Article(id=1281687957732049161, tenantId=1146029695717560320, journalId=1281212996840067084, issueId=1281687939268719086, articleNumber=null, orderNo=null, doi=10.11728/cjss2026.02.2025-0069, pmid=null, cstr=32142.14.cjss.2025-0069, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1745424000000, receivedDateStr=2025-04-24, revisedDate=1756396800000, revisedDateStr=2025-08-29, acceptedDate=null, acceptedDateStr=null, onlineDate=1783507821733, onlineDateStr=2026-07-08, pubDate=1773504000000, pubDateStr=2026-03-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1783507821733, onlineIssueDateStr=2026-07-08, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1783507821733, creator=13701087609, updateTime=1783507821733, updator=13701087609, issue=Issue{id=1281687939268719086, tenantId=1146029695717560320, journalId=1281212996840067084, year='2026', volume='46', issue='2', pageStart='265', pageEnd='566', issueExtLink='null', onlineDate='null', pubDate='1773504000000', pubDateStr='2026-03-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1783507817332, creator='13701087609', updateTime=1783508069046, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1281688995138605320, tenantId=1146029695717560320, journalId=1281212996840067084, issueId=1281687939268719086, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1281688995138605321, tenantId=1146029695717560320, journalId=1281212996840067084, issueId=1281687939268719086, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=290, endPage=299, ext={EN=ArticleExt(id=1281687957929181450, articleId=1281687957732049161, tenantId=1146029695717560320, journalId=1281212996840067084, language=EN, title=Case Comparative of Simultaneous Observations of Large-scale Traveling Thermospheric and Ionospheric Disturbances, columnId=1281687939994333679, journalTitle=Chinese Journal of Space Science, columnName=Research Article, runingTitle=null, highlight=null, articleAbstract=

To compare the propagation characteristics of Large-Scale Traveling Atmospheric Disturbances (LSTAD) and Large-Scale Traveling Ionospheric Disturbances (LSTID) that propagate in tandem in the thermosphere-ionosphere, this paper takes advantage of the CHAMP satellite’s ability to simultaneously observe atmospheric mass density and electron density across latitudes, studying a pair of LSTAD and LSTID events that propagated in tandem over long distances on 19 March 2002. Around 04:00-06:00 UT on 19 March, with a sudden and significant increase in the AE index, the CHAMP satellite observed the LSTAD and LSTID propagating in tandem in the Northern Hemisphere. Over the next approximately 6 h after 04:00 UT, these disturbances in atmospheric mass density and electron density propagated southward, crossed the equator, and entered the Southern Hemisphere, eventually dissipating there. On the other hand, the ground-based GNSS chain observations also confirmed the existence of the LSTID observed by the satellite. Through comparative analysis, it was found that due to the highly controlled movement of electrons by the Lorentz force while neutral particles are not constrained by it, the horizontal propagation speeds of LSTAD and LSTID along the meridian direction show significant differences. Therefore, at the same time and position on the same orbit, their phases are not the same and may even differ significantly.

, authors=Jianhong PAN1, Hongtao CAI2, Xu YAN2, Kun HU3, Lubing YANG2, Haiyin QING1, Shiwei ZHANG1, authorsList=Jianhong PAN, Hongtao CAI, Xu YAN, Kun HU, Lubing YANG, Haiyin QING, Shiwei ZHANG, authorCompany=null, correspAuthors=Hongtao CAI, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1281687959502045465, articleId=1281687957732049161, tenantId=1146029695717560320, journalId=1281212996840067084, language=CN, title=大尺度行进式热层与电离层扰动同步观测的事例对比, columnId=1281687940136940017, journalTitle=空间科学学报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=

为了对比热层–电离层中相伴传播的大尺度行进式大气层扰动与大尺度行进式电离层扰动的传播特征差异, 利用CHAMP卫星可以同时共体跨纬度观测大气质量密度和电子密度的优势, 研究了2002年3月19日一对远距离相伴传播的LSTAD与LSTID事件. 在当日04:00-06:00 UT期间, 伴随着AE指数的突然显著增强, CHAMP卫星随即在北半球观测到了相伴传播的LSTAD与LSTID. 在04:00 UT以后大约6 h内, 这些大气质量密度与电子密度的扰动一直向南传播, 穿过赤道并进入南半球, 最终在南半球耗散消失. 此外, 地面GNSS台链的观测结果也印证了卫星观测到的LSTID的真实存在. 经过对比分析表明, 由于电子运动受到洛伦兹力的高度控制, 而中性粒子不受洛伦兹力约束, 所以由同一源区激发且相伴传播的LSTAD与LSTID沿子午向的水平传播速度表现出明显差异, 导致在同一轨道上同一时刻同一位置二者的相位并不相同甚至差别明显.

, authors=潘建宏1, 蔡红涛2, 闫旭2, 胡坤3, 杨璐冰2, 青海银1, 张世炜1, authorsList=潘建宏, 蔡红涛, 闫旭, 胡坤, 杨璐冰, 青海银, 张世炜, authorCompany=null, correspAuthors=蔡红涛, authorNote=

潘建宏 男, 1992年4月出生, 现为乐山师范学院讲师, 主要从事电离层–热层耦合研究. E-mail:

蔡红涛 男, 1976年2月出生, 教授, 博士生导师, 主要从事电离层与磁层物理、空间探测与信息处理技术方向的研究.E-mail:

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潘建宏 男, 1992年4月出生, 现为乐山师范学院讲师, 主要从事电离层–热层耦合研究. E-mail:

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longitude variations of the piercing points of the corresponding stations (b) on 19 March 2002. 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Locations of ground-based GNSS receivers

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Site codeGeographic latitude and longitude
Shee51.264°N, 0.44°E
Hers50.86°N, 0.33°E
Chiz46.13°N, 0.41°W
Lliv42.28°N, 1.58°E
Bell41.35°N, 1.24°E
Vale39.48°N, 0.34°W
Alac38.34°N, 0.48°W
Alme36.51°N, 2.27°W
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GNSS地面台站的位置信息

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Site codeGeographic latitude and longitude
Shee51.264°N, 0.44°E
Hers50.86°N, 0.33°E
Chiz46.13°N, 0.41°W
Lliv42.28°N, 1.58°E
Bell41.35°N, 1.24°E
Vale39.48°N, 0.34°W
Alac38.34°N, 0.48°W
Alme36.51°N, 2.27°W
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大尺度行进式热层与电离层扰动同步观测的事例对比
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潘建宏 1 , 蔡红涛 2 , 闫旭 2 , 胡坤 3 , 杨璐冰 2 , 青海银 1 , 张世炜 1
空间科学学报 | 研究论文 2026,46(2): 290-299
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空间科学学报 |研究论文 2026 , 46 (2) : 290 -299
大尺度行进式热层与电离层扰动同步观测的事例对比
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潘建宏1 , 蔡红涛2 , 闫旭2, 胡坤3, 杨璐冰2, 青海银1, 张世炜1
作者信息
  • 1乐山师范学院电子信息与人工智能学院 乐山 614000
  • 2武汉大学地球与空间科学技术学院 武汉 430072
  • 3山东航空学院信息工程学院 滨州 256600
通讯作者:
蔡红涛 E-mail:
作者简介:

潘建宏 男, 1992年4月出生, 现为乐山师范学院讲师, 主要从事电离层–热层耦合研究. E-mail:

蔡红涛 男, 1976年2月出生, 教授, 博士生导师, 主要从事电离层与磁层物理、空间探测与信息处理技术方向的研究.E-mail:

Case Comparative of Simultaneous Observations of Large-scale Traveling Thermospheric and Ionospheric Disturbances
Jianhong PAN1 , Hongtao CAI2 , Xu YAN2, Kun HU3, Lubing YANG2, Haiyin QING1, Shiwei ZHANG1
Affiliations
  • 1College of Electronic Information and Artificial Intelligence, Leshan Normal University, Leshan 614000
  • 2School of Earth and Space Science and Technology, Wuhan University, Wuhan 430072
  • 3School of Information Engineering, Shandong University of Aeronautics, Binzhou 256600
出版时间: 2026-03-15 doi: 10.11728/cjss2026.02.2025-0069
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为了对比热层–电离层中相伴传播的大尺度行进式大气层扰动与大尺度行进式电离层扰动的传播特征差异, 利用CHAMP卫星可以同时共体跨纬度观测大气质量密度和电子密度的优势, 研究了2002年3月19日一对远距离相伴传播的LSTAD与LSTID事件. 在当日04:00-06:00 UT期间, 伴随着AE指数的突然显著增强, CHAMP卫星随即在北半球观测到了相伴传播的LSTAD与LSTID. 在04:00 UT以后大约6 h内, 这些大气质量密度与电子密度的扰动一直向南传播, 穿过赤道并进入南半球, 最终在南半球耗散消失. 此外, 地面GNSS台链的观测结果也印证了卫星观测到的LSTID的真实存在. 经过对比分析表明, 由于电子运动受到洛伦兹力的高度控制, 而中性粒子不受洛伦兹力约束, 所以由同一源区激发且相伴传播的LSTAD与LSTID沿子午向的水平传播速度表现出明显差异, 导致在同一轨道上同一时刻同一位置二者的相位并不相同甚至差别明显.

大尺度行进式大气层扰动  /  大尺度行进式电离层扰动  /  传播特征  /  同步观测

To compare the propagation characteristics of Large-Scale Traveling Atmospheric Disturbances (LSTAD) and Large-Scale Traveling Ionospheric Disturbances (LSTID) that propagate in tandem in the thermosphere-ionosphere, this paper takes advantage of the CHAMP satellite’s ability to simultaneously observe atmospheric mass density and electron density across latitudes, studying a pair of LSTAD and LSTID events that propagated in tandem over long distances on 19 March 2002. Around 04:00-06:00 UT on 19 March, with a sudden and significant increase in the AE index, the CHAMP satellite observed the LSTAD and LSTID propagating in tandem in the Northern Hemisphere. Over the next approximately 6 h after 04:00 UT, these disturbances in atmospheric mass density and electron density propagated southward, crossed the equator, and entered the Southern Hemisphere, eventually dissipating there. On the other hand, the ground-based GNSS chain observations also confirmed the existence of the LSTID observed by the satellite. Through comparative analysis, it was found that due to the highly controlled movement of electrons by the Lorentz force while neutral particles are not constrained by it, the horizontal propagation speeds of LSTAD and LSTID along the meridian direction show significant differences. Therefore, at the same time and position on the same orbit, their phases are not the same and may even differ significantly.

Large-Scale Traveling Atmospheric Disturbances (LSTAD)  /  Large-Scale Traveling Ionospheric Disturbances (LSTID)  /  Propagation characteristics  /  Simultaneous observations
潘建宏, 蔡红涛, 闫旭, 胡坤, 杨璐冰, 青海银, 张世炜. 大尺度行进式热层与电离层扰动同步观测的事例对比. 空间科学学报, 2026 , 46 (2) : 290 -299 . DOI: 10.11728/cjss2026.02.2025-0069
Jianhong PAN, Hongtao CAI, Xu YAN, Kun HU, Lubing YANG, Haiyin QING, Shiwei ZHANG. Case Comparative of Simultaneous Observations of Large-scale Traveling Thermospheric and Ionospheric Disturbances[J]. Chinese Journal of Space Science, 2026 , 46 (2) : 290 -299 . DOI: 10.11728/cjss2026.02.2025-0069
热层与电离层之间能量、动量的传输与交换是热层–电离层耦合过程的重要研究内容. 其中大尺度(波长>1000 km)行进式大气层扰动(Large-scale Traveling Atmospheric Disturbance, LSTAD)是热层–电离层间一种能量与动量交换及输运的重要物理过程[14], 在全球大气能量的传输与再分配过程中具有非常重要的作用[59]. 而行进式电离层扰动(Traveling Ionospheric Disturbance, TID)当前被学术界普遍解释为行进式大气层扰动(Traveling Atmosphere Disturbance, TAD)在电离层中引起的物理响应[10].
近百年来, 在这一领域开展了大量的理论研究和实验观测. 早期由于受到观测手段的限制, 首先探测到的是TID. 最早的观测可追溯到20世纪30年代. 后来Munro[11,12]在近10年内通过脉冲式电离层探测仪观测了14000余次电离层行进式扰动, 这些工作为证明TID的存在提供了大量可信的观测证据. 在接下来的半个世纪里, 对TID做了大量的实地观测和数值模拟[8], 针对TID从高纬极区向低纬区域的传播特征组织了多次大型国际联合观测[13,14]. 关于TID的形成机制, 1950年Martyn[15]提出TID与背景中性大气中的涡状波结构有联系, 这向揭示TID的物理本质方向跨出了一大步. Hines[10]提出了大气声重波理论, 认为TID是电离层对背景中性大气声重波的动力学响应, 这是迄今为止学术界对TID形成的物理机理最为广泛接受的解释.
近30年来, 由于大部分观测工作集中于电离层, 因此相关领域的研究主要集中于针对强地磁扰动期间TID的全球传播特征及其扰动源区物理机制的研究. Shiokawa等[16]利用MU雷达及其他观测手段, 分析了2001年3月31日的强磁暴主相期间在日本上空电离层观测到的TID的传播特征, 并对扰动激发源进行了理论探讨. Valladares等[17]通过全球GPS TEC观测数据分析了2003年10月强地磁暴期间南北半球同时观测到的TID, 发现南北半球观测到的TID在扰动幅度、水平传播速度与水平波长等方面存在明显差异. Ding等[18]对2003-2005年强磁暴期间LSTID在中纬度区域的传播特征做了大量统计分析, 其认为极光和地磁扰动对中纬度观测到的TID起着主要的控制作用. Zhou等[19]利用电离层多站高频返回式探测系统分析了在地磁平静期中低纬区域日侧观测到的LSTID事件. Ding等[20]利用GPS台网对比分析了亚洲和美洲上空观测到的LSTID传播特征的异同. 综上所述, 绝大多数观测分析工作均是试图通过对TID的观测分析实现间接了解TAD的目的. 近年来, 随着观测数据的日益丰富, 学术界对于TID的观测研究越来越多, 但是大多集中于对于观测到的TID事例的水平波长、传播周期、水平传播速度、传播方向、波前宽度等传播特征的简要报道[2123]以及部分激发原因的简要分析[24], 而对于TAD的观测研究相对较少, 更鲜有针对TAD与TID传播特征差异的对比分析.
20世纪在热层观测数据相对缺乏的情况下, 数值模拟为深化理解LSTAD与LSTID的传播特征发挥了重要作用. 例如, Richmond[25]、Millward等[26]Fuller-Rowell等[27]Fujiwara等[28]和Balthazor等[29]通过数值模拟方法研究了LSTAD/LSTID在各种强扰动期间的响应特征. Lu等[30]将基于真实观测数据驱动的高纬能量输入与电离层–热层动力学模型相结合, 较好地描述了暴时热层扰动和行进式电离层扰动的生成. Fujiwara 和 Miyoshi[31]利用全球大气环流模型(GCM)对强地磁扰动期间的LSTID响应特征进行了数值模拟. Qian等[32]通过数值模拟研究了LSTAD/LSTID对太阳耀斑的响应特征. 但大多数数值模拟聚焦于LSTAD/LSTID对极区假设能量输入的物理响应特征, 而不是以获得与实际观测特征相符合的理论计算结果为研究目的.
Shiokawa等[16]首次详细对比了数值模拟的LSTAD/LSTID与实际观测结果间的异同, 然而研究并未将LSTAD数值模拟结果与LSTID观测结果加以区分. 这就引出一个关键问题, 在同一个源区激发并相伴传播的过程中, 实际观测到的LSTAD与LSTID的响应特征与演化规律是否完全相同, 二者传播特征及其背后的物理机制是否存在差异.
本文利用近圆极轨卫星CHAMP能够同时共体大跨度探测热层/电离层密度的观测优势, 辅以地面台站对LSTID的观测结果, 并且结合相关地磁指数, 对比研究了一次极区激发的同时段相伴传播的LSTAD与LSTID传播特性的异同, 并且分析了二者传播特征差异的主要物理原因, 对于厘清LSTAD与LSTID的差异性具有重要的科学意义.
2000年7月15日, CHAMP卫星发射至470 km左右高度, 其轨道倾角为87.3°. 中性大气质量密度数据由STAR加速度仪测量算出, 时间分辨率为10 s; 电子密度由朗缪探针(PLP)测量得到, 时间分辨率为15 s. 为了消除因卫星运行过程中高度变化引起的密度起伏, 本文所用的大气质量密度与电子密度数据已分别根据MSISE[33]和IRI模型[34]归一化至400 km高度.
对于大气质量密度扰动的提取, 本文利用滑动平均去背景的方法得到[35,36], 分别对CHAMP卫星观测到的大气质量密度进行33/151个数据的滑动平均, 从而可以得到介于1300~5600 km尺度范围的大气密度扰动.
而对于电子密度扰动, 电离层赤道异常结构沿卫星轨道方向的空间尺度与LSTID波长可比拟. 以往有研究采用经验正交分解方法(EOF)成功地将卫星观测数据的时间/空间变化分离[20], 实际结果也表明, 采用EOF系列的前3阶分量, 通常可保留原始数据90%以上的信息. 但是由于本文所观测的LSTID出现在早上06:50 LT左右, 而此时赤道异常结构还未开始形成, 因此本文采用了滑动滤波方法去除背景电子密度.
获取每个轨道上的大气与电子密度相对扰动后, 研究根据卫星飞跃赤道附近的地方时, 将观测数据分为日侧/晨侧与夜侧/昏侧两部分; 根据世界时和地理纬度组织数据, 即可分别得到卫星在日侧/晨侧与夜侧/昏侧观测到的大气与电子密度扰动分布图. 若存在LSTAD/LSTID, 则大气质量/电子密度扰动分布图在连续轨道间会表现为随着纬度逐渐偏移的相似扰动.
图1给出了2002年3月18日21:00 UT至2002年3月19日23:00 UT的Kp指数与Dst指数变化情况, 在19日00:00-03:00 UT时段Kp指数为5, 在03:00-06:00 UT时段Kp指数为5+, 其中06:00 UT时, Dst指数达到了最小值–37 nT, 说明00:00-06:00 UT时段出现了一次小规模地磁暴, 而且正好出现在卫星所观察到的LSTAD与LSTID紧邻的前一时段(卫星观测到LSTAD与LSTID出现在05:00 UT以后), 地磁暴启动与LSTAD/LSTID在时序上先后依次出现.
图2给出了19日极光电集流指数日变化. 其显著特征是AE指数经历了2次快速增强, 其余时段内均不超过200 nT. AE指数的第一次增强发生在子夜00:00 UT以后, 从大约100 nT快速上升至500 nT左右, 大约持续了2.5 h; 第二次增强发生在04:00-06:00 UT之间, 迅速从300 nT上升至865 nT, 持续了2 h. AE指数的快速增强, 说明有大量来自磁层的能量进入地球电离层高度, 而且也正好发生在图3所示LSTAD与LSTID传播过程的前一时段.
图3给出了CHAMP卫星在2002年3月19日观测到的晨侧大气质量密度和电子密度的相对扰动情况. 黑色斜实线表示卫星轨道, 卫星观测到的LSTAD与LSTID的波峰与波谷沿经线方向(即子午向)的传播用黑色虚线箭头标出.
AE指数在04:00-06:00 UT快速增强(见图2), 此时CHAMP卫星还处于昏侧(大约18:50 LT)南半球. 大约04:21 UT, CHAMP越过南极进入了晨侧南半球, 如图3(a)第4根轨道底部所示, 向北半球飞行(见图3a中第4根轨道). 卫星在北半球观测到两个连续分布且显著的大气密度扰动的波峰与波谷, 如图3(a)所示; 扰动幅度随着纬度增加, 幅度较大的为波峰, 出现在75ºN附近. 随后, 卫星越过北极进入昏侧轨道. 大约在05:55 UT再次进入晨侧轨道(见图3a第5根轨道)后, CHAMP卫星再次遇见上述两个大气密度扰动, 只是相遇的纬度与上次相比, 表现出明显的南移. 在随后的第6根轨道上, 卫星第三次观测到波峰与波谷扰动, 此时波峰与波谷已经全部传播至南半球. 在第7次晨侧穿越过程中, 波峰移动到42°S左右并且继续传播至81°S (第8根轨道)附近; 到第7根轨道波谷几乎已经耗散消失.
图3中已用黑色虚线箭头将上述CHAMP卫星在晨侧第4根轨道以后飞越过程中观测到的大气密度的波峰与波谷串连起来. 由图3可知, 这些大气密度扰动随着时间沿子午向有规律地依次向南传播, 这是一个典型的LSTAD事件.
CHAMP卫星在上述飞行过程中, 其搭载的朗缪尔探针同时也观测到了电子密度类似的扰动特征, 如图3(b)所示. 值得注意的是, 与图3(a)不同, 图3(b)中正负相间的电子密度扰动的向南传播现象是从第5根轨道上才开始被观测到; 第4根轨道上仅观测到明显的密度增强, 但是从第4根到第5根轨道, 密度增强区并未表现出非常明显的向南传播, 这正是本次事件值得后文详细研究之处. 但在随后的连续3根轨道(图3b中第5至第7根轨道)上, 这些电子密度扰动也显示出依次规律地向南传播特征, 最终均越过赤道, 耗散在南半球. 黑色虚线也标识出了其在传播过程中被CHAMP卫星记录下的纬度轨迹; 同样也表现出明显有规律的向南偏移, 这是典型的LSTID传播特征.
综上所述, CHAMP卫星同时观测到了从北半球向南长距离传播的LSTAD与LSTID事件. 由此可以根据其密度扰动在卫星连续飞越地球上空期间的位置变化信息, 即图3(a)(b)中虚线箭头斜率, 估计出其沿卫星轨道方向的水平传播速度. 经计算, LSTAD的平均水平传播速度大约为870 m·s–1, 而LSTID仅约为436 m·s–1, 二者的平均水平传播速度表现出显著的差异, 其背后的原因值得关注研究.
综上CHMAP卫星观测到的LSTID同时也被地面GNSS台链观测到. 地面GNSS接收机被广泛用于LSTID的监测[3739]. 利用沿着子午方向分布的GNSS台链, 可以对LSTID传播特性展开有效监测[6]. 在CHAMP卫星04:00-10:00 UT期间飞越欧洲大陆上空过程中, 研究选取了若干个沿子午向分布的GNSS地面接收站组成观测链. 各台站的位置信息如表1所示, 这些GNSS接收站沿0°经线左右排列, 台站间子午向距离100~400 km范围内.
图4(a)图5(a)分别给出了上述GNSS接收台链与G05和G09卫星间的斜TEC (sTEC)扰动(sTECP), 图4(b)图5(b)给出了对应台站的穿刺点轨迹, 其中最北端的台站Shee与最南端的台站Alme, 二者纬度相差14.75°, 台站间地面南北距离大约为1638 km, 对应到400 km高度的南北距离大约为1742 km, 这足以观测LSTID在一个完整波长范围内的扰动.
图4可知, 正负相间的sTEC扰动在从北向南的各台站依次被观测到, 并且表现出波形相似、相位依次延后的周期性变化特征. 仔细对比各台站sTEC相位的变化, 不难看出其波峰与波谷均表现出明显的随时间向南移动, 如图4图5中黑色虚线所示. 这是典型的LSTID传播特征: 电子密度扰动从北半球高纬向赤道方向传播, 其sTEC扰动先被位于较高纬度的台站观测到, 然后依次在各台站上空留下了相似的扰动曲线, 并且波峰波谷出现时间依次延后.
利用各台站观测到的sTEC扰动的时间差, 可估算出LSTID的平均水平传播速度约为537 m·s–1, 虽然比CHAMP卫星观测估计的结果稍高, 但是仍明显低于LSTAD. 地面台链观测的LSTID的水平传播速度与卫星观测结果的差异, 可归因于探测方法的偏差. 由GPS卫星运动引起穿刺点的运动速度, 可达60~70 m·s–1[16].
地面GNSS台链的观测结果一方面印证了CHAMP卫星观测到LSTID存在的真实性, 同时也弥补了卫星在北半球更高纬度(Shee台站纬度约为51.3°N)对LSTID观测信息的缺失(见图3b), 这说明卫星观测到的LSTID来自更高的纬度区域. 结合Dst指数、AE指数在04:00-06:00 UT增强与卫星随后在05:00-09:00 UT观测到LSTAD与LSTID的先后顺序, 可以推测在04:00-06:00 UT时段, 随着磁层能量进入昏侧极光椭圆区(AE指数的突然增强), 中性大气/电子密度先后对此次能量输入做出响应. 在极区晨侧或昏侧被激发的LSTAD与LSTID一部分直接向低纬区域传播, 可能还有一部分向更高纬度方向传播, 最终越过极盖区到达昏侧或晨侧再向低纬区域传播, 总之, 在经过欧洲大陆上空过程中被CHAMP卫星和地面GNSS台链观测到. Cai等[5]分析了夜侧激发的LSTID向极区传播, 然后越过夜侧极盖到达日侧中纬度地区的观测事例.
综上分析CHAMP卫星同时观测到了LSTAD与LSTID事件, 这些事件是热层与电离层对04:00-06:00 UT极区能量输入的物理响应, 在大约05:00-10:00 UT时段, 卫星观测到大气密度/电子密度扰动, 极区能量注入与热层/电离层扰动在时序上的先后有序说明他们极有可能源自同一个激发过程. 并且由于卫星观测在时间与空间上均是跳跃式的观测, 相邻轨道的时间相差大约93 min, 经度相差约23°, 所以LSTAD与LSTID实际的开始(结束)时间可能比卫星观测到的开始(结束)时间更早(更晚); 空间上, 实际波前宽度的经度范围可能比卫星观测到的经度范围向东、向西两侧更宽一些. 此外, 地面的GNSS台站在同一时段同一经纬度区域也观测到向南传播的LSTID (见图4图5), 这更加印证了图3中卫星观测到的LSTID是真实存在的.
图3结果清晰表明, 随着AE指数的突然增强, CHAMP卫星先后在北半球观测到LSTAD与LSTID. 在随后约6 h的时间里, 这些大气/电子密度扰动继续向南传播, 穿过赤道进入南半球, 最终在南半球耗散消失. 这次同时间段且同空间范围远距离传播的LSTAD与LSTID事例, 提供了一次较好的对比二者传播特征的机会.
AE指数的突然增强说明有磁层能量进入极区电离层高度(见图2图3). 随后, 从第4根轨道开始CHAMP卫星在北半球极区观测到了大气密度增强, 以及后续引发的沿经线方向正负相间的中性密度扰动, 并且在后续轨道依次南移; 在第4根轨道高纬区域CHAMP卫星也观测到了明显的电子密度正负扰动, 只是从第4根轨道至第5根轨道未观测到高纬区域电子密度扰动的明显南移, 从第5根轨道往后才明显观测到电子密度扰动的依次逐渐南移. 值得注意的是, 电离层此时段(第4根轨道在北半球高纬的时间大约为04:50 UT)在高纬区域响应的LSTID被地面GNSS台链在稍低纬度区间上(38°N-51°N)记录下来(见图4), 因为从图4可以看出早在04:00 UT以后, 51.3°N附近的Shee与Hers台站已经观测到了北半球的LSTID.
图3所示虚线箭头的斜率可以明显看出, LSTAD的水平传播速度明显大于LSTID的水平传播速度, 而对于一列单频波在某一时刻、空间某个位置的相位既与时间角频率(单位时间对应的相位差)有关, 也与波数(相当于空间角频率, 即沿着传播方向单位距离对应的相位差)有关, 所以观测到的LSTAD与LSTID水平传播速度(实际观测值为多频波的群速度)的明显差异说明二者即便是同一源区激发, 在传播过程中同一时刻同一位置的相位也并不相同, 甚至相差较大, 这从CHAMP卫星观测到的同一轨道上LSTAD与LSTID水平波长的明显差异也可以看出来.
从动力学角度分析, 在F层高度, 电子的碰撞频率远远小于其磁回旋频率, 所以电子运动主要受磁力线控制, 满足“磁冻结”近似, 而不能像中性粒子一样自由地横越磁力线, 中性大气粒子的运动却不受磁场约束. 如果假定LSTAD与电离层相互作用的结果仅使电离层等离子体发生运动且LSTAD受到阻尼的话, 则LSTAD引起等离子体的速度方向应沿着当地磁力线. 这样, 当LSTAD的播方向与磁力线存在一定夹角时, 观测到的LSTAD和LSTID的水平传播速度应存在差异[1], 本文卫星的观测结果正好证实了这种猜测. 二者间的详细关系需综合考虑热层–电离层间复杂的非线性耦合过程深入研究.
另外, 从扰动幅度上看, 由于背景电子密度远小于中性粒子密度, 电子密度扰动的相对幅度通常高于同时观测到的中性粒子密度扰动的相对幅度.
图3白色箭头所示, 在第4根轨道上, CHAMP卫星观测到了明显的电子密度增强, 纬度约为43°N, 并且结合地面台站观测数据分析可知, 此纬度处存在LSTID (图4中从空间上看Shee台站在51°N处均观测到了与低纬度台站相似的扰动波形); 从时间上看, 地面台站在04:00-06:00 UT期间也观测到了LSTID (见图4图5), 因此可以肯定图3中纬度上大约60°N-40°N范围内, 时间上大约04:50-06:30 UT时间段(图3中白色箭头所示)存在LSTID. 由此可见, 本文所述LSTAD与LSTID所存续的时间区间、空间范围高度吻合. 但是地面台站在04:00-06:00 UT、北纬50°高纬区域观测到了电子密度扰动, 而卫星却未观测到LSTID在高纬区域明显的水平南移迹象(如图3b白色箭头所示, 第4根轨道与第5根轨道之间电子密度增强南移不明显). 结合前文分析可知, 带电粒子运动受到磁力线的约束, 而中性成分却不受其约束, 并且在卫星所在高度处(大约412 km), 电子的磁回旋频率远远大于中性粒子和电子的碰撞频率, 因此电离层的电子运动受洛伦兹力的高度控制. 在纬度50°以上的高纬区域, 磁力线近似与地面垂直, 且磁回旋频率远远大于碰撞频率, 电子的运动主要沿磁力线方向, 因此沿水平方向跨纬度的运动(子午向运动)并不明显. 而到了中低纬度地区, 磁力线倾斜40°甚至更低, 水平方向的运动逐渐明显, 开始明显被卫星观察到. 所以图3中白色箭头所示无明显南移的观测结果, 进一步印证了前文对于LSTAD与LSTID水平传播速度差异的解释.
2002年3月19日, 磁层能量进入极区电离层高度后激发的LSTAD与LSTID在晨侧被CHAMP卫星同步观测到. 地面GNSS台链观测结果验证了卫星观测到的LSTID真实存在. LSTAD与LSTID在北半球被激发后, 一直向南传播, 最终越过赤道, 耗散于南半球.
通过CHAMP的观测数据计算, LSTAD与LSTID被同一源区激发后, 在水平方向上各自独立传播, 并且LSTAD的水平传播速度要明显高于LSTID, 所以二者在同一时刻同一位置的相位并不相同, 甚至差别明显; 由于带电粒子运动受到磁力线约束, 而高纬区域磁力线与水平方向夹角太大, 所以高纬区域卫星观测到的LSTID水平移动并不明显.

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doi: 10.11728/cjss2026.02.2025-0069
  • 接收时间:2025-04-24
  • 首发时间:2026-07-08
  • 出版时间:2026-03-15
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  • 收稿日期:2025-04-24
  • 修回日期:2025-08-29
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    1乐山师范学院电子信息与人工智能学院 乐山 614000
    2武汉大学地球与空间科学技术学院 武汉 430072
    3山东航空学院信息工程学院 滨州 256600

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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