024 and Validation with IRI-2017","authors":"B. Raghavi, R. Mukesh, S. Muthamil, S. Nivetha, T. Muthu, Sarat C. Dass, S. Kiruthiga","doi":"10.1134/S0016793224601030","DOIUrl":"10.1134/S0016793224601030","url":null,"abstract":"Satellite communication and navigation systems are increasingly essential in modern society, making it crucial to understand the impact of solar activity on these technologies. Total electron content (TEC) significantly influences satellite performance, necessitating accurate forecasting to maintain operational reliability. This research focuses on predicting TEC during eleven distinct X-class solar flares that occurred in February, March, May, June, and August 2024, utilizing a long short-term memory (LSTM) model. The study employs a comprehensive dataset of TEC data sourced from the IONOLAB database, alongside important solar and geomagnetic parameters such as Kp, Ap, SSN, and F10.7 obtained from NASA OmniWeb. The model’s predictive performance was validated against the IRI-2017 model. Results demonstrate that the LSTM model effectively captures TEC variations during periods of extreme solar activity, consistently outperforming the IRI-2017 model. For instance, during significant solar events, the LSTM model achieved notable performance metrics, indicating its capability to provide precise TEC forecasts. This research contributes to the advancement of space weather forecasting models, enhancing the reliability of satellite-dependent systems critical for global communication and navigation.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"65 2","pages":"25 - 45"},"PeriodicalIF":0.7,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145986761","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

Disturbances in Ionospheric Electric Field Measurements Due to Earth’s Magnetic Field 地球磁场对电离层电场测量的干扰

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-04-21 DOI: 10.1134/S0016793225600018

Soraya Makhlouf, Mourad Djebli

引用次数: 0

A Case Study of Daily and Seasonal Changes in Total Electron Content in Mid-Latitudes Regions in the Period of 2019–2021 2019-2021年中纬度地区总电子含量日变化及季节变化分析

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-03-13 DOI: 10.1134/S0016793224601054

Banafsheh Taji, Mohammad Hossein Memarian, Seyed Mohammad Rastegar

{"title":"A Case Study of Daily and Seasonal Changes in Total Electron Content in Mid-Latitudes Regions in the Period of 2019–2021","authors":"Banafsheh Taji, Mohammad Hossein Memarian, Seyed Mohammad Rastegar","doi":"10.1134/S0016793224601054","DOIUrl":"10.1134/S0016793224601054","url":null,"abstract":"The behavior of the total electron content (TEC) on a global scale has been the subject of research for several years. However, certain features of this behavior, including the effectiveness of energetic particles and their anomalies at different latitudes, are poorly understood. This research reports a comparative analysis of the seasonal and daily changes in the TEC as observed from 2019 to 2021 (low solar activity) in the mid-latitudes between 33.1 and 40.1 degrees. The points include eight stations across four countries with the following coordinates: Tehran (Iran), Hamedan (Iran), Tabriz (Iran), Yerevan (Armenia), Diyarbakir (Turkey), Ankara (Turkey), Nicosia (Cyprus), and Baghdad (Iraq). Also, by taking the quiet solar activity conditions into account, TEC’s variations have been investigated hourly, daily, and seasonally. For this research, TEC observations from the Global Positioning System (GPS) have been analyzed. The results showed that the highest TEC values occurred during 0900–1100 UT (1300–1500 LT), and the lowest values occurred during 2400–0200 UT (400–600 LT). From a seasonal point of view, in 2019, the maximum value of TEC was observed during the March equinox, and the lowest maximum value of TEC was observed during the December solstice, but in 2020 and 2021 the maximum value of TEC was observed during the June solstice and September equinox, the lowest value of TEC is observed during the December solstice.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 1 supplement","pages":"S85 - S96"},"PeriodicalIF":0.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612224","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

Testing the Deterministic Component of the Time Series of Wolf Numbers by Methods of Algorithmic Complexity 用算法复杂度的方法检验狼数时间序列的确定性成分

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-02-14 DOI: 10.1134/S0016793224700440

N. G. Makarenko, D. M. Volobuev, A. S. Rybintsev

{"title":"Testing the Deterministic Component of the Time Series of Wolf Numbers by Methods of Algorithmic Complexity","authors":"N. G. Makarenko, D. M. Volobuev, A. S. Rybintsev","doi":"10.1134/S0016793224700440","DOIUrl":"10.1134/S0016793224700440","url":null,"abstract":"This article discusses the testing of the complexity of the instrumental series of Wolf numbers. The work is initiated by the hypothesis of the existence of a low-dimensional dynamo as a model of the Sun’s magnetic activity. This mechanism produces the observable, in the Takens sense, as a broadband chaotic signal with a dominant 11-year mode (Frick et al., 2022). The time series of Wolf numbers is claimed to be this signal. In this article, we consider two problems. In the first, we describe a method for obtaining the average cycle for the dominant 11-year mode. It is based on the Fisher–Rao metric and the quantum mechanical analog of “probability amplitudes” for cycles. In the second problem, we investigate the algorithmic complexity of the instrumental series of Wolf numbers (SSN2) compared with surrogate data obtained by fractal mixing of this series. The mixing “whitens” the 11-year cycle but retains tuples of 2–3 monthly mean counts. Complexity was estimated as permutation entropy (Bandt et al., 2002). It was hypothesized that if the dominant mode was chaotic in nature, the complexity of the source and surrogate series would be close. Our results do not contradict the hypothesis of a chaotic signal with a single prevalent mode as a time series model of Wolf numbers.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 8","pages":"1318 - 1327"},"PeriodicalIF":0.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423090","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

γ Cas Stars: The Origin of the X-ray Emission γ - Cas恒星：x射线发射的起源

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-02-14 DOI: 10.1134/S0016793224700361

A. F. Kholtygin, E. B. Ryspaeva

引用次数: 0

Climate Variations and Solar Activity in the Holocene 全新世气候变化与太阳活动

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-02-14 DOI: 10.1134/S0016793224700476

I. V. Kudryavtsev, V. A. Dergachev, Yu. A. Nagovitsyn

引用次数: 0