Journal of Geophysical Research: Space Physics最新文献_第10页

An Investigation of the Third Harmonic Power Line Emission in the Topside Ionosphere During the Recent Solar Minimum Period 近期太阳极小期顶层电离层三次谐波电力线发射研究

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-30 DOI: 10.1029/2024JA032899

Li Liao, Shufan Zhao, Zhenhui Ma, Xuhui Shen, Huaiyun Peng, HengXin Lu

{"title":"An Investigation of the Third Harmonic Power Line Emission in the Topside Ionosphere During the Recent Solar Minimum Period","authors":"Li Liao, Shufan Zhao, Zhenhui Ma, Xuhui Shen, Huaiyun Peng, HengXin Lu","doi":"10.1029/2024JA032899","DOIUrl":"https://doi.org/10.1029/2024JA032899","url":null,"abstract":"Power line harmonic radiation (PLHR) events are radiated by electric power systems on the ground at harmonics of the base power system frequency (50 or 60 Hz, depending on the region). We analyze the global third harmonics PLHR at 150 and 180 Hz using electric field data collected by China Seismo-Electromagnetic Satellite during the recent solar minimum between January 2019 and December 2022. The average frequency spectrum over industrialized areas shows that the third harmonic has a high occurrence rate in the U.S. region, as well as in western China and northern India, but is very low in the European region. In particular, in the China region and the U.S. region, more than 11,000 and 24,000 dayside and nightside third harmonic PLHR events have been detected from 2019 to 2022, respectively. Compared to the 150 Hz PLHR occurrence rate detected above the China region, the 180 Hz PLHR occurrence rate above the U.S. region is higher, which reveals a significant regional difference. In addition, both at nighttime and daytime, the PLHR electric field intensities at 180 Hz are higher than that at 60 Hz above the U.S. region, which is also different from the result above the China region.","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Source of the Observed Enhancements in Thermospheric ΣO/N2 During Two Solar Eclipses in 2023 2023 年两次日食期间观测到的热层 ΣO/N2 增强的来源

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-26 DOI: 10.1029/2024JA032542

C. E. Cantrall, S. Mrak, L. J. Paxton, Y. Zhang, R. Nikoukar, R. K. Schaefer, J. H. Yee

{"title":"Source of the Observed Enhancements in Thermospheric ΣO/N2 During Two Solar Eclipses in 2023","authors":"C. E. Cantrall, S. Mrak, L. J. Paxton, Y. Zhang, R. Nikoukar, R. K. Schaefer, J. H. Yee","doi":"10.1029/2024JA032542","DOIUrl":"10.1029/2024JA032542","url":null,"abstract":"Two solar eclipse events in 2023 appeared to produce considerable enhancements in the thermospheric column density ratio of monatomic oxygen to molecular nitrogen (ΣO/N2) as measured by TIMED GUVI. We quantify potential sources for eclipse-induced ΣO/N2 changes and find that the observed enhancements arise from the ionospheric O+ radiative recombination contribution to the OI 135.6 nm emission from which ΣO/N2 is derived. Variations in the solar Extreme Ultra Violet (EUV) and X-ray spectrum, due to the difference between the disk spectrum and the coronal spectrum, are also considered but shown to have negligible contributions to the ΣO/N2 enhancements. After accounting for the radiative recombination contribution, we constrain the real thermospheric compositional change to the uncertainty level of the measurements of 5%–10%. These results are valuable for the interpretation of eclipse-induced ΣO/N2 changes that will further first-principle model comparisons and lead to a better understanding of the response of the thermosphere to localized variations in solar EUV and X-ray forcing.","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JA032542","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141847204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pole-To-Pole Ionospheric Disturbances Due To Solar Flares, During Low Solar Activity 低太阳活动期间太阳耀斑造成的极对极电离层扰动

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-26 DOI: 10.1029/2024JA032597

P. R. Fagundes, V. G. Pillat, A. Tardelli, M. T. A. H. Muella

{"title":"Pole-To-Pole Ionospheric Disturbances Due To Solar Flares, During Low Solar Activity","authors":"P. R. Fagundes, V. G. Pillat, A. Tardelli, M. T. A. H. Muella","doi":"10.1029/2024JA032597","DOIUrl":"10.1029/2024JA032597","url":null,"abstract":"There are growing concerns about the effect of solar flares on the ionosphere, mainly due to possible deterioration or damage to our communication and navigation satellite systems. On 3 July 2021, and 28 October 2021, there were solar flares (SFs) classified as X1.59 and X1.0, respectively. These two SFs were the only ones of X-class that occurred during the last low solar activity (LSA:2018–2021). Data from magnetometers and Global Positioning System (GPS)—Total Electron Content (TEC) are used to investigate the spatial-temporal electrodynamics of the ionosphere from pole-to-pole in the American sector. Employing ∆H and vertical TEC, along with the ROT (rate of change of VTEC) parameter. Rapidly ∆H disturbances closely follow the X-ray variation and the ∆H valleys and peaks are well-synchronized during the SFs, indicating that they are linked. Major disturbances in the ∆H are noticed in the mid-low-equatorial latitudes. However, minor disturbances were seen at high latitudes. Also, |ROT| is a good indicator of the electron density changes during the SFs, especially when the X-ray intensity rises to the peak.","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141849072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Cross-Scale Energy Transfer From Ion-Scale to Electron-Scale Waves in the Earth's Foreshock Region 地球前震区从离子波到电子波的跨尺度能量转移

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-25 DOI: 10.1029/2024JA032567

Rui Chen, Xinliang Gao, Zhongwei Yang, Quanming Lu, Zhenyu Kong, Jiuqi Ma, Yangguang Ke, Chi Wang

引用次数: 0

Empirical Model of the Lowest Cutoff Altitude of Global Hiss Near Magnetic Equator 磁赤道附近全球嘶嘶声最低临界高度的经验模型

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-25 DOI: 10.1029/2024JA032886

L. Y. Li, L. Yang, K. X. Cheng, J. B. Cao, J. Y. Yang, J. J. Berthelier

引用次数: 0

Probable Controls From the Lower Layers on Sporadic E Layer Over East Asia 低层对东亚上空零星 E 层的可能控制作用

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-25 DOI: 10.1029/2023JA032379

Hai-Sheng Zhao, Zheng-Wen Xu, Kun Xue, Jian Wu, Ya-Xin Liu, Jie Feng, Cheng Wang, Yu-Sheng Zhang, Na Li

引用次数: 0

Determination of Outer Radiation Belt MeV Electron Energization Rates and Delayed Response Times to Solar Wind Driving During Geomagnetic Storms 地磁暴期间外辐射带兆电子伏电子能率和太阳风驱动延迟响应时间的测定

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-25 DOI: 10.1029/2023JA032115

P. Srinivas, E. Spencer

{"title":"Determination of Outer Radiation Belt MeV Electron Energization Rates and Delayed Response Times to Solar Wind Driving During Geomagnetic Storms","authors":"P. Srinivas, E. Spencer","doi":"10.1029/2023JA032115","DOIUrl":"10.1029/2023JA032115","url":null,"abstract":"Radiation Belt Storm Probes (RBSP) data show that seed electrons generated by sub-storm injections play a role in amplifying chorus waves in the magnetosphere. The wave-particle interaction leads to rapid heating and acceleration of electrons from 10's of keV to 10's of MeV energies. In this work, we examined the changes in the radiation belt during geomagnetic storm events by studying the RBSP REPT, solar wind, AL, SML, and Dst data in conjunction with the WINDMI model of the magnetosphere. The field-aligned current output from the model is integrated to generate a proxy E index for various energy bands. These E indices track electron energization from 40 KeV to 20 MeV in the radiation belts. The indices are compared to RBSP data and GOES data. Our proxy indices correspond well to the energization data for electron energy bands between 1.8 and 7.7 MeV. Each E index has a unique empirical loss rate term (τL), an empirical time delay term (τD), and a gain value, that are fit to the observations. These empirical parameters were adjusted to examine the delay and charging rates associated with different energy bands. We observed that the τL and τD values are clustered for each energy band. τL and τD consistently increase going from 1.8 to 7.7 MeV in electron energy flux Ee and the dropout interval increases with increasing energy level. The average trend of ΔτD/ΔEe was 4.1 hr/MeV and the average trend of ΔτL/ΔEe was 2.82 hr/MeV.","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Radial and Vertical Structures of Plasma Disk in Jupiter's Middle Magnetosphere 木星中磁层等离子盘的径向和垂直结构

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-25 DOI: 10.1029/2024JA032715

Jian-Zhao Wang, Fran Bagenal, Robert J. Wilson, Edward Nerney, Robert W. Ebert, Philip W. Valek, Frederic Allegrini

{"title":"Radial and Vertical Structures of Plasma Disk in Jupiter's Middle Magnetosphere","authors":"Jian-Zhao Wang, Fran Bagenal, Robert J. Wilson, Edward Nerney, Robert W. Ebert, Philip W. Valek, Frederic Allegrini","doi":"10.1029/2024JA032715","DOIUrl":"10.1029/2024JA032715","url":null,"abstract":"The Juno mission flew through the plasma disk near the equator in Jupiter's magnetosphere frequently. We identify 274 plasma disk crossings of Juno between 10 and 40 RJ from PJ5 to PJ44. Using a forward modeling method that combines the JADE-I time-of-flight and SPECIES data sets, we perform a survey of ion properties in the plasma disk. Ions are heated from 1.5 to 6 keV between 15 and 30 RJ. Density and temperature are locally anti-correlated. Assumed to be related to centrifugal instabilities, cold, dense plasma are commonly observed near midnight. Plasma corotates around Jupiter and the rigid corotation breaks down outside 15–20 RJ. The plasma bulk velocity increases from the post-dusk sector to the pre-dawn sector featuring injection flows in the pre-dawn sector, which is consistent with the Vasyliunas cycle. Strong outflows (>100 km/s) are commonly observed outside 20 RJ and the average radial velocity increases with radial distance. The ion abundance changes between 10 and 18 RJ and that might indicate plasma sources and/or sinks near Europa and Ganymede. The vertical distribution of ions is controlled by the balance between centrifugal, pressure gradient, and ambipolar electric field forces. An example near the M-shell of 13.5 shows that average plasma temperature increases by a factor of 10 from the disk center to edge, because cold ions are more confined near the equator. Lighter ions with higher charge states have more mobility along the field line and have larger scale heights. The observations are compared with multi-species diffusive equilibrium model.","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141847003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Observations and Numerical Simulations of the Effects of the Gamma Ray Burst 221009A on the Lower Ionosphere 伽马射线暴 221009A 对低电离层影响的观测和数值模拟

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-23 DOI: 10.1029/2023JA031721

F. Kerrache, A. Ammar, R. Ikhlef, S. NaitAmor, Z. Bouyahiaoui, K. Daiffallah, S. Shehata, A. Shimeis

引用次数: 0

The Spatial Variation of Large- and Meso-Scale Plasma Flow Vorticity Statistics in the High-Latitude Ionosphere and Implications for Ionospheric Plasma Flow Models 高纬度电离层大尺度和中尺度等离子流涡度统计的空间变化及其对电离层等离子流模型的影响

IF 2.6 2区地球科学

Journal of Geophysical Research: Space Physics Pub Date : 2024-07-23 DOI: 10.1029/2024JA032887

G. Chisham, M. P. Freeman

{"title":"The Spatial Variation of Large- and Meso-Scale Plasma Flow Vorticity Statistics in the High-Latitude Ionosphere and Implications for Ionospheric Plasma Flow Models","authors":"G. Chisham, M. P. Freeman","doi":"10.1029/2024JA032887","DOIUrl":"10.1029/2024JA032887","url":null,"abstract":"The ability to understand and model ionospheric plasma flow on all spatial scales has important implications for operational space weather models. This study exploits a recently developed method to statistically separate large-scale and meso-scale contributions to probability density functions (PDFs) of ionospheric flow vorticity measured by the Super Dual Auroral Radar Network (SuperDARN). The SuperDARN vorticity data are first sub-divided depending on the Interplanetary Magnetic Field (IMF) direction, and the separation method is applied to PDFs of vorticity compiled in spatial regions of size 1° of geomagnetic latitude by 1 hr of magnetic local time, covering much of the high-latitude ionosphere in the northern hemisphere. The resulting PDFs are fit by model functions using maximum likelihood estimation (MLE) and the spatial variations of the MLE estimators for both the large-scale and meso-scale components are presented. The spatial variations of the large-scale vorticity estimators are ordered by the average ionospheric convection flow, which is highly dependent on the IMF direction. The spatial variations of the meso-scale vorticity estimators appear independent of the senses of vorticity and IMF direction, but have a different character in the polar cap, the cusp, the auroral region, and the sub-auroral region. The paper concludes by discussing the sources of the vorticity components in the different regions, and the consequences for the fidelity of ionospheric plasma flow models.","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JA032887","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141849212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0