Solnechno-Zemnaya Fizika最新文献_第2页

Active longitudes and the structure of the large-scale magnetic field at solar minimum 太阳最小值时的活动经度和大尺度磁场结构

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202303

Victor Grigoryev, Lyudmila Ermakova

引用次数: 0

Ionospheric longitudinal variability in the Northern Hemisphere during magnetic storms in March 2012 from ionosonde and GPS/GLONASS data 根据电离层探测仪和全球定位系统/全球轨道导航卫星系统数据得出的 2012 年 3 月磁暴期间北半球电离层纵向变化情况

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202313

Marina Chernigovskaya, A. Yasyukevich, D. Khabituev

{"title":"Ionospheric longitudinal variability in the Northern Hemisphere during magnetic storms in March 2012 from ionosonde and GPS/GLONASS data","authors":"Marina Chernigovskaya, A. Yasyukevich, D. Khabituev","doi":"10.12737/szf-94202313","DOIUrl":"https://doi.org/10.12737/szf-94202313","url":null,"abstract":"A comprehensive study of spatio-temporal variations of geomagnetic, ionospheric, and atmospheric parameters in the middle and high latitudes of the Northern Hemisphere during a series of magnetic storms in March 2012 has been expanded by including vertical total electronic content (TEC) data from measurements at the chains of dual-frequency phase receivers GPS/GLONASS in the analysis. The features of longitudinal variations in ionosphere ionization over mid-latitude Eurasia, found earlier from vertical sounding data, are confirmed by vertical TEC data. We emphasize the complex physics of the long magnetically disturbed period in March 2012 with switching between positive and negative effects of an ionospheric storm during the same magnetic storm phases for spaced mid-latitude regions of the Eastern Hemisphere. Such changes in the ionospheric storm effects might have been caused by the superposition of competing processes in the mid-latitude region of the Eastern Hemisphere due to variations in the thermospheric composition, thermospheric winds, and large-scale electric fields affecting ionospheric ionization. We have observed significant differences in the nature of the ionospheric ionization reaction between the Eastern and Western hemispheres to the prolonged geomagnetic disturbance in March 2012. According to TEC data, there was an effect of reduced ionization of the ionosphere at longitudes of the Western Hemisphere, unlike the Eastern one. The effect of a negative ionospheric storm was caused by the formation of vast areas of atmospheric gas with a reduced density ratio [O]/[N2] over the mid-latitude region of the Western Hemisphere in the zone of maximum penetration of geomagnetic disturbances from high latitudes to middle latitudes. According to the INTERMAGNET magnetometer chain data for the analyzed period of magnetic storms on March 7–20, 2012, at midlatitudes of the Northern Hemisphere the maximum geomagnetic field variations were observed in the Western Hemisphere.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"130 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138953644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of the magnetic field and the mean flow configuration on spatial structure and growth rate of normal modes 磁场和平均流形对法线模式空间结构和增长率的影响

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202315

Vladimir Mordvinov, Elena Devyatova, Vladimir Tomozov

{"title":"Influence of the magnetic field and the mean flow configuration on spatial structure and growth rate of normal modes","authors":"Vladimir Mordvinov, Elena Devyatova, Vladimir Tomozov","doi":"10.12737/szf-94202315","DOIUrl":"https://doi.org/10.12737/szf-94202315","url":null,"abstract":"The first part of the work presents the results of numerical experiments with the magnetohydrodynamic model of “shallow water” to assess the degree of influence of the magnetic field on the development of instabilities conditioned by a combination of inhomogeneities in the mean flow and the mean magnetic field. Numerical simulation of normal modes has confirmed the earlier obtained result on the different influence of weak and strong magnetic fields on the instability of differential rotation. Calculations have shown that a weak magnetic field stabilizes the development of instabilities, whereas a strong magnetic field, on the contrary, enhances the instability. Azimuthal inhomogeneities of differential rotation in all cases contribute to the development of instabilities. In the second part of the work, we examine the spatial structure of normal modes and make an attempt to interpret the torsional oscillations observed in the atmospheres of Earth and the Sun. Calculations have shown that regular axisymmetric disturbances (torsional oscillations) can be caused by the formation of a cyclonic vortex above the pole, which is characteristic of Earth’s atmosphere and, possibly, of the Sun’s atmosphere. The least damped normal mode of a stable polar cyclone has a structure of torsional oscillations. Flow anomalies and the development of an anticyclonic eddy in winter at midlatitudes destroy torsional oscillations and lead to a rapid amplification of normal modes, which are more complex in structure.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"97 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodetachment rates for O⁻ and O₂⁻ in the D layer of the ionosphere as function of solar zenith angle and solar activity 电离层 D 层 O- 和 O₂- 的光脱离率与太阳天顶角和太阳活动的函数关系

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202312

Stanislav Kozlov, Andrey Lyakhov

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Main statistical properties of hectometric continuum radiation in near-Earth space 近地空间八度连续辐射的主要统计特性

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202308

D. Dorofeev, Aleksandr Chernyshov, D. Chugunin, Michael Mogilevsky

引用次数: 0

Solar flares with sustained gamma-ray emission and some characteristics of high-energy proton fluxes 持续发射伽马射线的太阳耀斑和高能质子通量的一些特征

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202304

Vladimir Tomozov, G. Minasyants, T. Minasyants

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Fifty years of studying the GCR intensity during inversion of heliospheric magnetic fields I. Observations 研究日光层磁场反转过程中的 GCR 强度五十年 I. 观测结果

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202301

Mikhail Krainev, Galina Bazilevskaya, Mikhail Kalinin, Vladimir Mihaylov, A. Svirzhevskaya, Nikolay Svirzhevsky

{"title":"Fifty years of studying the GCR intensity during inversion of heliospheric magnetic fields I. Observations","authors":"Mikhail Krainev, Galina Bazilevskaya, Mikhail Kalinin, Vladimir Mihaylov, A. Svirzhevskaya, Nikolay Svirzhevsky","doi":"10.12737/szf-94202301","DOIUrl":"https://doi.org/10.12737/szf-94202301","url":null,"abstract":"The effects of the 22-year variation of solar magnetic fields in the galactic cosmic ray (GCR) intensity were first observed and interpreted as manifestations of inversion of the high-latitude solar magnetic field in properties of heliospheric magnetic fields by the Lebedev Physical Institute team in 1973. Since then, these effects have been studied already for 50 years. \u0000The situation with the heliospheric magnetic field is clear for periods of medium and low sunspot activity — the heliosphere consists of two unipolar “hemispheres” separated by a wavy global heliospheric current sheet and characterized by a general polarity A (unit quantity with the sign of the radial component of the heliospheric magnetic field in the northern hemisphere). Yet there is no consensus on what the inversion of the heliospheric magnetic field is and which effects in the GCR intensity are connected with this phenomenon. \u0000In this article, we briefly formulate general concepts of the 22-year variation in characteristics of the Sun, heliosphere, and GCR intensity and discuss the observed effects in the GCR intensity, which we attribute to the heliospheric magnetic field reversal. Models for this phenomenon and the results of GCR intensity calculations with these models will be discussed in the next article.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"113 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138953903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics of small-scale magnetic fields before small and large solar flares 小型和大型太阳耀斑前的小尺度磁场动力学

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202305

A. Borovik, A. Zhdanov

引用次数: 0

Polarization distribution of transverse ULF waves according to Van Allen Probe A data: whether toroidal and poloidal waves exist separately in the magnetosphere? 根据范艾伦探测器 A 数据得出的超低频横波极化分布：磁层中是否分别存在环形波和极性波？

Solnechno-Zemnaya Fizika Pub Date : 2023-12-20 DOI: 10.12737/szf-94202309

Artur Yakimchuk, Aleksander V. Rubtsov, D. Klimushkin

{"title":"Polarization distribution of transverse ULF waves according to Van Allen Probe A data: whether toroidal and poloidal waves exist separately in the magnetosphere?","authors":"Artur Yakimchuk, Aleksander V. Rubtsov, D. Klimushkin","doi":"10.12737/szf-94202309","DOIUrl":"https://doi.org/10.12737/szf-94202309","url":null,"abstract":"Ultralow-frequency (ULF) waves play an important role in energy transfer within Earth's magnetosphere due to intensive interaction with the surrounding plasma. Previous works have assumed that these waves are strictly divided by polarization into toroidal, when the magnetic field oscillates in the azimuthal direction, and poloidal, when it oscillates in the radial direction. The former are azimuthally large-scale and are excited by external sources, whereas the latter are small-scale and are generated by internal plasma instabilities. Observations show, however, that waves of mixed polarization often occur, and the nature of this mixing has not been explained. In this paper, we carry out a statistical study and show that the polarization of transverse waves has a normal distribution, and the maximum corresponds to oscillations of the toroidal and poloidal components with the same amplitude. At the same time, the spatial distributions of toroidal and poloidal waves are clearly different, but only lead to a small shift in the position of the distribution maximum. This result suggests that in order to compare the theory with ULF wave observations it is necessary to take into account the processes of polarization change, which can affect wave-particle interactions in the magnetosphere.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"14 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139168472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Peculiarities of medium parameter dynamics and cosmic ray density in strong Forbush decreases associated with magnetic clouds 强磁云中介质参数动力学和宇宙射线密度的特性

Solnechno-Zemnaya Fizika Pub Date : 2023-06-29 DOI: 10.12737/szf-92202311

A. Petukhova, Ivan Petuhov, S. Petukhov, Ilya Gotovtsev

{"title":"Peculiarities of medium parameter dynamics and cosmic ray density in strong Forbush decreases associated with magnetic clouds","authors":"A. Petukhova, Ivan Petuhov, S. Petukhov, Ilya Gotovtsev","doi":"10.12737/szf-92202311","DOIUrl":"https://doi.org/10.12737/szf-92202311","url":null,"abstract":"Diffusion and electromagnetic mechanisms determine the formation of sporadic Forbush decreases. The diffusion mechanism affects the Forbush decrease amplitude in the turbulent layer, and the part of the coronal mass ejection preceding the magnetic cloud, and its efficiency depends on the level of magnetic field turbulence. The electromagnetic mechanism works in a magnetic cloud, and its efficiency depends on the intensity of regular magnetic and electric fields. We analyze solar wind parameters and cosmic ray density, using the superposed epoch analysis. In 1996–2006, 23 strong Forbush decreases (amplitude >5 %) were detected. The average amplitude of 7 % is equally formed by both mechanisms. The events can be divided into 2 groups depending on the contribution of the mechanisms to Forbush decrease amplitude. Group 1 includes the strongest Forbush decreases (amplitude=8.5 %), formed by both diffusion and electromagnetic mechanisms. The diffusion mechanism forms 0.26 amplitude, and the electromagnetic mechanism is responsible for 0.74 one. In group 2, the averege amplitude Forbush decrease =5.7 %, the diffusion mechanism forms 0.79 of amplitude; and the electromagnetic one, 0.21. The spatial distributions of the mean values of the medium parameters in the region of disturbances in the groups differ. This difference can be explained by the fact that Forbush decrease amplitude in groups 1 and 2 are formed in the central and peripheral parts of coronal mass ejection respectively.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115280171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0