Solar-Terrestrial Physics最新文献_第6页

Reverse-Bias Defect Creation in Cu(In,Ga)Se2 Solar Cells and Impact of Encapsulation Cu(in,Ga)Se2太阳能电池中反向偏置缺陷的产生及其封装的影响

IF 1.1

Solar-Terrestrial Physics Pub Date : 2023-04-06 DOI: 10.3390/solar3020012

T. S. Vaas, B. Pieters, A. Gerber, U. Rau

引用次数: 0

A quiet day empirical model of electron density in the Indian equatorial F-region 印度赤道f区电子密度的静日经验模型

IF 1.1

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202308

M. Chamua, P. Bhuyan, K. Bhuyan

{"title":"A quiet day empirical model of electron density in the Indian equatorial F-region","authors":"M. Chamua, P. Bhuyan, K. Bhuyan","doi":"10.12737/stp-91202308","DOIUrl":"https://doi.org/10.12737/stp-91202308","url":null,"abstract":"In this paper, we present a quiet day empirical model of electron density (Ne) for the Indian equatorial zone at an altitude of 500 km. The model is applicable to all levels of solar activity and is based on the observation that the electron density in the F-region of the Indian zone is correlated with the F10.7 cm solar flux at each local time and in every month. Using this characteristic, we describe the model for electron density. In this model, we have used the least square fit and the polynomial fit. The electron density measured by the Retarding Potential Analyzer (RPA) on board the SROSS C2 satellite from 1995 to 2000 and FORMOSAT-1 (ROCSAT-1) satellite, operated by the National Space Organization (NSPO, now the Taiwan Space Agency (TASA)) of the Republic of China (Taiwan), from 1999 to 2004 is used to derive the relationship between Ne and F10.7. The average altitudes of SROSS-C2 and FORMOSAT-1 are 500 km and 600 km respectively. Due to this height difference, the observed data obtained by FORMOSAT-1 is normalized to match the SROSS-C2 data. The model is compared with the observations and is found to be in good agreement with them. It is applicable to quiet (Ap<15) conditions and is limited to a fixed altitude of 500 km within the latitude range of 10° S to 10° N around the 75° E meridian.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"57 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41296190","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

Application of convolution neural networks for critical frequency fₒF2 prediction 卷积神经网络在临界频率fₒF2预测中的应用

IF 1.1

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202307

B. Salimov, O. Berngardt, A. Hmelnov, K. Ratovsky, Oleg Kusonsky

{"title":"Application of convolution neural networks for critical frequency fₒF2 prediction","authors":"B. Salimov, O. Berngardt, A. Hmelnov, K. Ratovsky, Oleg Kusonsky","doi":"10.12737/stp-91202307","DOIUrl":"https://doi.org/10.12737/stp-91202307","url":null,"abstract":"Ionosphere has an important impact on the quality of radio communication, radar, and global positioning. One of the essential characteristics describing the state of the ionosphere is its critical frequency fₒF2. Its prediction provides effective modes of operation of technical radio equipment as well as enables calculation of the corrections needed to improve the accuracy of its functioning. Different physical and empirical models are generally used for fₒF2 prediction. This paper proposes an empirical prediction technique based on machine learning methods and observational history. It relies on a regression approach to the prediction based on the known daily quasi-periodicity of ionospheric parameters related to solar illumination. Algorithmically, this approach is implemented in the form of convolutional neural networks with two-dimensional convolution. The input data for the analysis is presented as two-dimensional solar time — date matrices. The model was trained on data from the mid-latitude ionosonde in Irkutsk (RF) and tested using data from several mid-latitude ionosondes: Arti (RF), Warsaw (Poland), Mohe (China). It is shown that the main contribution to the prediction value of fₒF2 is made by the data on the nearest few days before the prediction; the contribution of the remaining days strongly decreases. This model has the following forecast quality metrics (Pearson correlation coefficient 0.928, root mean square error 0.598 MHz, mean absolute error in percent 10.45 %, coefficient of determination 0.861) and can be applied to fₒF2 forecast in middle latitudes.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45465545","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

Electromagnetic ULF/ELF oscillations caused by the eruption of the Tonga volcano 汤加火山喷发引起的电磁极低频振荡

IF 1.1

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202306

V. Martines-Bedenko, V. Pilipenko, K. Shiokawa, R. Akbashev

引用次数: 1

Measurement of energy distribution for low power nanoflares 低功率纳米耀斑能量分布的测量

IF 1.1

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202301

S. Bogachev, N. Erkhova

引用次数: 1

Definition of the Alfvén mode in inhomogeneous magnetic field 非均匀磁场中Alfvén模的定义

IF 1.1

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202304

D. Klimushkin, P. Mager

引用次数: 0

Geomagnetic variations in the frequency range 2.5–12 Hz in the ionospheric F layer as measured by SWARM satellites SWARM卫星测量的电离层F层2.5 - 12hz频率范围内的地磁变化

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202305

Nadezhda Yagova, Eugeny Fedorov, Vyacheslav Pilipenko, Nikolay Mazur, Valeriy Martines-Bedenko

{"title":"Geomagnetic variations in the frequency range 2.5–12 Hz in the ionospheric F layer as measured by SWARM satellites","authors":"Nadezhda Yagova, Eugeny Fedorov, Vyacheslav Pilipenko, Nikolay Mazur, Valeriy Martines-Bedenko","doi":"10.12737/stp-91202305","DOIUrl":"https://doi.org/10.12737/stp-91202305","url":null,"abstract":"We have analyzed geomagnetic variations in the 2.5–12 Hz frequency range in the ionospheric F layer above the electron density maximum, using data from two SWARM satellites. The analysis is based on the data obtained under weak and moderate magnetic activity for 12 days in September and December 2016. To separate spatial inhomogeneities from time variations of the magnetic field, we analyzed signal waveforms and cross-spectra in a 2.56 s sliding window. A maximum in the occurrence and power spectral density of the variations was found at latitudes above the polar boundary of the auroral oval, which correspond to the magnetospheric input layers and dayside polar cusp/cleft. Typical waveforms of the high-latitude variations are the wave packets lasting for 5–10 periods, recorded with a short time delay by two satellites spaced by 40–100 km. These variations might be the ionospheric manifestation of the electromagnetic ion-cyclotron waves generated at the non-equatorial magnetosphere near the polar cusp. The waveforms and cross-spectra of the variations are examined in more details for two cases with different spatial distributions of the magnetic field in the ionosphere. For the ionospheric conditions corresponding to event 1 (September 17, 80° geomagnetic latitude, afternoon sector), spatial distributions of wave magnetic field in the ionosphere and on Earth are estimated using a model of Alfvén beam with a finite radius incident on the ionosphere [Fedorov et al., 2018].","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135627454","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

Features of artificial ionosphere turbulence induced by the O- and X-mode HF heating near the F2-layer critical frequency f - 2层临界频率附近O和x模HF加热诱导的人工电离层湍流特征

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202303

Tatiana Borisova, Nataly Blagoveshchenskaya, Alexey Kalishin

{"title":"Features of artificial ionosphere turbulence induced by the O- and X-mode HF heating near the F2-layer critical frequency","authors":"Tatiana Borisova, Nataly Blagoveshchenskaya, Alexey Kalishin","doi":"10.12737/stp-91202303","DOIUrl":"https://doi.org/10.12737/stp-91202303","url":null,"abstract":"We present experimental results from the studies of large-scale inhomogeneities along the external magnetic field with increased electron density, electron temperature, and excitation of elongated plasma waves (Langmuir and ion-acoustic), induced by the ordinary (O-mode) and extraordinary (X-mode) HF heating near the F2-layer critical frequency, in the high-latitude ionospheric F-region. The experiments have been carried out at the EISCAT/Heating facility (Tromsø, Norway). Powerful HF radio waves radiated towards the magnetic zenith through a step change in the effective radiated power at frequencies fH near and below the F2-layer critical frequency fₒF2. The EISCAT incoherent scatter radar (930 MHz), co-located with the EISCAT/Heating facility, was utilized for diagnostics of ionospheric modification effects. We calculated the electric field of a powerful HF radio wave near the reflection altitude, taking into account the non-deflective absorption along the propagation path. We determined the conditions for electric field generation and its threshold (minimum) values required for electron density enhancements in a wide altitude range, excitation of Langmuir and ion-acoustic plasma waves under fH~fₒF2 and fH<fₒF2. The possible generation mechanisms for the electron density enhancements above the reflection altitude of the powerful HF radio wave of O- and X-polarization are discussed.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135627210","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

Manifestation of solar wind corotating interaction regions in GCR intensity variations 太阳风自转相互作用区域在GCR强度变化中的表现

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202302

Mikhail Krainev, Mikhail Kalinin, Galina Bazilevskaya, Albina Svirzhevskaya, Nikolay Svirzhevsky, Xi Luo, O.P.M. Aslam, F. Shen, M.D. Ngobeni, M.S. Potgieter

引用次数: 1

Current status of the temperature and humidity regime of the troposphere in the Siberian sector in different circulation periods 不同环流时期西伯利亚扇区对流层温湿度状况的现状

Solar-Terrestrial Physics Pub Date : 2023-03-28 DOI: 10.12737/stp-91202309

Elena Belousova, Inna Latysheva, Kristina Loschenko, Sergey Olemskoy

{"title":"Current status of the temperature and humidity regime of the troposphere in the Siberian sector in different circulation periods","authors":"Elena Belousova, Inna Latysheva, Kristina Loschenko, Sergey Olemskoy","doi":"10.12737/stp-91202309","DOIUrl":"https://doi.org/10.12737/stp-91202309","url":null,"abstract":"The paper studies the long-term dynamics of air temperature and relative humidity anomaly indices in the surface layer and at different levels of the troposphere in Siberia and neighboring regions (European and Far Eastern sectors). As the main cause of the observed variations in climatic parameters we considered circulation factors, which were taken into account using the typification of macrocirculation processes proposed by B.L. Dzerdzeevsky. Seasonal differences were revealed in the distribution of anomaly indices and the area occupied by anomalies of different signs of annual and monthly mean temperature and relative air humidity, which are most pronounced during circulation periods of increased duration of meridional northern processes in the Siberian sector and in the Northern Hemisphere as a whole. The highest rates of change in the temperature regime in the Siberian sector over recent decades have been observed at the level of the isobaric surface AT–700 hPa (3 km), which affects the advective-dynamic factors of surface cyclo- and frontogenesis, as well as the processes of cloud formation and precipitation. In general, an increase in the heat content of the lower and middle troposphere and a decrease in the relative moisture content near the tropopause can be accompanied by an increase in the amount of the potential energy and convective instability energy reserves and can lead to an increase in climate risks in the Siberian sector.","PeriodicalId":43869,"journal":{"name":"Solar-Terrestrial Physics","volume":"335 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135677146","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