{"title":"太阳耀斑引起的低频和低频无线电信号测量振幅和相位扰动的比较研究","authors":"D. Šulić, V. Srećković","doi":"10.2298/SAJ1488045S","DOIUrl":null,"url":null,"abstract":"Very Low Frequency (VLF) and Low Frequency (LF) signal perturbations were \n examined to study ionospheric disturbances induced by solar X-ray flares in \n order to understand processes involved in propagation of VLF/LF radio signals \n over short paths and to estimate specific characteristics of each short path. \n The receiver at the Belgrade station is constantly monitoring the amplitude \n and phase of a coherent and subionospherically propagating LF signal operated \n in Sicily NSC at 45.90 kHz, and a VLF signal operated in Isola di Tavolara \n ICV at 20.27 kHz, with the great circle distances of 953 km and 976 km, \n respectively. A significant number of similarities between these short paths \n is a direct result of both transmitters and the receiver’s geographic \n location. The main difference is in transmitter frequencies. From July 2008 \n to February 2014 there were about 200 events that were chosen for further \n examination. All selected examples showed that the amplitude and phase of VLF \n and LF signals were perturbed by solar X-ray flares occurrence. This six-year \n period covers both minimum and maximum of solar activity. Simultaneous \n measurement of amplitude and phase of the VLF/LF signals during a solar flare \n occurrence was applied to evaluate the electron density profile versus \n altitude, to carry out the function of time over the middle Europe. [Projekat \n Ministarstva nauke Republike Srbije, br. 176002 i br. III4402]","PeriodicalId":48878,"journal":{"name":"Serbian Astronomical Journal","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2014-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"25","resultStr":"{\"title\":\"A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares\",\"authors\":\"D. Šulić, V. Srećković\",\"doi\":\"10.2298/SAJ1488045S\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Very Low Frequency (VLF) and Low Frequency (LF) signal perturbations were \\n examined to study ionospheric disturbances induced by solar X-ray flares in \\n order to understand processes involved in propagation of VLF/LF radio signals \\n over short paths and to estimate specific characteristics of each short path. \\n The receiver at the Belgrade station is constantly monitoring the amplitude \\n and phase of a coherent and subionospherically propagating LF signal operated \\n in Sicily NSC at 45.90 kHz, and a VLF signal operated in Isola di Tavolara \\n ICV at 20.27 kHz, with the great circle distances of 953 km and 976 km, \\n respectively. A significant number of similarities between these short paths \\n is a direct result of both transmitters and the receiver’s geographic \\n location. The main difference is in transmitter frequencies. From July 2008 \\n to February 2014 there were about 200 events that were chosen for further \\n examination. All selected examples showed that the amplitude and phase of VLF \\n and LF signals were perturbed by solar X-ray flares occurrence. This six-year \\n period covers both minimum and maximum of solar activity. Simultaneous \\n measurement of amplitude and phase of the VLF/LF signals during a solar flare \\n occurrence was applied to evaluate the electron density profile versus \\n altitude, to carry out the function of time over the middle Europe. [Projekat \\n Ministarstva nauke Republike Srbije, br. 176002 i br. III4402]\",\"PeriodicalId\":48878,\"journal\":{\"name\":\"Serbian Astronomical Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.8000,\"publicationDate\":\"2014-04-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"25\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Serbian Astronomical Journal\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.2298/SAJ1488045S\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Serbian Astronomical Journal","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.2298/SAJ1488045S","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 25
摘要
为了了解甚低频(VLF) /低频(LF)无线电信号在短路径上传播的过程,并估计每个短路径的具体特征,研究了太阳x射线耀斑引起的电离层扰动。贝尔格莱德站的接收机持续监测西西里岛NSC运行频率为45.90 kHz的相干和亚层传播低频信号和Isola di Tavolara ICV运行频率为20.27 kHz的低频信号的振幅和相位,大圆距离分别为953 km和976 km。这些短路径之间的大量相似之处是发射器和接收器地理位置的直接结果。主要区别在于发射频率。从2008年7月到2014年2月,大约有200个项目被选中进行进一步的检查。所选的例子表明,太阳x射线耀斑的发生对低频和低频信号的幅值和相位产生了扰动。这6年期间包括太阳活动的最小值和最大值。在太阳耀斑发生期间,同时测量VLF/LF信号的振幅和相位,以评估电子密度分布与高度的关系,从而在中欧地区进行时间函数。[南斯拉夫]塞族共和国部长项目;[176002 .]III4402]
A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares
Very Low Frequency (VLF) and Low Frequency (LF) signal perturbations were
examined to study ionospheric disturbances induced by solar X-ray flares in
order to understand processes involved in propagation of VLF/LF radio signals
over short paths and to estimate specific characteristics of each short path.
The receiver at the Belgrade station is constantly monitoring the amplitude
and phase of a coherent and subionospherically propagating LF signal operated
in Sicily NSC at 45.90 kHz, and a VLF signal operated in Isola di Tavolara
ICV at 20.27 kHz, with the great circle distances of 953 km and 976 km,
respectively. A significant number of similarities between these short paths
is a direct result of both transmitters and the receiver’s geographic
location. The main difference is in transmitter frequencies. From July 2008
to February 2014 there were about 200 events that were chosen for further
examination. All selected examples showed that the amplitude and phase of VLF
and LF signals were perturbed by solar X-ray flares occurrence. This six-year
period covers both minimum and maximum of solar activity. Simultaneous
measurement of amplitude and phase of the VLF/LF signals during a solar flare
occurrence was applied to evaluate the electron density profile versus
altitude, to carry out the function of time over the middle Europe. [Projekat
Ministarstva nauke Republike Srbije, br. 176002 i br. III4402]
期刊介绍:
Serbian Astronomical Journal publishes original observations and researches in all branches of astronomy. The journal publishes:
Invited Reviews - review article on some up-to-date topic in astronomy, astrophysics and related fields (written upon invitation only),
Original Scientific Papers - article in which are presented previously unpublished author''s own scientific results,
Preliminary Reports - original scientific paper, but shorter in length and of preliminary nature,
Professional Papers - articles offering experience useful for the improvement of professional practice i.e. article describing methods and techniques, software, presenting observational data, etc.
In some cases the journal may publish other contributions, such as In Memoriam notes, Obituaries, Book Reviews, as well as Editorials, Addenda, Errata, Corrigenda, Retraction notes, etc.