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Postmidnight equatorial plasma irregularities on the June solstice during low solar activity - a case study
Candido, Claudia M. N.1,2; Shi, Jiankui1; Batista, Inez S.2; Becker-Guedes, Fabio2; Correia, Emilia2,6; Abdu, Mangalathayil A.2,4; Makela, Jonathan3; Balan, Nanan7; Chapagain, Narayan5; Wang, Chi1; Liu, Zhengkuan1
2019-07-30
Source PublicationANNALES GEOPHYSICAE
ISSN0992-7689
Volume37Issue:4Pages:657-672
AbstractWe present a case study of unusual spread-F structures observed by ionosondes at two equatorial and low-latitude Brazilian stations - Sao Luis (SL: 44.2 degrees W, 2.33 degrees S; dip angle: -6.9 degrees) and Fortaleza (FZ: 38.45 degrees W, 3.9 degrees S; dip angle: -16 degrees). The irregularity structures observed from midnight to postmidnight hours of moderate solar activity (F10.7 < 97 sfu, where 1 sfu = 10(-22) W m(-2) s(-1)) have characteristics different from typical post-sunset equatorial spread F. The spread-F traces first appeared at or above the F-layer peak and gradually became well-formed mixed spread F. They also appeared as plasma depletions in the 630.0 nm airglow emissions made by a wide-angle imager located at the nearby low-latitude station Cajazeiras (CZ: 38.56 degrees W, 6.87 degrees S; dip angle: -21.4 degrees). The irregularities appeared first over FZ and later over SL, giving evidence of an unusual westward propagation or a horizontal plasma advection. The drift-mode operation available in one of the ionosondes (a digital portable sounder, DPS-4) has enabled us to analyze the horizontal drift velocities and directions of the irregularity movement. We also analyzed the neutral wind velocity measured by a Fabry-Perot interferometer (FPI) installed at CZ and discuss its possible role in the development of the irregularities.
DOI10.5194/angeo-37-657-2019
Funding OrganizationChina-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR ; China-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR ; China-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR ; China-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR
WOS KeywordFIELD-ALIGNED IRREGULARITIES ; SPREAD-F ; REGION ; BUBBLES ; RADAR
Language英语
Funding ProjectChina-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq)[64537/2015-5] ; National Natural Science Foundation of China (NSSC)[41474137] ; National Natural Science Foundation of China (NSSC)[1674145] ; National Science Foundation CEDAR[AGS 09-40253]
Funding OrganizationChina-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR ; China-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR ; China-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR ; China-Brazil Joint Laboratory for Space Weather (CBJLSW) ; Brazilian funding agency (CNPq) ; National Natural Science Foundation of China (NSSC) ; National Science Foundation CEDAR
WOS Research AreaAstronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
WOS SubjectAstronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS IDWOS:000477871400002
PublisherCOPERNICUS GESELLSCHAFT MBH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92961
Collection中国科学院地质与地球物理研究所
Corresponding AuthorCandido, Claudia M. N.
Affiliation1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab, China Brazil Joint Lab Space Weather, Beijing, Peoples R China
2.Natl Inst Space Res INPE, Sao Jose Dos Campos, SP, Brazil
3.Univ Illinois, Dept Elect & Comp Engn, 1406 W Green St, Urbana, IL 61801 USA
4.Inst Tecnol Aeronaut ITA, Sao Jose Dos Campos, Brazil
5.Tribhuvan Univ, Dept Phys, Patan Multiple Campus, Latitpur, Nepal
6.Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Sao Paulo, Brazil
7.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Candido, Claudia M. N.,Shi, Jiankui,Batista, Inez S.,et al. Postmidnight equatorial plasma irregularities on the June solstice during low solar activity - a case study[J]. ANNALES GEOPHYSICAE,2019,37(4):657-672.
APA Candido, Claudia M. N..,Shi, Jiankui.,Batista, Inez S..,Becker-Guedes, Fabio.,Correia, Emilia.,...&Liu, Zhengkuan.(2019).Postmidnight equatorial plasma irregularities on the June solstice during low solar activity - a case study.ANNALES GEOPHYSICAE,37(4),657-672.
MLA Candido, Claudia M. N.,et al."Postmidnight equatorial plasma irregularities on the June solstice during low solar activity - a case study".ANNALES GEOPHYSICAE 37.4(2019):657-672.
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