Geomagnetism and Aeronomy最新文献_第6页

Dependence of foF2 on Solar Activity Indices Based on the Data of Ionospheric Stations of the Northern and Southern Hemispheres 基于南北半球电离层观测站数据的 foF2 与太阳活动指数的关系

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601035

A. D. Danilov, N. A. Berbeneva

{"title":"Dependence of foF2 on Solar Activity Indices Based on the Data of Ionospheric Stations of the Northern and Southern Hemispheres","authors":"A. D. Danilov, N. A. Berbeneva","doi":"10.1134/S0016793223601035","DOIUrl":"10.1134/S0016793223601035","url":null,"abstract":"An analysis of the dependence of the F2-layer critical frequency on solar activity indices that has been started earlier based on the Juliusruh station data is continued. The data of six stations in the Northern Hemisphere and five stations in the Southern Hemisphere are analyzed in this paper. The determination coefficient R2 for the foF2 dependence on solar activity in each particular situation (station, month, local time) is taken as a measure of the quality of that dependence. The conclusion that a well-pronounced diurnal variation in R2 is observed in the winter months is confirmed for four solar activity proxies: this value is maximum and changes weakly in the daytime but decreases substantially to the nighttime hours. It is found that the F30 proxy is the best solar proxy to describe the foF2 behavior in the solar cycle, whereas the sunspot number Rz is the worst. Based on a comparison of the changes in R2 with LT in the same months at stations of the Northern and Southern hemispheres, it is shown that the aforementioned well-pronounced diurnal behavior in R2 is observed only in winter and is absent in summer.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140806651","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

Abnormal Quasi-Recurrent Variations of Cosmic Rays in September 2014–February 2015 2014年9月至2015年2月宇宙射线的异常准逆流变化

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601096

N. S. Shlyk, A. V. Belov, V. N. Obridko, M. A. Abunina, A. A. Abunin

引用次数: 0

Criteria for Forecasting Proton Events by Real-Time Solar Observations 通过实时太阳观测预报质子事件的标准

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223600984

A. B. Struminsky, A. M. Sadovskii, I. Yu. Grigorieva

{"title":"Criteria for Forecasting Proton Events by Real-Time Solar Observations","authors":"A. B. Struminsky, A. M. Sadovskii, I. Yu. Grigorieva","doi":"10.1134/S0016793223600984","DOIUrl":"10.1134/S0016793223600984","url":null,"abstract":"The sequence for overcoming the threshold values of a number of physical characteristics for proton event forecasting in real time is discussed. Each characteristic adds a new physical meaning that refines the forecast. To take into account all the characteristics, the following continuous patrol observations are necessary: (1) the magnetic field of the active region (ascent of the flux) and the total magnetic field of the Sun, which can predict the onset of flare activity several days prior to main events; (2) soft X-ray radiation in two channels to calculate the temperature (T) and emission measure of plasma, which can show preheating to T > 10 MK required to begin proton acceleration (the first few minutes before the start of hard X-ray (HXR) radiation with energies >100 keV); (3) HXR radiation >100 keV or microwave radiation (>3 GHz), which indicates the intensity and duration of operation of the electron accelerator (a few to tens of minutes before the arrival of protons with energies >100 MeV); (4) radio emission at plasma frequencies (<1000 MHz), showing the development of the flare process upward into the corona and leading to a coronal mass ejection (CME) several minutes before the onset of type II and IV radio bursts (the first tens of minutes before the appearance of a CME in the field of view of the coronagraph); (5) the direction and velocity of CME propagation, which determine the conditions to release accelerated protons into the heliosphere. These stages of solar proton flares are illustrated by observations of proton events on August 2–9, 2011. To quantitatively predict the onset time, maximum and magnitude of the proton flux, as well as its fluence, it is necessary to create statistical regression models based on all of the listed characteristics of past solar proton events.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803819","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

The Substorms Impact on Processes in the Ionosphere and Plasmasphere of the Earth 次风暴对地球电离层和等离子体过程的影响

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601023

G. A. Kotova, V. L. Khalipov, A. E. Stepanov, V. V. Bezrukykh

{"title":"The Substorms Impact on Processes in the Ionosphere and Plasmasphere of the Earth","authors":"G. A. Kotova, V. L. Khalipov, A. E. Stepanov, V. V. Bezrukykh","doi":"10.1134/S0016793223601023","DOIUrl":"10.1134/S0016793223601023","url":null,"abstract":"During magnetospheric substorms in the F region of the ionosphere and up to altitudes of ~1000 km, a polarization jet (PJ) is developed. Measurements of energetic ring current ions on the AMPTE/CCE satellite and driftmeter data on the DMSP satellites evidence that the formation of PJ is associated with the injection of energetic ions (10–100 keV) into the inner magnetosphere during substorms. In the region of PJ development, the characteristics of the ionospheric plasma change: the plasma density decreases, sometimes by an order of magnitude, and at the same time, the plasma temperature increases significantly. In addition, simultaneously with the westward plasma drift, upward plasma drift is usually observed. The upward ion flux from the region of PJ development of ~109 cm–2 s–1 is an order of magnitude greater than the average daytime ion flux from the ionosphere to the plasmasphere. Measurements on the MAGION-5 satellite in the plasmasphere on the same L-shells, where the polarization jet is recorded in the ionosphere, show an increase in the cold ion density. The density “humps” observed near the plasmapause are apparently formed due to plasma flows from the ionosphere accompanying the formation of the polarization jet. Thus, the consequences of substorms are observed throughout almost the entire magnetosphere.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803776","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

Schwabe Solar Cycle in 1000–1700: Variations in Length and Amplitude 1000-1700 年的施瓦布太阳周期：长度和振幅的变化

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601102

N. G. Ptitsyna, I. M. Demina

{"title":"Schwabe Solar Cycle in 1000–1700: Variations in Length and Amplitude","authors":"N. G. Ptitsyna, I. M. Demina","doi":"10.1134/S0016793223601102","DOIUrl":"10.1134/S0016793223601102","url":null,"abstract":"One of the most significant features of solar activity is its variability in a wide range of periods with the dominance of the 11-year cycle or the Schwabe cycle. In this article, a wavelet analysis of solar activity data for 1000–1700 obtained using the number of auroras taking into account the contribution of the geomagnetic field taken into account is performed. The results show the stable presence of an 11-year cycle throughout 1000–1700. It is found that there is a systematic increase in the Schwabe cycle length in 1000–1350, after which its decrease is observed. At the same time, the length of the solar cycle increases during the Oort (13 years), Wolf (14 years), and Spörer (14–15 years) grand minima. It is established that the correlation between the amplitude and length of the solar cycle was preserved over the entire time interval of 1000–1700, but its sign changed. It is also found that the correlation between the amplitude of the cycle and the length of the previous cycle is stronger than the correlation between the amplitude and the length of the same cycle. This result is similar to what is known previously for instrumental series. However, we show that this pattern persists over a much longer time interval, and it does not depend on the sign of the correlation. The article also provides indications of the existence of solar activity variations in 1000–1550 with a period of 30–40 years.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803775","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

Forecast of Modulation of Cosmic Rays with Rigidity of 10 GV in the 25th Solar Activity Cycle 第 25 个太阳活动周期中刚度为 10 GV 的宇宙射线调制预测

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601072

V. G. Yanke, A. V. Belov, R. T. Gushchina, P. G. Kobelev, L. A. Trefilova

引用次数: 0

Identification of Possible Short-Term Ionospheric Earthquake Precursors for Seismic Events with Intermediate Hypocentrals Depths by Measuring the Standard Parameters of the Mid-Latitude Es Layer 通过测量中纬度 Es 层的标准参数，确定中等下心深度地震事件的可能短期电离层地震前兆

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601011

L. P. Korsunova, V. V. Khegai

{"title":"Identification of Possible Short-Term Ionospheric Earthquake Precursors for Seismic Events with Intermediate Hypocentrals Depths by Measuring the Standard Parameters of the Mid-Latitude Es Layer","authors":"L. P. Korsunova, V. V. Khegai","doi":"10.1134/S0016793223601011","DOIUrl":"10.1134/S0016793223601011","url":null,"abstract":"Changes in deviations from the background values of the parameters of the sporadic E ionosphere (Es) are studied: the effective (virtual) height h'Es and limiting reflection frequency (foEs). Basically, the analysis was carried based on hourly measurement data from several Japanese ground stations for vertical sounding of the ionosphere in order to identify possible short-term ionospheric earthquake precursors with intermediate (from 60 to 300 km) hypocentral depths. All known events (12 earthquakes, from 1969 to 2022) are considered for which the necessary ionospheric data in the Japan region and magnitudes (M) ranging from 6.5 to 7.6 are available. From coincidence of the maxima in changes in the considered Es characteristics on the same day at pairs of stations separated by hundreds of kilometers, the time of appearance of possible ionospheric earthquake precursors was recorded. According to the ionospheric data available during the preparation period for the studied earthquakes, a tendency has been identified according to which the time the moment of the main influence is anticipated depends on the magnitude of the impending earthquake. Similarities and differences in the responses of the ionosphere to the preparation of surface (crustal) earthquakes and earthquakes with an intermediate hypocentral depth are revealed. Another tendency is also revealed: earlier appearance of the identified earthquake precursors with increasing hypocentral depth for earthquakes with an intermediate hypocentral depth at the same distances from the epicenter to the observation point.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803946","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

Spatial Distribution of the Eddy Diffusion Coefficient in the Plasma Sheet of Earth’s Magnetotail and Its Dependence on the Interplanetary Magnetic Field and Geomagnetic Activity Based on MMS Satellite Data 基于 MMS 卫星数据的地球磁尾等离子体薄片涡扩散系数的空间分布及其与行星际磁场和地磁活动的关系

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223600996

D. Yu. Naiko, I. L. Ovchinnikov, E. E. Antonova

{"title":"Spatial Distribution of the Eddy Diffusion Coefficient in the Plasma Sheet of Earth’s Magnetotail and Its Dependence on the Interplanetary Magnetic Field and Geomagnetic Activity Based on MMS Satellite Data","authors":"D. Yu. Naiko, I. L. Ovchinnikov, E. E. Antonova","doi":"10.1134/S0016793223600996","DOIUrl":"10.1134/S0016793223600996","url":null,"abstract":"The article presents the results of a statistical analysis of the distribution of the eddy diffusion coefficient depending on the coordinates in the plasma sheet of Earth’s magnetosphere based on data from the Magnetospheric Multiscale Mission satellite system (MMS) for the period from 2017 to 2022. The localization of satellites inside the plasma sheet was recorded from the concentration and temperature of plasma ions according to the data of the same instruments and the value of plasma parameter β. Significant anisotropy of the eddy diffusion coefficient was revealed. The dependence of the eddy diffusion coefficient on the interplanetary magnetic field is analyzed, showing that with the southern orientation of the interplanetary magnetic field, the eddy diffusion coefficients are 1.5–2 times greater than with the northern orientation. It is also shown that under disturbed geomagnetic conditions (SML < –200 nT), the eddy diffusion coefficients are several times greater than under quiet geomagnetic conditions (SML > –50 nT).","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803986","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

Pitch-Angle Diffusion of Radiation Belt Electrons and Precipitating Particle Fluxes: Dependence on VLF Wavefield Parameters 辐射带电子和沉降粒子流的俯角扩散：与甚低频波场参数的关系

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601114

A. G. Demekhov

引用次数: 0

Estimation of the Influence of the Dispersion and Diffraction Properties of the Ionosphere on the Transionospheric Channel Bandwidth 估计电离层的色散和衍射特性对跨电离层信道带宽的影响

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI: 10.1134/S0016793223601059

V. P. Pashintsev, M. V. Peskov, D. A. Mikhailov, N. V. Kiselyov

{"title":"Estimation of the Influence of the Dispersion and Diffraction Properties of the Ionosphere on the Transionospheric Channel Bandwidth","authors":"V. P. Pashintsev, M. V. Peskov, D. A. Mikhailov, N. V. Kiselyov","doi":"10.1134/S0016793223601059","DOIUrl":"10.1134/S0016793223601059","url":null,"abstract":"A hardware and software complex for estimating the dispersion distortion bandwidth and fading coherence bandwidth in a satellite (transionospheric) radio channel based on the results of GPS-monitoring of the ionosphere are theoretical substantiated and developed. The basis for solving this problem is development of a structural–physical model of the radio channel, which makes it possible to simultaneously take into account the phase dispersion of the wave and diffraction on small-scale inhomogeneities of the ionosphere. Analytical dependences of the dispersion distortion bandwidth and coherence of frequency-selective fading on the mean value and small-scale fluctuations of the total electron content of the ionosphere are obtained. It is shown that under conditions of ionospheric disturbances, the fading coherence bandwidth can be much smaller than the dispersion band. In accordance with the obtained dependences, a structure is developed for building a hardware and software complex for estimating the dispersion and coherence bandwidths of a satellite radio channel based on improvement of the method for GPS monitoring of the total electron content of the ionosphere with small-scale inhomogeneities.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803825","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