Radiophysics and Quantum Electronics最新文献

Simultaneous Observations of Quasi-Periodic VLF Emissions by Spacecraft and on the Ground and Localization of Their Generation Region 宇宙飞船和地面准周期VLF发射的同时观测及其产生区域的定位

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-23 DOI: 10.1007/s11141-026-10456-0

A. G. Demekhov, E. E. Titova, A. A. Lyubchich, D. L. Pasmanik, J. Manninen, A. V. Larchenko

{"title":"Simultaneous Observations of Quasi-Periodic VLF Emissions by Spacecraft and on the Ground and Localization of Their Generation Region","authors":"A. G. Demekhov, E. E. Titova, A. A. Lyubchich, D. L. Pasmanik, J. Manninen, A. V. Larchenko","doi":"10.1007/s11141-026-10456-0","DOIUrl":"10.1007/s11141-026-10456-0","url":null,"abstract":"We present the results of studies of simultaneous ground-based and spacecraft observations of quasiperiodic VLF emissions. About 20 events were selected in which a one-to-one correspondence between the elements of quasi-periodic emissions onboard the Van Allen Probes spacecraft and at the Kannuslehto ground-based observatory (Finland, 67.74°N, 26.27°E; McIlwain parameter L ≈ 5.5) was observed. This correspondence occurred over a wide range of latitudes (~ 20°) and longitudes (~ 90°) at distances of up to 3000 km between the geomagnetic projection of the spacecraft trajectory to the Earth and the ground-based station. By using multicomponent wave field measurements onboard Van Allen Probes spacecraft, we found the sections of their orbits at which the VLF waves propagated almost along the geomagnetic field and the energy flux (Poynting vector) was directed away from the geomagnetic equator. Using the data on the energetic electron distribution function obtained by the same spacecraft we calculated the growth rate of the cyclotron instability of whistler-mode waves in the magnetosphere. Comparison of the results of these calculations with the results of multicomponent VLF wave measurements allowed us to find probable generation regions of quasi-periodic emissions. It is shown that these regions are clustered in the L-shell interval from 4 to 5.5, and their characteristic radial size is ΔL ≈ 0.1–0.5, which is much smaller than the size of the quasi-periodic emission observation region (ΔL ≈ 1–3).","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 4","pages":"249 - 269"},"PeriodicalIF":0.7,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147636902","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

Scientific Works by M. I. Rabinovich and Modern Theory of Oscillations and Waves 拉宾诺维奇的科学著作和现代振荡与波动理论

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-21 DOI: 10.1007/s11141-026-10462-2

I. S. Aranson, A. I. Malekhanov, V. I. Nekorkin, A. S. Pikovsky, L. Sh. Tsimring, A. L. Fabrikant

引用次数: 0

Estimation of the Initial Approximation for the Radio Source Positioning Problem Based on Limited Satellite Constellations 基于有限卫星星座的射电源定位问题的初始逼近估计

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-21 DOI: 10.1007/s11141-026-10461-3

I. V. Grin, O. A. Morozov, M. A. Nalchajyan

引用次数: 0

Reflection of a Gaussian Beam from an Arbitrary Number of Plane-Parallel Dielectric Plates 高斯光束在任意数目平行介质板上的反射

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-21 DOI: 10.1007/s11141-026-10460-4

A. V. Ryabov, A. V. Palitsin

引用次数: 0

On Determination of the Atmospheric Optical Thickness from Absolute Measurements of Sky Brightness Temperature in the Millimeter Wavelength Range 利用毫米波段天空亮度温度的绝对测量确定大气光学厚度

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-20 DOI: 10.1007/s11141-026-10459-x

I. I. Zinchenko, E. A. Kopylov

引用次数: 0

Critical Currents in Coronal Magnetic Loops and Their Possible Manifestation During Flare Processes 日冕磁环中的临界电流及其在耀斑过程中的可能表现

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-20 DOI: 10.1007/s11141-026-10455-1

V. V. Zaitsev, T. V. Simonova

引用次数: 0

Peculiarities of the HF Signal Mode Structure on Mid-Latitude Radio Paths During Geomagnetic Storms in November–December 2023 2023年11 - 12月地磁暴中纬度无线电路径高频信号模式结构特征

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-20 DOI: 10.1007/s11141-026-10457-z

S. N. Ponomarchuk, N. A. Zolotukhina, V. I. Kurkin

{"title":"Peculiarities of the HF Signal Mode Structure on Mid-Latitude Radio Paths During Geomagnetic Storms in November–December 2023","authors":"S. N. Ponomarchuk, N. A. Zolotukhina, V. I. Kurkin","doi":"10.1007/s11141-026-10457-z","DOIUrl":"10.1007/s11141-026-10457-z","url":null,"abstract":"Geomagnetic storms are followed by ionospheric disturbances of various kinds (ionospheric storms) that change the conditions of HF propagation. Radio wave propagation is most significantly affected by the spatial location of large-scale structures such as the main ionospheric trough and the zone of diffuse electron precipitation. During magnetic storms, they shift to lower latitudes, causing strong variations in the maximum observed frequencies (MOFs) of radio wave propagation on mid-latitude paths, deviation of signal propagation trajectories from the great-circle arc, and the occurrence of anomalous diffuse signals with delays exceeding those of the regular propagation modes, as well as the absence of radio wave transmission. From the analysis of oblique ionospheric sounding with a continuous chirp signal on the Magadan–Irkutsk and Norilsk–Irkutsk paths, we studied the peculiarities of the HF signal mode structure during strong and moderate magnetic storms in November–December 2023. Relation between MOF variations and positions of the main ionospheric trough and the equatorial boundary of the diffuse electron precipitation zone relative to the propagation path was revealed.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 4","pages":"270 - 285"},"PeriodicalIF":0.7,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147636903","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

Signals Scattered in the Main and Back Lobes of the Antenna Pattern of ISTP SB RAS Coherent Scatter Radars isp SB - RAS相干散射雷达天线方向图主、后瓣散射信号

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-03-20 DOI: 10.1007/s11141-026-10458-y

O. I. Berngardt, R. R. Fedorov

{"title":"Signals Scattered in the Main and Back Lobes of the Antenna Pattern of ISTP SB RAS Coherent Scatter Radars","authors":"O. I. Berngardt, R. R. Fedorov","doi":"10.1007/s11141-026-10458-y","DOIUrl":"10.1007/s11141-026-10458-y","url":null,"abstract":"Based on the analysis of data from two coherent scatter radars of the Institute of Solar–Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences (ISTP SB RAS), we show that these radars record a significant (up to 35%) number of signals coming from the back lobe of the antenna pattern, which had not been previously taken into account in automatic data processing. The complexity of such analysis is due to the uncertainty in calculating the elevation angle of the received signals (the spacing between two linear antenna arrays exceeds the wavelength of the radio wave). In this paper, we discuss a fast and simple method for detecting such back lobe signals that is based on threshold processing of the elevation angle of the received radio waves. The optimal threshold elevation angle that minimizes the errors in separating signals into mainlobe and back lobe ones is calculated on the basis of modeling and the Bayesian approach. This elevation angle is 28° for the EKB radar and 38° for the MAGW radar. The presence of the effect and its significance at the MAGW radar have been proven to the first time by direct measurementsof the elevation angle using a specially deployed antenna array perpendicular to two other antenna arrays of the radar. The optimality of the threshold elevation angle has been proven for the first time by a ray tracing analysis of all the signals observed by the radars in 2021, rather than only ground backscatter signals, which are commonly used. Based on these experimental results it has been proven for the first time that the found threshold elevation angle is the optimal angle for separating signals into interpretable and uninterpretable from the point of view of radio wave propagation in the main beam. Statistics of observations of signals outside the main lobe of the antenna pattern of the MAGW and EKB ISTP SB RAS radars are presented for the first time.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 4","pages":"286 - 299"},"PeriodicalIF":0.7,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147636906","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

A Calculation of the Surface Current and Radiation Field of an Ideal Half-Plane Excited by a Slot Perpendicular to its Edge 垂直于狭缝激励的理想半平面表面电流和辐射场的计算

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10454-2

E. I. Nefedov, I. I. Ponomarev, V. P. Zayarnyi, E. S. Semenov

{"title":"A Calculation of the Surface Current and Radiation Field of an Ideal Half-Plane Excited by a Slot Perpendicular to its Edge","authors":"E. I. Nefedov, I. I. Ponomarev, V. P. Zayarnyi, E. S. Semenov","doi":"10.1007/s11141-026-10454-2","DOIUrl":"10.1007/s11141-026-10454-2","url":null,"abstract":"The problem of establishing the relationship between the surface currents and the radiation field of a perfectly conducting half-plane excited by slots of various shapes (constant width, linearly or exponentially expanding, etc.) perpendicular to the edge of the half-plane is solved. The relationships are obtained which allow one to calculate the currents induced on the surface of a half-plane affecting the radiation-field creation. The relationship of the surface currents on the half-plane with radiation patterns (RP) of the corresponding slot antennas (SA) is established. The curves of the surface currents and RP for SA of constant width are calculated on the basis of the obtained formulas. The patterns of variation in the current dependences on the geometric dimensions of the slot and their effect on the corresponding RP were established. It has been shown that experimentally measured RP for similar experimental SA confirm the identified regularities for the corresponding design currents and RP, and make it possible to establish the applicability range for the obtained mathematical models. The SA studies were carried out in the frequency range 8–12 GHz (the average frequency is 10 GHz). The validity of the obtained models in this frequency range is shown.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"231 - 240"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338804","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

Radical Acceleration of the Method for Synthesizing Waveguide Emitters of Gyrodevices Based on the Iterative Physical Optics Method 基于迭代物理光学法合成陀螺器件波导发射器方法的径向加速

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10451-5

A. P. Gashturi, G. G. Denisov, D. I. Sobolev

{"title":"Radical Acceleration of the Method for Synthesizing Waveguide Emitters of Gyrodevices Based on the Iterative Physical Optics Method","authors":"A. P. Gashturi, G. G. Denisov, D. I. Sobolev","doi":"10.1007/s11141-026-10451-5","DOIUrl":"10.1007/s11141-026-10451-5","url":null,"abstract":"We present a modification of the method for synthesizing the surface of waveguide transducers, which are developed at the Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), in combination with solving of a system of scalar integral equations for the surface electric current. Since the synthesis procedure operates on the components of the electromagnetic field on the surface, which are unambiguously related to the current, the specified equations are integrated into it seamlessly. The equations are derived from the original vector integral equation of iterative physical optics, which is a method for analysis of electromagnetic fields in oversized systems, for a waveguide with a smooth wall deformation. The method is used in the calculation of high-power microwave devices (gyrotrons) and for the synthesis of waveguide emitters that convert the high-frequency operating mode into a quasi-Gaussian field distribution at the output by using a smooth shallow deformation of the waveguide. The possibility of significantly accelerating the synthesis while maintaining the high efficiency of the obtained profile is shown using the example of an emitter operated at a frequency of 184 GHz with the TE28.13 mode.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"205 - 208"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338806","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