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Pitch-angle anisotropy and differential rigidity spectra of cosmic rays during GLE on May 2 and 6, 1998 1998年5月2日和6日GLE期间宇宙射线的俯仰角各向异性和微分刚度谱
Solnechno-Zemnaya Fizika Pub Date : 2022-06-30 DOI: 10.12737/szf-82202204
A. Lukovnikova, V. Sdobnov
{"title":"Pitch-angle anisotropy and differential rigidity spectra of cosmic rays during GLE on May 2 and 6, 1998","authors":"A. Lukovnikova, V. Sdobnov","doi":"10.12737/szf-82202204","DOIUrl":"https://doi.org/10.12737/szf-82202204","url":null,"abstract":"Using data from the worldwide network of neutron monitors (39 stations) and the method of global spectrographic survey, we have studied pitch-angle anisotropy and differential rigidity spectra of cosmic rays during the ground level enhancements on May 2 and 6, 1998. We obtained differential rigidity spectra of solar cosmic rays in these events and determined the maximum rigidities to which protons accelerated. The maximum rigidities of accelerated protons during the ground level enhancements on May 2 was ~2.4; on May 6, ~1.8 GV. The revealed bidirectional pitch-angle anisotropy indicates that Earth was in the IMF loop structure during these events.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122414072","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
Daytime electron density at ionospheric F1-layer heights during geomagnetic storms (Irkutsk) 地磁风暴期间电离层f1层高度的日间电子密度(伊尔库茨克)
Solnechno-Zemnaya Fizika Pub Date : 2022-03-25 DOI: 10.12737/szf-81202207
G. Kushnarenko, Galina Kuznetsova, O. Yakovleva
{"title":"Daytime electron density at ionospheric F1-layer heights during geomagnetic storms (Irkutsk)","authors":"G. Kushnarenko, Galina Kuznetsova, O. Yakovleva","doi":"10.12737/szf-81202207","DOIUrl":"https://doi.org/10.12737/szf-81202207","url":null,"abstract":"We have examined variations in electron density Ne at ionospheric F1-layer heights during geomagnetic storms at the Irkutsk ionospheric station (52° N, 104° E). We have selected geomagnetic storms of varying intensity as well as quiet days for each event for the winter and summer seasons of 2003. We have analyzed the electron density in the daytime during geomagnetic storms at 150–190 km heights. Different effects of geomagnetic storms on Ne in different seasons at these heights were found. There is a slight change in the electron density during summer geomagnetic storms. On the other hand, there is an interesting effect in winter indicating the summer-winter asymmetry of the Ne response to the geomagnetic storms at these heights in 2003: in winter there is a significant influence of disturbances on Ne at a height of 190 km and a smaller effect at lower heights.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117146866","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
Results of joint observations with solar spectropolarimeter of meter range wavelengths and other instruments 与太阳分光偏振计等仪器联合观测的结果
Solnechno-Zemnaya Fizika Pub Date : 2022-03-25 DOI: 10.12737/szf-81202203
Nataliia Muratova, A. Fedotova, J. Shamsutdinova
{"title":"Results of joint observations with solar spectropolarimeter of meter range wavelengths and other instruments","authors":"Nataliia Muratova, A. Fedotova, J. Shamsutdinova","doi":"10.12737/szf-81202203","DOIUrl":"https://doi.org/10.12737/szf-81202203","url":null,"abstract":"Solar radiation is emitted in the wide frequency range from gamma to radio emission. Hence, joint observations from different instruments and frequency ranges let us to complete full representation of the evolution of solar events and confirm authenticity of data from specific instruments. In this article, we present comparative analysis data from Solar Spectropolarimeter of Meter Range wavelengths (SSMD) and other instruments. For the investigation we have chosen three solar events registered with SSMD in 2019: type III radio bursts on May 6 from 05:05 UT to 05:12 UT, type II radio bursts on May 6 from 05:12 UT to 05:19 UT, and type III radio bursts on April 14 from 05:03 UT to 05:21 UT. For comparison we apply data from the following instruments: SSMD, SRH (Siberian Radioheliograph), SDO/AIA (Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO)), Wind/WAVES (WAVES investigation on the WIND spacecraft), ground-based spectropolarimeter AMATERAS, spacecraft GOES-14. As a result, we can conclude that they are in good correlation with each other and correspond to outstanding characteristics for each event. The investigation also confirms the SSMD data authenticity.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"333 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121115055","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
The current state of the theory of Pc1 range ULF pulsations in magnetospheric plasma with heavy ions: A review 重离子磁层等离子体中Pc1范围ULF脉冲的理论研究进展
Solnechno-Zemnaya Fizika Pub Date : 2022-03-25 DOI: 10.12737/szf-81202201
O. Mikhailova, D. Klimushkin, P. Mager
{"title":"The current state of the theory of Pc1 range ULF pulsations in magnetospheric plasma with heavy ions: A review","authors":"O. Mikhailova, D. Klimushkin, P. Mager","doi":"10.12737/szf-81202201","DOIUrl":"https://doi.org/10.12737/szf-81202201","url":null,"abstract":"The review considers the current state of the theory of short-period ULF waves in plasma with admixture of heavy ions (ions whose mass significantly exceeds the mass of protons). The presence of heavy ions influences the spectrum and propagation characteristics of waves in Pc1 range. We examine elements of the theory of quasi-parallel and quasi-perpendicular short-period ULF waves. It is usually suggested that quasi-parallel ion-cyclotron waves have a left circular polarization. Quasi-perpendicular ion-ion hybrid waves have linear polarization and can be poloidal and toroidal. We discuss the theory of an equatorial resonator for Pc1 waves and determine its size from the density of heavy ions. In the radial direction, the waves can be locked in the vicinity of the plasmapause or in the region of a local minimum in the density of heavy ions. The equatorial resonator for arbitrary values of the wave vector components is considered. We note that ion-ion hybrid waves, in contrast to Alfvén waves, have a large parallel component of the magnetic field.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115120571","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: 4
Method of studying infrasound waves from thunderstorms 研究雷暴中次声波的方法
Solnechno-Zemnaya Fizika Pub Date : 2022-03-25 DOI: 10.12737/szf-81202208
A. Sorokin, V. Dobrynin
{"title":"Method of studying infrasound waves from thunderstorms","authors":"A. Sorokin, V. Dobrynin","doi":"10.12737/szf-81202208","DOIUrl":"https://doi.org/10.12737/szf-81202208","url":null,"abstract":"The paper provides an overview of studies of infrasound signals from thunderstorms over a period of more than 30 years. We deal with several types of infrasound signals from thunderstorms detected at the ISTP SB RAS infrasound station Badary in Buryatia. Special attention is paid to signals arising during the rarefaction phase. A mechanism for generating signals of this type by converting the energy of the electrostatic field into fluctuations in the pressure field was proposed by Dessler in 1973. We propose a method for identifying thunderstorm infrasound signals of various types: 1 — signals from an expanding thermal lightning channel; 2 — signals with an electrostatic generation mechanism. Using infrasound signals recorded earlier at the station in Buryatia as an example, we discuss the validity of the thunderstorm cloud model and assess some parameters of the thunderstorm source of infrasound.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125943563","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
Small solar flares and local polarity inversion lines of the longitudinal magnetic field of the active region 小太阳耀斑和局部极性倒转线的纵向磁场活跃区
Solnechno-Zemnaya Fizika Pub Date : 2022-03-25 DOI: 10.12737/szf-81202202
A. Borovik, A. Zhdanov
{"title":"Small solar flares and local polarity inversion lines of the longitudinal magnetic field of the active region","authors":"A. Borovik, A. Zhdanov","doi":"10.12737/szf-81202202","DOIUrl":"https://doi.org/10.12737/szf-81202202","url":null,"abstract":"Using photospheric data and data on the longitudinal magnetic field from the SDO satellite, as well as observations in the Hα line from GONG ground stations, we have studied the flare activity of the NOAA 12673 sunspot group, which in September 2017 produced the largest X9.3 class flare in the last decade. The active region was distinguished by rapid development, complex topology, and magnetic field dynamics. We have established that in the active region almost throughout the development period due to movements of diverse polar magnetic fluxes and their convergence, numerous local polarity inversion lines (LPIL) of the magnetic field were formed. Small solar flares have been found to be closely related to LPIL and to occur in those areas of LPIL where the gradient of the longitudinal magnetic field over time reaches maximum values.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132150716","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
Calibration of Siberian Radioheliograph antenna gains using redundancy 利用冗余校正西伯利亚射电日像仪天线增益
Solnechno-Zemnaya Fizika Pub Date : 2021-12-20 DOI: 10.12737/szf-74202111
M. Globa, S. Lesovoi
{"title":"Calibration of Siberian Radioheliograph antenna gains using redundancy","authors":"M. Globa, S. Lesovoi","doi":"10.12737/szf-74202111","DOIUrl":"https://doi.org/10.12737/szf-74202111","url":null,"abstract":"The paper describes application of standard gain calibration using redundancy for a 48-antenna prototype of Siberian Radioheliograph. Traditionally, for calibration, the visibilities were measured only between adjacent antennas since they have the highest signal-to-noise ratio and are sufficient for phase calibration. We have shown that this limited set of visibilities did not allow using the antenna array redundancy potential and obtaining images with a high dynamic range on a permanent basis. Images without amplitude calibration contain many artifacts and require special care when analyzed. The inclusion of visibility measurement between antennas with a double step made it possible to significantly increase the accuracy of solving the system of equations for amplitudes. Images constructed using both phase and amplitude calibrations do not have visible artifacts and are more reliable.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123448513","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
Relationship between geomagnetic storm development and the solar wind parameter β 地磁风暴发展与太阳风参数β的关系
Solnechno-Zemnaya Fizika Pub Date : 2021-12-20 DOI: 10.12737/szf-74202104
N. Kurazhkovskaya, O. Zotov, B. Klain
{"title":"Relationship between geomagnetic storm development and the solar wind parameter β","authors":"N. Kurazhkovskaya, O. Zotov, B. Klain","doi":"10.12737/szf-74202104","DOIUrl":"https://doi.org/10.12737/szf-74202104","url":null,"abstract":"We have analyzed the dynamics of solar wind and interplanetary magnetic field (IMF) parameters during the development of 933 isolated geomagnetic storms, observed over the period from 1964 to 2010. The analysis was carried out using the epoch superposition method at intervals of 48 hrs before and 168 hrs after the moment of Dst minimum. The geomagnetic storms were selected by the type of storm commencement (sudden or gradual) and by intensity (weak, moderate, and strong). The dynamics of the solar wind and IMF parameters was compared with that of the Dst index, which is an indicator of the development of geomagnetic storms. The largest number of storms in the solar activity cycle is shown to occur in the years of minimum average values (close in magnitude to 1) of the solar wind parameter β (β is the ratio of plasma pressure to magnetic pressure). We have revealed that the dynamics of the Dst index is similar to that of the β parameter. The duration of the storm recovery phase follows the characteristic recovery time of the β parameter. We have found out that during the storm main phase the β parameter is close to 1, which reflects the maximum turbulence of solar wind plasma fluctuations. In the recovery phase, β returns to background values β~2‒3.5. We assume that the solar wind plasma turbulence, characterized by the β parameter, can play a significant role in the development of geomagnetic storms.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116710965","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
Studying auroral activity using the SME index at the magnetic storm main phase during CIR and ICME events 利用SME指数研究CIR和ICME磁暴主阶段的极光活动
Solnechno-Zemnaya Fizika Pub Date : 2021-12-20 DOI: 10.12737/szf-74202103
R. Boroev, M. Vasiliev
{"title":"Studying auroral activity using the SME index at the magnetic storm main phase during CIR and ICME events","authors":"R. Boroev, M. Vasiliev","doi":"10.12737/szf-74202103","DOIUrl":"https://doi.org/10.12737/szf-74202103","url":null,"abstract":". In this paper, we examine the relationship of the SME index with magnetic storm characteristics and interplanetary medium parameters during the main phase of magnetic storms caused by CIR and ICME events. Over the period 1990–2017, 107 magnetic storms driven by (64) CIR and (43) ICME events have been selected. In contrast to AE and Kp, a stronger correlation is shown to exist between the average SME index (SMEaver) and interplanetary medium parameters during the magnetic storm main phase. Close correlation coefficients between SMEaver and the SW electric field (southward IMF Bz) have been obtained for CIR and ICME events. SMEaver has been found to increase with the rate of magnetic storm development and |Dstmin|. For CIR and ICME events, no difference has been revealed between SMEaver and |Dstmin| in linear regression equations.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122705914","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: 1
Complexes of activity on the Sun in solar cycle 21 第21太阳周期太阳活动的复合体
Solnechno-Zemnaya Fizika Pub Date : 2021-12-20 DOI: 10.12737/szf-74202101
S. Yazev, M. Ulianova, E. Isaeva
{"title":"Complexes of activity on the Sun in solar cycle 21","authors":"S. Yazev, M. Ulianova, E. Isaeva","doi":"10.12737/szf-74202101","DOIUrl":"https://doi.org/10.12737/szf-74202101","url":null,"abstract":"The paper provides statistical data on solar activity complexes (ACs) observed in solar cycle 21. From the synoptic charts for the 1976–1986 sunspot activity, we have detected the regions where the sunspot generation was observed at least through three Carrington Rotations (CRs). These regions were identified as AC cores. We have compiled an AC catalogue. ACs are shown to evolve quasi-periodically, in pulses that are 15–20 rotations long. We have analyzed the North-South asymmetry in the AC location. In cycle 21, 90 % of the proton flares that affected the natural environment are shown to have occurred in ACs. We note a tendency for AC activity to decrease, as well as the manifestation of the Gnevyshev—Ohl rule in AC properties, in solar cycles 21–24.","PeriodicalId":351867,"journal":{"name":"Solnechno-Zemnaya Fizika","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123911658","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: 2
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