Journal of Atmospheric and Solar-Terrestrial Physics最新文献

{"title":"Statistical analysis on orographic atmospheric gravity wave and sporadic E layer","authors":"Yi Liu ,&nbsp;Zhou Chen ,&nbsp;Zhiqiang Fan ,&nbsp;Chen Zhou ,&nbsp;Xiang Wang ,&nbsp;Yuqiang Zhang ,&nbsp;Yufeng Zhou ,&nbsp;Ting Lan ,&nbsp;Haiyin Qing","doi":"10.1016/j.jastp.2024.106256","DOIUrl":"https://doi.org/10.1016/j.jastp.2024.106256","url":null,"abstract":"<div><p>In this study, we present the statistical features of gravity wave (GW) and sporadic E layer (E_S) by using the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) data aboard the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite and Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) radio occulation measurements during 2007–2018. Statistical analysis of occurrences of GW and E_S shows that daytime GW and E_S are frequently observed on the eastern sides of the Tibetan plateau during summer, while less consistency between nighttime GW and E_S occurrences was presented in our observations. The concurrence of GW and E_S shows that nearly 60% E_S occurred simultaneously with local strong GW occurrence. These results provide observational evidence suggesting that the effect of strong GW activities is significant in the generation of E_S.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140948370","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}

{"title":"Terrestrial and Martian space weather: A complex systems approach","authors":"Abraham Chian ,&nbsp;Rodrigo Miranda ,&nbsp;Cesar Bertucci ,&nbsp;Xóchitl Blanco-Cano ,&nbsp;Joe Borovsky ,&nbsp;Sergio Dasso ,&nbsp;Ezequiel Echer ,&nbsp;Adriane Franco ,&nbsp;Kirolosse M. Girgis ,&nbsp;J. Américo González-Esparza ,&nbsp;Tohru Hada ,&nbsp;Hiroshi Hasegawa ,&nbsp;Syau-Yun Hsieh ,&nbsp;Primoz Kajdič ,&nbsp;Christian Mazelle ,&nbsp;Erico Rempel ,&nbsp;Diana Rojas-Castillo ,&nbsp;Beatriz Sánchez-Cano ,&nbsp;David Sibeck ,&nbsp;Marina Stepanova ,&nbsp;Juan Valdivia","doi":"10.1016/j.jastp.2024.106253","DOIUrl":"10.1016/j.jastp.2024.106253","url":null,"abstract":"<div><p>A comparative overview of Terrestrial and Martian space weather is presented, with emphasis on applying the tools of complexity and nonlinear dynamics to study the spatiotemporal dynamics and structures of sun–Earth and sun–Mars space environment. The following topics are reviewed: (1) complex systems approach to solar atmosphere and solar wind; (2) complex systems approach to planetary bow shock and magnetosphere–ionosphere; (3) Martian space weather, bow shock, and magnetosphere–ionosphere; (4) imaging planetary magnetosphere–ionosphere.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1364682624000816/pdfft?md5=f620d9c02409c8fd0ae10a9c20e3f262&pid=1-s2.0-S1364682624000816-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141047360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Very high frequency radiation emitted by negative narrow bipolar events occurred over malacca strait","authors":"Shamsul Ammar Shamsul Baharin ,&nbsp;Mohd Riduan Ahmad ,&nbsp;Muhammad Haziq Mohammad Sabri ,&nbsp;Vernon Cooray","doi":"10.1016/j.jastp.2024.106252","DOIUrl":"https://doi.org/10.1016/j.jastp.2024.106252","url":null,"abstract":"<div><p>In this paper, Very-High Frequency (VHF) radiation pulses associated with 11 negative Narrow Bipolar Events (NBEs) produced by a tropical storm over Malacca Strait are examined. The lightning data were recorded from a measurement station (ST) which consisted of a fast antenna (FA) and three VHF sensors (two 5 m perpendicular baselines interferometer). The average rise time (RT), average zero-crossing time (ZCT), average pulse duration (PD), and range of peak currents of the negative NBEs were 1.4 ± 0.4 μs, 2.7 ± 1.0 μs, 12.0 ± 6.9 μs, and −10 to −64 kA, respectively. The key finding is that all VHF radiation pulses have been found to precede the negative NBEs with an average lead time of 0.7 ± 0.3 μs. An interferometer map for one negative NBE (labelled as NBE10) detected at 35.7 km from ST has shown a characteristic of mixed propagation direction of fast streamers. The first VHF radiation source was detected at 12.4 ± 0.4 km above sea level. The total length and estimated velocity of the main propagation of the VHF radiation sources were 2.2 ± 0.7 km and between 1.4 × 10⁸ and 2.8 × 10⁸ ms⁻¹, respectively. Moreover, based on the Himawari satellite image, the maximum extent of the cloud top height was estimated to be around 20.9 km over sea level (over Malacca Strait). All the VHF radiation sources associated with NBE10 were suggested to be detected above the main negative charge region (6 km altitude that corresponds to −10 °C). Thus, it could be suggested that NBE10 was initiated most likely in the environment of the ice crystals alone, based on the first altitude of the VHF radiation source and maximum extent of cloud top height.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140910330","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}

{"title":"Evaluation of dB/dt amplitudes and sources over the Brazilian region during geomagnetic storms in the 2021–2022 biennium","authors":"G.B.D. Silva ,&nbsp;L.R. Alves ,&nbsp;K.V. Espinosa ,&nbsp;V.M. Souza ,&nbsp;L.A. da Silva ,&nbsp;J.E.R. Costa ,&nbsp;M.B. Pádua ,&nbsp;S.A. Sanchez","doi":"10.1016/j.jastp.2024.106196","DOIUrl":"10.1016/j.jastp.2024.106196","url":null,"abstract":"<div><p>The rate of change of the geomagnetic field (<span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span>) observed at Earth’s surface has been used as a proxy of geomagnetically induced currents, which are known to be hazardous for grounded technological systems such as high-voltage power grid systems. The <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> rates have been well characterized in the high latitude region (<span><math><mrow><mo>≳</mo><mn>60</mn><mo>°</mo></mrow></math></span>), but much less information is available for the low latitudes to date. To overcome this limitation, we have examined <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> rates on the <span><math><mi>H</mi></math></span> component of the geomagnetic field as measured by an array of stations operated by the EMBRACE Magnetometer Network in Brazil. The main focus is to characterize <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> occurrence at very low latitudes (<span><math><mrow><mo>≲</mo><mn>22</mn><mo>°</mo></mrow></math></span>) of the Brazilian peculiar territory, whose magnetic measurements are influenced by the equatorial electrojet and the presence of the South Atlantic Magnetic Anomaly (SAMA). The period investigated is from 2021 to 2022, over the ascending phase of the solar cycle 25. The statistical analysis demonstrates that <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> peak magnitudes are generally below 0.5 nT/s during magnetic storms, and exhibit a dependence on the solar cycle for the station near the center of the SAMA. However, we obtain for a particular case in 2021 that <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> reached 1.35 nT/s in magnitude at the magnetic equator during daytime, which is a significant value even for higher latitudes. A case study of the induced geoelectric fields during this event shows that the conductivity structure beneath two compared sites plays a major role in the amplitude of such fields than <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> amplitude. Also, the MLT distributions of <span><math><mrow><mi>d</mi><mi>B</mi><mo>/</mo><mi>d</mi><mi>t</mi></mrow></math></span> indicate that ultra-low frequency waves can be a major source of these signals in lower latitudes.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1364682624000245/pdfft?md5=927fa34b9520803ef821e3ccd2628cda&pid=1-s2.0-S1364682624000245-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140047176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uncovering the dynamics of atmospheric aerosols in China: A comprehensive analysis of OMI-Retrieved aerosol index data","authors":"Muhammad Khan ,&nbsp;Salman Tariq","doi":"10.1016/j.jastp.2024.106251","DOIUrl":"https://doi.org/10.1016/j.jastp.2024.106251","url":null,"abstract":"<div><p>China faces severe atmospheric problems due to the rapid increase in population and industrialization. Therefore, due to the insufficient number of monitoring stations in such a vast country, remote sensing of an ultraviolet aerosol index (UVAI) provides useful information about absorbing aerosols. This study used the OMI-retrieved UVAI data to investigate the spatial patterns, trends, and periodic nature of UVAI over China from October 2004 to December 2022. Additionally, the correlation and degree of coherence of UVAI with meteorological parameters (temperature &amp; precipitation) and anthropogenic factors (Construction, population, CO₂ emission, energy consumption, and primary industry) are also examined. Mean UVAI concentration with an increasing trend of 4.34% per year shows high UVAI values (0.70–1.41) in Xinjiang Uygar followed by Heilongjiang, Jilin, Liaoning, Shandong, Beijing, Hubei, and some northern regions i.e., Gansu, Qinghai, and western Nel Mongol. Seasonally, Xinjiang Uygur experiences high UVAI (&lt;1.52) values during all four seasons with the dominance of both fine and coarse mode particles. Moreover, Hubei, Gansu, Jilin, Shandong, and Xinjiang Uygar experiences high UVAI values i.e. 2.55, 2.05, 1.87, 2.82, 2.27 during 2021 with an increasing trend of 5.50% year⁻¹, 5.43% year⁻¹, 3.82% year⁻¹, 4.73% year⁻¹, and 9.33% year⁻¹ respectively. The HYSPLIT backward trajectories plotted at altitudes of 50m, 100m, and 500m indicate the dominance of desert dust over Jinan, Urumqi, and Lanzhou while anthropogenic pollutants over Wuhan and Changchun. Wavelet coherence (WTC) shows the positive correlation of UVAI with temperature and precipitation. Moreover, the co-variability of absorbing aerosols with anthropogenic and natural factors is also inculcated in this study. Considering the outcomes of this study it will help policymakers to analyze the variability of absorbing aerosols in China and different methods like plantation of more trees, efficient fuel consumption, and promotion of public transport, etc., can be used to reduce air pollution.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140823128","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}

{"title":"Influence of temperature changes and vertically transported trace species on the structure of MLT region during major SSW events","authors":"Akash Kumar ,&nbsp;M.V. Sunil Krishna ,&nbsp;Alok Kumar Ranjan ,&nbsp;Stefan Bender ,&nbsp;Miriam Sinnhuber ,&nbsp;Sumanta Sarkhel","doi":"10.1016/j.jastp.2024.106243","DOIUrl":"https://doi.org/10.1016/j.jastp.2024.106243","url":null,"abstract":"<div><p>Sudden stratospheric warming (SSW) events are large-scale dynamic phenomena which can significantly affect the circulation, temperature, and composition of different atmospheric layers. The circulation changes during these events induce variations in the atmospheric neutral and ion densities and cause the vertical transport of various trace species. The severity of effects induced by major SSW events in the mesosphere and lower thermosphere (MLT) region has received less attention than that in the lower atmosphere. The major influence of temperature and vertically transported trace species on the energetics, thermal and compositional structure of the MLT region has been investigated during two major SSW events with elevated stratopause. Variations in the nitric oxide volume emission rates (NO-VER), a measure of infrared radiative cooling by NO, are reported for the first time in the context of the dynamical changes during SSW events. This study investigates the role of temperature and NO variability on the energetics of the MLT region, particularly during the formation of elevated stratopause. The effects of supplemented NO density on the secondary ozone layer has also been investigated during these events, the anti-correlation between secondary ozone and NO does not conclude on the role of NO in the secondary ozone peak density variations. Notwithstanding the similarity in terms of defining characteristics, both SSW events impact the secondary ozone layer differently. In contrast to earlier studies, it is suggested that along with temperature, the availability of atomic oxygen is the major factor for the observed variation in secondary ozone during the SSW events.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140901340","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}

{"title":"A comparison of Forbush Decreases driven by ICMEs and SIRs","authors":"C. Gutierrez ,&nbsp;S. Dasso ,&nbsp;P. Démoulin ,&nbsp;M. Janvier","doi":"10.1016/j.jastp.2024.106232","DOIUrl":"https://doi.org/10.1016/j.jastp.2024.106232","url":null,"abstract":"<div><p>Solar wind structures passing Earth can shield Earth from Galactic Cosmic Rays (GCRs), producing variations in the GCR flux that can be observed by ground-based detectors. In this paper we study the differences of Forbush decreases (FDs) produced by Interplanetary Coronal Mass Ejections (ICMEs) and Stream Interaction Regions (SIRs), applying a superposed epoch technique to large samples of FDs associated with ICMEs and SIRs. The analysis of the GCRs flux is made using data from neutron monitors at an Antarctic station (McMurdo). We also study the dependence of the FD properties with the bulk velocity of ICMEs/SIRs. We confirm that the faster ICMEs cause the largest FDs. In contrast, the FD intensity in SIRs is weakly dependent of the bulk velocity. Indeed, we find that ICMEs and SIRs with similar solar wind velocity produce very different FDs. This points for a dominant role of the magnetic field in screening GCRs. Finally, we find that in ICMEs the minimum GCR flux is usually observed close to the beginning of the magnetic ejecta, while in SIRs this is usually at the trailing edge.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140880216","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}

{"title":"Noctilucent clouds altitude and particle size mapping based on spread observations by ground-based all-sky cameras","authors":"Oleg S. Ugolnikov","doi":"10.1016/j.jastp.2024.106242","DOIUrl":"https://doi.org/10.1016/j.jastp.2024.106242","url":null,"abstract":"<div><p>We suggest the procedure of building the maps of noctilucent clouds (NLC) zonal and meridional velocity, mean altitude and particle size based on three-color photometry by identical all-sky RGB-cameras separated by 115 km in a close-meridional direction. The procedure is applied to the bright NLC event on July 3, 2023. The altitude is measured by precise triangulation technique, and effective particle radius is estimated by comparison of each definite NLC fragment intensity and colors at different scattering angles as it is registered from different observation sites. The results are compared with existing photometric methods for average altitude and particle size measurements. A significant difference in evening and morning twilight NLC parameters is found, which is discussed in comparison with existing analysis of diurnal NLC variations.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140815844","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}

{"title":"Variability of the equatorial ionization anomaly over the South American sector: Effects of electric field and effective meridional wind","authors":"Solomon Otoo Lomotey ,&nbsp;Jonas Rodrigues de Souza ,&nbsp;Cristiano Max Wrasse ,&nbsp;Hisao Takahashi ,&nbsp;Diego Barros ,&nbsp;Cosme Alexandre Oliveira Barros Figueiredo ,&nbsp;José Humberto Andrade Sobral ,&nbsp;Fábio Egito ,&nbsp;Patrick Essien ,&nbsp;Toyese Tunde Ayorinde ,&nbsp;Anderson Vestena Bilibio ,&nbsp;Nana Ama Browne Klutse","doi":"10.1016/j.jastp.2024.106240","DOIUrl":"10.1016/j.jastp.2024.106240","url":null,"abstract":"<div><p>Vertical Total Electron Content (VTEC) Maps over the South American Continent were utilized to investigate the temporal and longitudinal climatology of Equatorial Ionization Anomaly (EIA) using more than 350 Global Navigation Satellite Systems (GNSS) receivers. At a temporal resolution of 10 min, the EIA motions, morphologies, and evolutions were mapped using VTEC keogram along magnetic meridians lines. Between 2014 and 2019, characteristics of the EIA were studied at two different South American magnetic meridians (i.e., <span><math><mrow><mn>3</mn><mo>.</mo><mn>36</mn><mo>°</mo></mrow></math></span> E and <span><math><mrow><mn>7</mn><mo>.</mo><mn>58</mn><mo>°</mo></mrow></math></span> E) separated by <span><math><mrow><mo>∼</mo><mn>555</mn></mrow></math></span> km at an altitude of 300 km. The aim of this study is to examine the EIA’s variability, monthly variations and occurrences at evenly spaced longitudinal sectors. The effects of effective meridional winds component and <span><math><mi>E × B</mi></math></span> drift velocity on the daytime asymmetry of EIA anomalies were studied using a physics-based numerical model, Sheffield University Plasmasphere-Ionosphere model at Instituto Nacional de Pesquisas Espaciais (SUPIM-INPE). We found that the EIA parameters such as strength, shape, intensity, and latitudinal positions are affected by the eastward electric field and effective meridional wind. The monthly variations in the EIA over two magnetic meridian sectors demonstrate a semiannual variation. The EIA crests were more symmetric in equinox than in solstice seasons. The asymmetries of the EIA observed during the December solstice are more intense than during the June solstice, whereas September equinox is less symmetric than March equinox seasons. Moreover, this study indicates that the vertical drift and the meridional neutral wind plays a very significant role in the development of the EIA asymmetry by transporting the plasma up the field lines. There was a notable contraction of the EIA southern hemispheric (SH) crests from the December solstice to the June solstice. Meanwhile, the EIA crest positions in the northern hemisphere (NH) expand from the December solstice to the June solstice. According to our observations, the March equinox season had the most EIA occurrences, which were then followed by the September equinox, the December and June solstices. The intensities of the EIA crests also considerably decreased with solar descending phases. Through modeling, this work provides the scientific community with new insights into the evolution/development of EIA and their latitudinal asymmetry, as well as the role of <span><math><mi>E × B</mi></math></span> drift and thermospheric neutral wind in assessing the statistical analysis of EIA variability using the largest VTEC database over the South American sector.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140757730","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}

{"title":"Ionospheric behaviors and characteristics in Asian sector during the April 2023 geomagnetic storm with multi-instruments observations","authors":"Linlin Li ,&nbsp;Shuanggen Jin","doi":"10.1016/j.jastp.2024.106238","DOIUrl":"10.1016/j.jastp.2024.106238","url":null,"abstract":"<div><p>Geomagnetic storms frequently affect satellite navigation, communication and satellite orbits. Monitoring and understanding the ionospheric disturbances and responses to geomagnetic storms are crucial. The detailed ionospheric responses and physical mechanisms to various geomagnetic storms, however, have not yet been extensively studied. In this paper, the ionospheric variation behaviors and features following the April 2023 magnetic storm along the Asian sector are thoroughly studied using multi-instrument observation data, including the Global Navigation Satellite System (GNSS), ionosonde, and other satellites. Large-scale Traveling Ionospheric disturbances (LSTIDs) are observed from BeiDou Geostationary Earth Orbit (GEO) satellites, GPS and GLONASS. LSTIDs traveled with a speed of 760–1300 m/s from high latitude region to low latitude region with a period of about 40 min. The equatorial propagating LSTIDs were generated by coronal mass ejections (CMEs), which occurred in April 2023 with periodic energy input from the auroral area. The poleward LSTIDs are also observed with a velocity of approximately 600–750 m/s and the period is similar. Neutral wind also influenced the characteristics of the ionospheric response. The <span><math><mrow><mrow><mo>[</mo><mi>O</mi><mo>]</mo></mrow><mo>/</mo><mrow><mo>[</mo><msub><mi>N</mi><mn>2</mn></msub><mo>]</mo></mrow></mrow></math></span> ratio declined during the storm, which led to the formation of the negative storm phases. The largest vertical total electron content (VTEC) is found, and the strengthened region of TEC is mainly centered between ± 20° within geographical latitude. Equatorial Ionospheric Anomaly (EIA) is also observed, which is probably influenced by the electric field. As the time goes on, the peak on the south side of the EIA is disappearing. Meanwhile, the height of the ionospheric maximum electron density rises, and the electron density falls.</p></div>","PeriodicalId":15096,"journal":{"name":"Journal of Atmospheric and Solar-Terrestrial Physics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140761371","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}