Geomagnetism and Aeronomy最新文献_第9页

Asymmetry of the Ionosphere Variability in the North and South Auroral Zones at the Extreme Geomagnetic AE and Apo Indices 极端地磁AE和Apo指数对南北极光区电离层变化的不对称性

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700130

T. L. Gulyaeva

{"title":"Asymmetry of the Ionosphere Variability in the North and South Auroral Zones at the Extreme Geomagnetic AE and Apo Indices","authors":"T. L. Gulyaeva","doi":"10.1134/S0016793224700130","DOIUrl":"10.1134/S0016793224700130","url":null,"abstract":"Differences in geomagnetic and ionospheric activity are investigated for the maximum monthly–hourly values of the auroral electrojet AE index, measured on a network of magnetometers above 60° in the Northern hemisphere from 1995 to 2019. The selected extreme AE indices were compared with the time–matched 1-h Apo indices observed in the sub-auroral zone from 1995 to the present. A high correlation of 300 selected values of AE and Apo indices (cc = 0.69) was obtained for the period of their synchronous observations in 1995–2019. For a comparison, variations of the ionospheric zonal dispersion (Net Volume, NT) are considered designating the difference between the positive and negative deviations of TEC from the quiet state in the selected zone. The NT is produced from TEC-based W-index values at the grid in the auroral zones of the Northern and Southern hemispheres for the geomagnetic latitudes exceeding ±60°. The NT values were estimated from JPL maps of the total electron content, GIM–TEC, and the corresponding W-index maps converted from geographic to geomagnetic coordinates. We observed an asymmetry of the ionospheric variability in the Northern and Southern auroral zones with the dominance of the positive (negative) NT values in the local winter (summer). At the same time, the seasonal variation of the geomagnetic AE and Apo indices recorded mainly in the Northern Hemisphere shows changes similar to the ionospheric variations of NT in the Southern Hemisphere with a decrease in the amplitude by the winter solstice. The analytical dependences of NT indices on the day of year in the North and South auroral zones were derived suitable for estimating the ionospheric variability in the operational forecasting models of the ionosphere.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 7","pages":"1080 - 1088"},"PeriodicalIF":0.7,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995025","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

Formation of Near-Surface Magnetic Fields of the Sun 太阳近表面磁场的形成

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700269

A. G. Tlatov, I. A. Berezin, K. A. Tlatova

{"title":"Formation of Near-Surface Magnetic Fields of the Sun","authors":"A. G. Tlatov, I. A. Berezin, K. A. Tlatova","doi":"10.1134/S0016793224700269","DOIUrl":"10.1134/S0016793224700269","url":null,"abstract":"In this work, we studied the formation of a large-scale magnetic field. For this, we used the surface flux transport (SFT) model. We have studied the model’s accuracy and its sensitivity to uncertainties in its key parameters and input data. We also compared the simulated magnetic field with observations of the SDO/HMI and STOP/Kislovodsk magnetic fields. Overall there is good agreement between the simulations and observations. Although the model cannot reproduce fine details of the magnetic field, the long-term evolution of the polar field is very similar in simulations and observations. During even one activity cycle, large-scale field drift waves to high latitudes change polarity. Magnetic field drift waves, the sign of which corresponds to the magnetic polarity of the trailing parts of the active regions, often exist during the decline phase of activity. This does not quite correspond to the idea of mutual compensation of the leading fields of active regions across the equator. We also looked at the magnetic field flux across the equator. We confirmed that the flux across the equator does not show a clear predominance of leading sunspot polarity. The results are discussed to test dynamo models.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 7","pages":"1176 - 1181"},"PeriodicalIF":0.7,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994943","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

Variations in the Solar Wind Velocity of the Daily Range (Microstreams) in the Near-Earth Space and Remote Areas of the Heliosphere 近地空间和遥远日球层太阳风日范围（微流）的变化

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700129

D. V. Erofeev

{"title":"Variations in the Solar Wind Velocity of the Daily Range (Microstreams) in the Near-Earth Space and Remote Areas of the Heliosphere","authors":"D. V. Erofeev","doi":"10.1134/S0016793224700129","DOIUrl":"10.1134/S0016793224700129","url":null,"abstract":"The article studies microstreams, increases in solar wind (SW) currents up to several tens of km/s, with a time scale of the order of a day. A comparative analysis of microstreams present in the polar and low-latitude SW at different heliocentric distances has been carried out. The comparison showed that the properties of microstreams in the near-Earth fast SW are qualitatively similar to the properties of microstreams present in the polar SW during periods close to solar activity minima, at heliocentric distances from 2 to 4.5 AU. At the same time, the quantitative parameters of microstreams (amplitudes of variations in radial and tangential velocity, as well as relative variations in temperature, density, and plasma pressure) show a monotonic decrease with increasing heliocentric distance, which can be interpreted as a consequence of the gradual evolution of microstreams with distance from the Sun. However, comparison with SW measurements in the low-latitude region of the heliosphere at distances of about 5 AU shows some significant differences, which indicate a more rapid evolution of microstreams in the inhomogeneous low-latitude SW.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 7","pages":"1073 - 1079"},"PeriodicalIF":0.7,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994811","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

Mid-Term Solar Activity Oscillations and Geomagnetic Field Variations 中期太阳活动振荡与地磁场变化

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700208

N. G. Ptitsyna, I. M. Demina

引用次数: 0

Possible Influence of Solar Activity on Trajectories of Extratropical Cyclones in the North Atlantic: An Update 太阳活动对北大西洋温带气旋轨迹的可能影响：最新资料

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S001679322470004X

S. V. Veretenenko, P. B. Dmitriev

{"title":"Possible Influence of Solar Activity on Trajectories of Extratropical Cyclones in the North Atlantic: An Update","authors":"S. V. Veretenenko, P. B. Dmitriev","doi":"10.1134/S001679322470004X","DOIUrl":"10.1134/S001679322470004X","url":null,"abstract":"In this article we continue studying the influence of solar activity on the main trajectories of extratropical cyclones (storm tracks) in different parts of the North Atlantic during the cold half of the year (period of intense cyclogenesis). Long-term oscillations in the latitude of storm tracks in the areas located west and east of the Greenwich meridian are compared. It is shown that secular oscillations in latitudes of storm tracks (with periods of ∼80–100 years) are most distinctly pronounced in the western North Atlantic (longitudes 60°–40° W), weaken in the area of the Icelandic Low (30°−10° W), and completely disappear in the eastern part (0°−20° E), where multidecadal oscillations with periods of ∼50–60 years dominate. Bidecadal oscillations in cyclone trajectories (northward shift of trajectories during the declining phase and at the minima of even-numbered solar cycles) have the greatest amplitude in the region of the Icelandic Low and noticeably weaken east of Greenwich. It is shown that the shift of cyclone trajectories to the north in even cycles occurs under increased galactic cosmic ray (GCR) intensity compared to odd cycles. The data providing evidence for the influence of the stratospheric polar vortex on the position of North Atlantic cyclone trajectories are presented. It is suggested that possible reasons for oscillations in the vortex intensity are changes in the chemical composition and temperature regime of the middle polar stratosphere caused by variations in GCR fluxes and geomagnetic activity.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 7","pages":"1021 - 1032"},"PeriodicalIF":0.7,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994928","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

Preflare Fluctuations of Radio Emission from Active Regions of the Sun According to Observations at RSTN 根据RSTN观测太阳活跃区域射电辐射的耀斑前波动

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700087

V. E. Abramov-Maximov, I. A. Bakunina

引用次数: 0

Application of the Astronomical Theory of Climate Change to Explain Global Climate Events in the Late Pleistocene and Holocene 气候变化天文学理论在解释晚更新世和全新世全球气候事件中的应用

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700051

V. M. Fedorov, D. M. Frolov

{"title":"Application of the Astronomical Theory of Climate Change to Explain Global Climate Events in the Late Pleistocene and Holocene","authors":"V. M. Fedorov, D. M. Frolov","doi":"10.1134/S0016793224700051","DOIUrl":"10.1134/S0016793224700051","url":null,"abstract":"The study demonstrates the synchronicity of the positive and negative phases of summer irradiation of the Northern Hemisphere in the precession cycle with periods of global climate warming and cooling for the Late Pleistocene and Holocene. The cold phase 50–41.5 ka BP corresponds to the Shestikhinsky cooling in Eastern Europe and the development of glaciation in North America. The warm phase 41–30 ka BP accounts for climate warming in Europe (Bryansk interstadial, Paudorf, Gotwei warming) and in North America (Plum Point Interstadial). The period of maximum development of glaciation in Europe and North America is synchronized with the cold phase 29.5–17.5 ka BP. The warm phase 17–5.5 ka BP is associated with the transition from the cold Pleistocene to the relatively warm Holocene. The Little Ice Age falls on the cold phase 5 ka BP – 5000 CE. It is expected that warming of the climate with respect to the present will correspond to the Warm Epoch 5000–13 000 CE. Changes in solar radiation arriving in the first astronomical half of the year in 5° latitude zones were determined for all astronomical months of the tropical year for climatic precession extrema. This makes it possible to compare spatiotemporal changes in Earth’s solar climate during years of climate precession extrema.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 7","pages":"1033 - 1043"},"PeriodicalIF":0.7,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994927","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 Link between Lengths and Amplitudes of the Eleven-Year Cycle for the Millennium Sunspot Index Series 千禧年太阳黑子指数系列11年周期的长度和振幅之间的联系

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700117

V. G. Ivanov

引用次数: 0

Relationship of Asymmetries in the Distribution of Solar Tracer Activity and Generation of the Solar Magnetic Field 太阳示踪剂活性分布的不对称性与太阳磁场产生的关系

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700245

D. D. Sokolov, E. V. Yushkov

引用次数: 0

Effect of Corotating Interaction Regions of Solar Wind on GCR Intensity in 2D Modulation Problems 二维调制问题中太阳风旋转相互作用区对GCR强度的影响

IF 0.7 4区地球科学

Geomagnetism and Aeronomy Pub Date : 2025-01-16 DOI: 10.1134/S0016793224700154

M. S. Kalinin, M. B. Krainev, X. Luo, M. S. Podgieter

{"title":"Effect of Corotating Interaction Regions of Solar Wind on GCR Intensity in 2D Modulation Problems","authors":"M. S. Kalinin, M. B. Krainev, X. Luo, M. S. Podgieter","doi":"10.1134/S0016793224700154","DOIUrl":"10.1134/S0016793224700154","url":null,"abstract":"Сorotating interaction regions of solar wind flows with different velocities have actively been magnetohydrodynamically simulated for many years. However, the main goal is to predict heliospheric characteristics in Earth’s orbit, and so calculations are performed to distances of 1–1.5 AU. In the last decade, systematic magnetohydrodynamic calculations of corotating interaction regions up to much larger distances have appeared, which are necessary for studying recurrent variations in the intensity of galactic cosmic rays. Based on one of these calculations, we previously showed that, at least for one rotation of the Sun (Carrington rotation 2066, January–February 2008), the effect of corotating interaction regions on large-scale characteristics of the heliosphere that are important for GCR modulation and, therefore, the intensity averaged over longitude is significant. We assumed that the main principles of this effect of corotating interaction regions on GCRs can be studied both by 3D modeling of the GCR intensity and in much simpler 2D models. In this paper, we discuss the results, prospects, and shortcomings of such a 2D description of the effect of corotating interaction regions on the GCR intensity.","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"64 7","pages":"1098 - 1108"},"PeriodicalIF":0.7,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995026","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