Journal of Space Weather and Space Climate最新文献_第4页

The radiation environment over the African continent at aviation altitudes: First results of the RPiRENA-based dosimeter 非洲大陆航空高度的辐射环境:基于rpirena的剂量计的初步结果

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-03-04 DOI: 10.1051/swsc/2023007

Moshe Godfrey Mosotho, Du Toit Roelf Strauss, S. Böttcher, C. Diedericks

引用次数: 0

A height-dependent climatological model of the Equatorial ionospheric Zonal plasma Drifts (EZDrifts): Description and application to an analysis of the longitudinal variations of the zonal drifts 赤道电离层纬向等离子体漂移的高度相关气候模型（EZDrifts）：对纬向漂移纵向变化分析的描述和应用

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-03-03 DOI: 10.1051/swsc/2023006

Alexander Anthony Massoud, F. Rodrigues, S. Shidler

{"title":"A height-dependent climatological model of the Equatorial ionospheric Zonal plasma Drifts (EZDrifts): Description and application to an analysis of the longitudinal variations of the zonal drifts","authors":"Alexander Anthony Massoud, F. Rodrigues, S. Shidler","doi":"10.1051/swsc/2023006","DOIUrl":"https://doi.org/10.1051/swsc/2023006","url":null,"abstract":"We introduce the implementation of a global climatological model of the equatorial ionospheric F-region zonal drifts (EZDrifts) that is made available to the public. The model uses the analytic description of the zonal plasma drifts presented by Haerendel et al. (1992) and is driven by climatological models of the ionosphere and thermosphere under a realistic geomagnetic field configuration. EZDrifts is an expansion of the model of the zonal drifts first presented by Shidler and Rodrigues (2021) which was only valid for the Jicamarca longitude sector and two specific solar flux conditions. EZDrifts now uses vertical equatorial plasma drifts from the Scherliess and Fejer (1999) model which allows it to provide zonal drifts for any day of the year, longitude and solar flux condition. We show that the model can reproduce the main results of the Shidler and Rodrigues (2021) model for the Peruvian sector. We also illustrate an application of EZDrifts by presenting and discussing longitudinal variabilities produced by the model. We show that the model predicts longitudinal variations in the reversal times of the drifts that are in good agreement with observations made by C/NOFS. EZDrifts also predicts longitudinal variations in the magnitude of the drifts that can be identified in the June solstice observations made by C/NOFS. We also point out data-model differences observed during Equinox and December solstice. Finally, we explain that the longitudinal variations in the zonal plasma drifts are caused by longitudinal variations in the latitude of the magnetic equator and, consequently, in the wind dynamo contributing to the resulting drifts. EZDrifts is distributed to the community through a public repository and can be used in applications requiring an estimate of the overall behavior of the equatorial zonal drifts.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49070329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low latitude monthly total electron content composite correlations 低纬度月总电子含量复合相关性

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-03-01 DOI: 10.1051/swsc/2023005

D. Allen, D. Hodyss, V. Forsythe, S. McDonald

{"title":"Low latitude monthly total electron content composite correlations","authors":"D. Allen, D. Hodyss, V. Forsythe, S. McDonald","doi":"10.1051/swsc/2023005","DOIUrl":"https://doi.org/10.1051/swsc/2023005","url":null,"abstract":"Spatial correlations of total electron content (TEC) variability are compared among two SAMI3 model runs and Jet Propulsion Laboratory Global Ionospheric Maps (JPL/GIM). Individual monthly correlation maps are constructed with Equatorial reference points at 12 evenly spaced longitudes and 12 universal times. TEC composite correlations (TCCs) are then calculated by averaging the individual maps, shifted zonally to synchronize local time. The TCC structures are quantified using Gaussian fits in the zonal and meridional directions. A non-zero large-scale “base correlation” is found in all three datasets for 2014, a year with high solar activity. Higher base correlations generally occur in the SAMI3 runs than in JPL/GIM. The SAMI3 run driven with climatological neutral fields shows higher correlations than the run driven with neutrals from a Whole Atmosphere Community Climate Model and ionosphere extension (WACCM-X) simulation. Base correlation values strongly correlate with monthly F10.7 standard deviations. Empirical Orthogonal Function (EOF) analyses confirm the large-scale correlations are usually, although not always, related to solar forcing. Strong correlations between the Ap index and EOF modes are also observed, consistent with geomagnetic forcing of the TEC field. The width of the correlation structures are also examined, and these vary considerably with local time, month, and dataset. Off-Equator conjugate point correlations are also calculated from each dataset and variations with month and local time are analyzed. Analysis of TCCs for 2010, a year with low solar activity, shows that base correlations as well as correlations of the first EOF mode with F10.7 are generally weaker than in 2014.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47033740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nowcasting Geoelectric Fields in Ireland using Magnetotelluric Transfer Functions. 使用大地电磁传递函数对爱尔兰地电场进行实时预测。

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-02-09 DOI: 10.1051/swsc/2023004

J. Malone‐Leigh, J. Campanyà, P. Gallagher, Maik Neukirch, C. Hogg, J. Hodgson

{"title":"Nowcasting Geoelectric Fields in Ireland using Magnetotelluric Transfer Functions.","authors":"J. Malone‐Leigh, J. Campanyà, P. Gallagher, Maik Neukirch, C. Hogg, J. Hodgson","doi":"10.1051/swsc/2023004","DOIUrl":"https://doi.org/10.1051/swsc/2023004","url":null,"abstract":"Geomagnetically induced currents (GIC) driven by geoelectric fields pose a hazard to ground-based infrastructure, such as power grids and pipelines. Here, a new method is presented for modelling geoelectric fields in near real time, with the aim of providing valuable information to help mitigate the impact of GIC. The method uses magnetic field measurements from the Magnetometer Network of Ireland (MagIE; www.magie.ie), interpolates the geomagnetic field variations between magnetometers using spherical elementary current systems (SECS), and estimates the local electric field using a high density (< 40 km) network of magnetotelluric transfer functions (MT-TF) encompassing the island. The model was optimised to work in near real time, with a correction curve applied to the geoelectric field time series. This approach was successfully validated with measured electric fields at four sites for a number of geomagnetic storms, providing accurate electric fields up to a 1-minute delay from real time, with high coherence (0.70 – 0.85) and signal-to-noise ratio (SNR; 3.2 – 6.5) relative to measured electric field validation time series. This was comparable to a standard non real-time geoelectric field model (coherence = 0.80 – 0.89 and SNR = 4.0 – 7.0). The\u0000impact of galvanic distortion on the model was also briefly evaluated, with a galvanic distortion\u0000correction leading to a more homogeneous representation of the direction of the electric field, at a\u0000regional scale.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42408498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Rediscovering the observations of solar prominences from 1906 to 1957 recorded at the Madrid Astronomical Observatory 重新发现马德里天文台记录的1906年至1957年的日珥观测结果

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-02-06 DOI: 10.1051/swsc/2023003

Alejandro Jesús, Pérez Aparicio, V. Carrasco, M. C. Gallego, J. Vaquero

{"title":"Rediscovering the observations of solar prominences from 1906 to 1957 recorded at the Madrid Astronomical Observatory","authors":"Alejandro Jesús, Pérez Aparicio, V. Carrasco, M. C. Gallego, J. Vaquero","doi":"10.1051/swsc/2023003","DOIUrl":"https://doi.org/10.1051/swsc/2023003","url":null,"abstract":"The Madrid Astronomical Observatory implemented a solar observation program from 1876 to 1986. In addition to sunspots, the observers at this observatory recorded other solar features such as prominences. In this work, we have consulted the documentary sources of the Madrid Astronomical Observatory (the information is not digitally available), digitized the records of the observers on the annual number of prominences, and constructed a homogeneous series of the total and hemispheric annual number of prominences with heights of 25’’ and more for the period 1906 – 1957. To evaluate the quality of the data and assess their potential, we have compared the Madrid prominence series with the number of prominences recorded by the Astronomical Observatory of the University of Coimbra and other time series such as the sunspot number index, solar radio flux at 10.7 cm, and sunspot areas. We have also analyzed the hemispheric prominence numbers and the asymmetry index. We obtained the strongest correlation between Madrid and Coimbra prominence series (r = 0.7), whereas the correlations between Madrid prominence series and the other solar activity time series are similar (r ≈ 0.6). In addition, we found that the correlation coefficient between the Madrid prominence series and the sunspot number is lower than that from Coimbra prominence series and the sunspot number. We suggest that these differences are a consequence of the way prominences were counted in the Madrid Astronomical Observatory.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45035691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Field-aligned scale length of depleted structures associated with post-sunset equatorial plasma bubbles 与日落后赤道等离子体气泡相关的耗尽结构的场对准尺度长度

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-01-30 DOI: 10.1051/swsc/2023002

C. Xiong, H. Lühr

{"title":"Field-aligned scale length of depleted structures associated with post-sunset equatorial plasma bubbles","authors":"C. Xiong, H. Lühr","doi":"10.1051/swsc/2023002","DOIUrl":"https://doi.org/10.1051/swsc/2023002","url":null,"abstract":"In this study we make use of the Swarm counter-rotation constellation for estimating the typical scale length of the post-sunset equatorial plasma bubbles (EPBs) along fluxtubes. The close approaches between Swarm spacecraft near the equator occurred in September and October 2021, covering magnetic local time from 19:00 to 23:00, which is favorable for the occurrence of EPBs. It is the first time to show the quasi-simultaneously samplings by Swarm A/C and B of the same fluxtube but at different altitudes, and the observations frequently reveal plasma density depletions only at one spacecraft altitude, confirming that EPBs extend only over finite parts of the fluxtube. Based on a statistical analysis of double and single EPB detections on the same fluxtube, our results imply the typical field-aligned scale length of the depletion structures associated with EPBs of the order of 550 km. Our detections are from the lower part of the depleted fluxtubes, and they coincide well with the latitudes of the equatorial ionization anomaly. In the upper part of the fluxtube near the magnetic equator, our estimation technique does not work well because of too large field-aligned spacecraft separation of the Swarm satellites.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44554571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The effects of Solar radio bursts on frequency bands utilised by the aviation industry in Sub-Saharan Africa. 太阳射电暴对撒哈拉以南非洲航空业使用的频带的影响。

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-01-27 DOI: 10.1051/swsc/2023001

Sarah Ruth McKee, P. Cilliers, S. Lotz, C. Monstein

引用次数: 0

First 3D hybrid-Vlasov global simulation of auroral proton precipitation and comparison with satellite observations 首次对极光质子降水进行三维混合Vlasov全球模拟并与卫星观测结果进行比较

IF 3.3 2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-01-16 DOI: 10.1051/swsc/2023017

M. Grandin, Thijs Luttikhuis, M. Battarbee, G. Cozzani, Hongyang Zhou, L. Turc, Y. Pfau‐Kempf, H. George, K. Horaites, E. Gordeev, U. Ganse, Konstantinos E. Papadakis, M. Alho, F. Tesema, J. Suni, M. Dubart, V. Tarvus, M. Palmroth

{"title":"First 3D hybrid-Vlasov global simulation of auroral proton precipitation and comparison with satellite observations","authors":"M. Grandin, Thijs Luttikhuis, M. Battarbee, G. Cozzani, Hongyang Zhou, L. Turc, Y. Pfau‐Kempf, H. George, K. Horaites, E. Gordeev, U. Ganse, Konstantinos E. Papadakis, M. Alho, F. Tesema, J. Suni, M. Dubart, V. Tarvus, M. Palmroth","doi":"10.1051/swsc/2023017","DOIUrl":"https://doi.org/10.1051/swsc/2023017","url":null,"abstract":"The precipitation of charged particles from the magnetosphere into the ionosphere is one of the crucial coupling mechanisms between these two regions of geospace and is associated with multiple space weather effects, such as global navigation satellite system signal disruption and geomagnetically induced currents at ground level. While precipitating particle fluxes have been measured by numerous spacecraft missions over the past decades, it often remains difficult to obtain global precipitation patterns with a good time resolution during a substorm. Numerical simulations can help to bridge this gap and improve the understanding of mechanisms leading to particle precipitation at high latitudes through the global view they offer on the near-Earth space system. We present the first results on auroral (0.5–50 keV) proton precipitation within a 3-dimensional simulation of the Vlasiator hybrid-Vlasov model. The run is driven by southward interplanetary magnetic field conditions with constant solar wind parameters. We find that, on the dayside, cusp proton precipitation exhibits the expected energy–latitude dispersion and takes place in the form of successive bursts associated with the transit of flux transfer events formed through dayside magnetopause reconnection. On the nightside, the precipitation takes place within the expected range of geomagnetic latitudes, and it appears clearly that the precipitating particle injection is taking place within a narrow magnetic local time span, associated with fast Earthward plasma flows in the near-Earth magnetotail. Finally, the simulated precipitating fluxes are compared to observations from Defense Meteorological Satellite Program spacecraft during driving conditions similar to those in the simulation and are found to be in good agreement with the measurements.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45410358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Forecasting Solar Energetic Proton Integral Fluxes with Bi-Directional Long Short-Term Memory Neural Networks 利用双向长短期记忆神经网络预测太阳能量质子积分通量

2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-01-01 DOI: 10.1051/swsc/2023026

Mohamed Nedal, Kamen Kozarev, Nestor Arsenov, Peijin Zhang

{"title":"Forecasting Solar Energetic Proton Integral Fluxes with Bi-Directional Long Short-Term Memory Neural Networks","authors":"Mohamed Nedal, Kamen Kozarev, Nestor Arsenov, Peijin Zhang","doi":"10.1051/swsc/2023026","DOIUrl":"https://doi.org/10.1051/swsc/2023026","url":null,"abstract":"Solar energetic particles are mainly protons and originate from the Sun during solar flares or coronal shock waves. Forecasting the Solar Energetic Protons (SEP) flux is critical for several operational sectors, such as communication and navigation systems, space exploration missions, and aviation flights, as the hazardous radiation may endanger astronauts’, aviation crew, and passengers’ health, the delicate electronic components of satellites, space stations, and ground power stations. Therefore, the prediction of the SEP flux is of high importance to our lives and may help mitigate the negative impacts of one of the serious space weather transient phenomena on the near-Earth space environment. Numerous SEP prediction models are being developed with a variety of approaches, such as empirical models, probabilistic models, physics-based models, and AI-based models. In this work, we use the bidirectional long short-term memory (BiLSTM) neural network model architecture to train SEP forecasting models for three standard integral GOES channels (>10 MeV, >30 MeV, >60 MeV) with three forecast windows (1-day, 2-day, and 3-day ahead) based on daily data obtained from the OMNIWeb database from 1976 to 2019. As the SEP variability is modulated by the solar cycle, we select input parameters that capture the short-term, typically within a span of a few hours, and long-term, typically spanning several days, fluctuations in solar activity. We take the F10.7 index, the sunspot number, the time series of the logarithm of the X-ray flux, the solar wind speed, and the average strength of the interplanetary magnetic field as input parameters to our model. The results are validated with an out-of-sample testing set and benchmarked with other types of models.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135556933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observational evidence of thermospheric wind and composition changes and the resulting ionospheric disturbances in the European sector during extreme geomagnetic storms 在极端地磁风暴期间，热层风和成分变化的观测证据以及在欧洲扇区产生的电离层扰动

2区物理与天体物理

Journal of Space Weather and Space Climate Pub Date : 2023-01-01 DOI: 10.1051/swsc/2023025

Jeongheon Kim, Young-Sil Kwak, Changsup Lee, Jaewook Lee, Hosik Kam, Tae-Yong Yang, Geonhwa Jee, YongHa Kim

{"title":"Observational evidence of thermospheric wind and composition changes and the resulting ionospheric disturbances in the European sector during extreme geomagnetic storms","authors":"Jeongheon Kim, Young-Sil Kwak, Changsup Lee, Jaewook Lee, Hosik Kam, Tae-Yong Yang, Geonhwa Jee, YongHa Kim","doi":"10.1051/swsc/2023025","DOIUrl":"https://doi.org/10.1051/swsc/2023025","url":null,"abstract":"On November 1st and 2nd, 2021, four Halo coronal mass ejections were ejected from the Sun, releasing billions of tons of high-energy particles into interplanetary space. These were directed towards the Earth and reached our planet on November 3rd and 4th, 2021, generating the first G3-level extreme geomagnetic storm since the beginning of the 25th solar cycle. In this study, we investigate the thermospheric and ionospheric responses in the European sector to a G3-level storm using various observational data from Fabry-Perot interferometer, Ionospheric Connection Explorer/Michelson Interferometer for Global High-resolution Thermospheric Imaging (ICON/MIGHTI), and Thermosphere Ionosphere Mesosphere Energetics and Dynamics/Global Ultraviolet Imager (TIMED/GUVI). The results show positive ionospheric storms in the middle and low latitudes of Europe which may be associated with the equatorward and westward neutral winds induced by heating in the polar region. In contrast, negative storms were detected at high latitudes in association with the increase in thermospheric density (upwelling). These two antithetical responses were confirmed by using European ionosonde and total electron contents (TEC) observation chains distributed over a wide range of latitudes. Finally, we, for the first time, attempt to identify the imaginary boundary line between the two responses.","PeriodicalId":17034,"journal":{"name":"Journal of Space Weather and Space Climate","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135402135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0