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Quiet solar corona: daily images at 8.8–10.7 cm wavelengths 安静的日冕:8.8-10.7厘米波长的每日图像
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202308
Alexander Altyntsev, Mariia Globa, Nataliya Meshalkina
{"title":"Quiet solar corona: daily images at 8.8–10.7 cm wavelengths","authors":"Alexander Altyntsev, Mariia Globa, Nataliya Meshalkina","doi":"10.12737/stp-92202308","DOIUrl":"https://doi.org/10.12737/stp-92202308","url":null,"abstract":"We discuss results of test observations of the 3–6 GHz range array of the Siberian Radio Heliograph (SRH). A method for calibrating brightness temperatures of images was verified using measurements of the brightness temperature of the quiet Sun at a minimum between solar activity cycles 20 and 21 known in the literature. The obtained time dependences of the integral solar flux at 2.8 GHz are similar to those measured at the Dominion Radio Astrophysical Observatory (DRAO), but the absolute values of SRH fluxes are lower relative to the DRAO fluxes by 10–15 %.
 The spectral density of the solar microwave flux at a frequency of 2.8 GHz, the so-called F10.7 index, is one of the main solar activity indices used as input parameters in models of Earth’s ionosphere. The paper considers the relationship between total radio fluxes and changes in the structure of sources on the solar disk during an interval of 50 days. During the period of daily observations from September 1 to October 20, 2021, the number of active regions on the disk changed several times, and the integral flux density at 2.8 GHz changed up to 1.5 times. We determine the relative contributions to the integral flux of bremsstrahlung of near-limb brightenings and plage regions, as well as bremsstrahlung in magnetic fields of active regions. The measured brightness temperatures of SRH radio maps are compared to the model temperatures calculated from observations of extreme ultraviolet emission (EUV) with the AIA/SDO telescope. The results of the analysis can be used to organize regular measurements of the corrected solar activity proxy index F10.7 at SRH, in which the contribution of gyroresonance emission is excluded.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"307 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":"135100120","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
Effects of 7September 5–12, 2017 solar flares on regional disturbance of Earth’s ionosphere as recorded by GNSS stations located in the Volga Federal District of the Russian Federation 俄罗斯联邦伏尔加联邦区GNSS站记录的2017年9月7日至12日太阳耀斑对地球电离层区域扰动的影响
IF 1.1
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202306
D. Maksimov, D. Kogogin, I. Nasyrov, R. Zagretdinov
{"title":"Effects of 7September 5–12, 2017 solar flares on regional disturbance of Earth’s ionosphere as recorded by GNSS stations located in the Volga Federal District of the Russian Federation","authors":"D. Maksimov, D. Kogogin, I. Nasyrov, R. Zagretdinov","doi":"10.12737/stp-92202306","DOIUrl":"https://doi.org/10.12737/stp-92202306","url":null,"abstract":"The paper presents the results of estimation of the effects of September 5–12, 2017 solar flares on the regional disturbance of Earth's ionosphere according to data from a distributed network of GNSS stations located mostly in the Volga Federal District of the Russian Federation. The GNSS data processing software package we have developed is used to analyze recorded signal power and daily two-frequency phase measurements, as well as to calculate the total electron content and map the data. The results of the study show that during powerful solar flares X2.2 and X9.3 on September 6 the median value of the total electron content, calculated for the Volga Federal District, increased up to 0.25 TECU and 0.6 TECU respectively. At that time, the region of interest (40°–55° E) was sunlit. The prolonged magnetic storms on September 8 also generated noticeable ionospheric disturbances up to 0.2 TECU. At the same time, neither the solar flares nor the magnetic storms had a significant effect on the power characteristics of the recorded signals from navigation satellites in the region under study. The median carrier-to-noise ratio calculated for the region considered over the entire observation period did not differ from the values recorded under undisturbed ionospheric conditions and varied between 47–53 dBHz and 38–49 dBHz for frequencies L1 and L2 respectively.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47461132","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
Variations in cosmic ray cutoff rigidities during the March 8–11, 2012 magnetic storm (CAWSES II period) 2012年3月8日至11日磁暴期间宇宙线截止刚度的变化（CAWSES II期）
IF 1.1
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202310
O. Danilova, N. Ptitsyna, M. Tyasto, V. Sdobnov
{"title":"Variations in cosmic ray cutoff rigidities during the March 8–11, 2012 magnetic storm (CAWSES II period)","authors":"O. Danilova, N. Ptitsyna, M. Tyasto, V. Sdobnov","doi":"10.12737/stp-92202310","DOIUrl":"https://doi.org/10.12737/stp-92202310","url":null,"abstract":"The geomagnetic cutoff rigidity of cosmic rays (CRs) is the main factor regulating the arrival of CR particles at a given point on Earth's surface or inside the magnetosphere. To study the relationship between cutoffs and near-Earth space parameters, we have selected the strongest magnetic storm that occurred on March 8–11, 2012 during the CAWSES-II interval, recommended by SCOSTEP for detailed studies of solar-terrestrial relations. We have found the geomagnetic cutoffs by two methods: 1) by trajectory calculations in the magnetic field of the perturbed magnetosphere according to the Ts01 model and 2) by the spectrographic global survey method according to the data from the world network of neutron monitors. The largest drop in the cutoffs (−1.1 GV) obtained by the latter method was observed during the recovery phase of the storm. Apparently, this is due to the influence of the supersubstorms that occurred at that time. The analysis has shown that the closest connection of variations in the cutoffs can be traced with the geomagnetic activity index Dst, which indicates the determining contribution of the ring current to the transport of CRs. In addition, we have found a significant connection with the electromagnetic field parameters (with the Bz component of the interplanetary magnetic field and the azimuthal component of the electric field Ey). The dynamic solar wind parameters practically do not control variations in CR geomagnetic cutoff rigidities.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45736787","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
CAII lines in a quiet region on the Sun I. Dynamic processes in the solar atmosphere 太阳上一个安静区域的CAII线I.太阳大气中的动力学过程
IF 1.1
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202302
I. Turova, S. Grigoryeva, O. Ozhogina
{"title":"CAII lines in a quiet region on the Sun I. Dynamic processes in the solar atmosphere","authors":"I. Turova, S. Grigoryeva, O. Ozhogina","doi":"10.12737/stp-92202302","DOIUrl":"https://doi.org/10.12737/stp-92202302","url":null,"abstract":"We have studied oscillation processes in the quiet Sun outside a coronal hole at different levels of the solar chromosphere. The study was based on spectroscopic observations of ionized calcium lines (K, H, and 849.8 nm) obtained by the Sayan Solar Observatory’s Automated Solar Telescope (AST). Spectral analysis of time series for some parameters of the lines has been carried out. We have compared the results of this work with the results of our study of oscillation processes in quiet regions located at the base of a coronal hole. The oscillation power was found to be higher in the region of the quiet Sun outside a coronal hole. At the same time, for the regions under study there is a common tendency for the oscillation power to decrease with height for all frequency ranges, except for the low-frequency one, in most chromospheric structures. In structures with a weak magnetic field, the power increases with height to the lower chromosphere and decreases somewhat to the upper chromosphere.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47676113","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
Latitudinal distribution of solar microflares and high-temperature plasma at solar minimum 太阳微耀斑和高温等离子体在太阳极小期的纬度分布
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202301
Aleksey Kirichenko, Ivan Loboda, Anton Reva, Artyom Ulyanov, Sergey Bogachev
{"title":"Latitudinal distribution of solar microflares and high-temperature plasma at solar minimum","authors":"Aleksey Kirichenko, Ivan Loboda, Anton Reva, Artyom Ulyanov, Sergey Bogachev","doi":"10.12737/stp-92202301","DOIUrl":"https://doi.org/10.12737/stp-92202301","url":null,"abstract":"The paper analyzes the latitudinal distribution of high-temperature plasma (T>4 MK) and microflares on the solar disk during low solar activity in 2009. The distribution of A0.1–A1.0 microflares contains belts typical of ordinary flares of B class and higher. In total, we have registered 526 flares, most of which, about 96 %, occurred at high latitudes. About 4 % of microflares were found near the solar equator. We believe that they were formed by the residual magnetic field of previous solar cycle 23. Ordinary flares were almost not observed near the equator during this period. The number of microflares in the southern hemisphere was slightly higher than in the northern one. This differs from the distribution of ordinary flares for which the northern hemisphere was previously reported to be dominant.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"40 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":"135099920","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
Differences in the response to CME and CIR drivers of geomagnetic disturbances 地磁扰动对CME和CIR驱动响应的差异
IF 1.1
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202304
B. Namuun, B. Tsegmed, L. Li, G. M. Leghari
{"title":"Differences in the response to CME and CIR drivers of geomagnetic disturbances","authors":"B. Namuun, B. Tsegmed, L. Li, G. M. Leghari","doi":"10.12737/stp-92202304","DOIUrl":"https://doi.org/10.12737/stp-92202304","url":null,"abstract":"Utilizing 1-minute resolution data on the geomagnetic indices SYM-H, AE, solar wind parameters (velocity Vsw and density Np), and z-component Bz of the interplanetary magnetic field (IMF) during solar cycles 23 and 24, we have statistically analyzed the correlations between geomagnetic activity (storms and substorms), Vsw, Np, Bz, and energy coupling functions of solar wind and Earth’s magnetosphere. For the selected 131 CME-driven storms, SYM-H stronger depends on Vsw and B than other parameters, whereas the selected 161 CIR-driven storms have nearly the same dependence on the solar wind electric field, the rate of open magnetic flux dφ/dt, and the reconnection electric field Ekl. Thus, the solar wind electric field and the dayside magnetic reconnection are likely to have different contributions for storms of the two types. During storms of different types, the substorm intensity AE relies mainly on the IMF Bz, rate of open magnetic flux and reconnection electric field.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48390640","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
Precipitation-related increase events of the electromagnetic component of secondary cosmic rays: Spectral analysis 二次宇宙射线电磁成分与降水有关的增加事件:光谱分析
IF 1.1
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202305
Yuriy V. Balabin, A. Germanenko, B. Gvozdevsky, E. Maurchev, E. Mikhalko
{"title":"Precipitation-related increase events of the electromagnetic component of secondary cosmic rays: Spectral analysis","authors":"Yuriy V. Balabin, A. Germanenko, B. Gvozdevsky, E. Maurchev, E. Mikhalko","doi":"10.12737/stp-92202305","DOIUrl":"https://doi.org/10.12737/stp-92202305","url":null,"abstract":"We report the measurement results of differential spectra of electromagnetic radiation in the range 0.1–4 MeV, which occurs in the atmosphere as a component of secondary cosmic rays. Spectral monitoring was performed using a spectrometer based on the Nai (TL) crystal in 2022–2023. The main purpose of the measurements was to determine spectral characteristics of the electromagnetic radiation during increase events, when the electromagnetic radiation flux from the atmosphere rises by tens of percent with respect to the background level. From a thorough analysis of the spectra of many dozens of events, we have drawn a conclusion that although the lines of natural radionuclides are present on the spectra and contribute their share, their total contribution to the increase events is ~0.1 of the total energy supplied during an increase. We unambiguously conclude that the effect of increasing electromagnetic radiation during precipitation is not due to the presence of radionuclides in precipitation.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46850033","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
Local diagnostics of aurora presence based on intelligent analysis of geomagnetic data 基于地磁数据智能分析的极光局部诊断
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202303
Andrey Vorobev, Anatoly Soloviev, Vyacheslav Pilipenko, Gulnara Vorobeva, Aliya Gainetdinova, Aleksandr Lapin, Vladimir Belahovskiy, Alexey Roldugin
{"title":"Local diagnostics of aurora presence based on intelligent analysis of geomagnetic data","authors":"Andrey Vorobev, Anatoly Soloviev, Vyacheslav Pilipenko, Gulnara Vorobeva, Aliya Gainetdinova, Aleksandr Lapin, Vladimir Belahovskiy, Alexey Roldugin","doi":"10.12737/stp-92202303","DOIUrl":"https://doi.org/10.12737/stp-92202303","url":null,"abstract":"Despite the existing variety of approaches to monitoring space weather and geophysical parameters in the auroral oval region, the issue of effective prediction and diagnostics of auroras as a special state of the upper ionosphere at high latitudes remains virtually unresolved.
 In this paper, we explore the possibility of local diagnostics of auroras through mining of geomagnetic data from ground-based sources. We assess the significance of indicative variables and their statistical relationship.
 So, for example, the application of Bayesian inference to the data from the Lovozero geophysical station for 2012–2020 has shown that the dependence of a posteriori probability of observing auroras in the optical range on the state of geomagnetic parameters is logarithmic, and the degree of its significance is inversely proportional to the discrepancy between empirical data and approximating function.
 The accuracy of the approach to diagnostics of aurora presence based on the random forest method is at least 86 % when using several local predictors and ~80 % when using several global geomagnetic activity indices characterizing the geomagnetic field disturbance in the auroral zone.
 In conclusion, we discuss promising ways to improve the quality metrics of diagnostic models and their scope.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"7 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":"134997434","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
Ionospheric electric potential as an alternative indicator of solar effect on the lower atmosphere 电离层电势作为太阳对低层大气影响的替代指标
IF 1.1
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202313
Ashkhen Karahanyan, S. Molodykh
{"title":"Ionospheric electric potential as an alternative indicator of solar effect on the lower atmosphere","authors":"Ashkhen Karahanyan, S. Molodykh","doi":"10.12737/stp-92202313","DOIUrl":"https://doi.org/10.12737/stp-92202313","url":null,"abstract":"We have explored the possibility of applying the ionospheric electric potential (EP) as a parameter describing the effects of solar activity on the troposphere. We calculated EP, using the semi-empirical model, where the potential spatial distribution is determined by solar wind, interplanetary magnetic field parameters, and the geomagnetic activity index AL. We have carried out a comparative analysis of EP and the commonly used geomagnetic activity indices in a high-latitude region for 1975–2019. It has been shown that EP can be used as an indicator of solar activity since it describes both short-period disturbances and long-term variations. The revealed similar trends in long-term EP variations and near-surface temperature suggest that the changes in climate system parameters are induced by slower changes in the Sun’s large-scale magnetic field. The performed analysis of EP and near-surface temperature correlation maps has revealed that the atmospheric static stability conditions have an effect on spatial distribution of tropospheric response to solar impact.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44587568","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
Temperature effect of muons registered under the ground in Yakutsk by telescopes on GAS-discharge counters 用气体放电计数器上的望远镜在雅库茨克地下记录的μ子的温度效应
Solar-Terrestrial Physics Pub Date : 2023-06-29 DOI: 10.12737/stp-92202307
Valery Yanchukovsky
{"title":"Temperature effect of muons registered under the ground in Yakutsk by telescopes on GAS-discharge counters","authors":"Valery Yanchukovsky","doi":"10.12737/stp-92202307","DOIUrl":"https://doi.org/10.12737/stp-92202307","url":null,"abstract":"The Yakutsk spectrograph of cosmic rays includes a complex of muon telescopes based on gas-discharge and scintillation counters located on the surface and under the ground at depths of 7, 20, and 40 m.w.e. Using continuous observations made by muon telescopes on gas-discharge counters and data on the altitude profile of the atmospheric temperature over Yakutsk for the period from January 2016 to December 2018, we have calculated density distributions of temperature coefficients for muons detected on the surface and at various depths under the ground. To do this, we employed multivariate regression methods and principal component methods. The results obtained are compared with the results of earlier theoretical calculations. The results make it possible to correctly take into account the temperature effect in the data from the complex of muon telescopes on gas-discharge counters.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"1 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":"135099934","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
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