%0 Journal Article
%4 sid.inpe.br/mtc-m21d/2021/10.04.15.53
%2 sid.inpe.br/mtc-m21d/2021/10.04.15.53.44
%@doi 10.1029/2021JA029416
%@issn 2169-9402
%T New Findings of the Sporadic E (Es) Layer Development Around the Magnetic Equator During a High-Speed Solar (HSS) Wind Stream Event
%D 2021
%8 Sept.
%9 journal article
%A Resende, Laysa Cristina Araújo,
%A Zhu, Y.,
%A Denardini, Clezio Marcos,
%A Batista, Inez Staciarini,
%A Shi, J.,
%A Moro, Juliano,
%A Chen, Sony Su,
%A Conceição Santos, F.,
%A Silva, Ligia Alves da,
%A Andrioli, Vânia Fátima,
%A Muella, Marcio Tadeu de Assis Honorato,
%A Fagundes, P. R.,
%A Carrasco, A. J.,
%A Pillat, V. G.,
%A Wang, C.,
%A Liu, Z.,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation State Key Laboratory of Space Weather
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation State Key Laboratory of Space Weather
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation Universidad de Los Andes
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation State Key Laboratory of Space Weather
%@affiliation State Key Laboratory of Space Weather
%@electronicmailaddress laysa.resende@gmail.com
%@electronicmailaddress
%@electronicmailaddress clezio.denarnin@inpe.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress juliano.moro@inpe.br
%@electronicmailaddress sony.chen@inpe.br
%@electronicmailaddress
%@electronicmailaddress ligia.alves01@gmail.com
%@electronicmailaddress vaniafatima@gmail.com
%B Journal of Geophysical Research: Space Physics
%V 126
%N 9
%P e2021JA029416
%K equatorial sporadic layers, gradient drift instability, sporadic layers simulation.
%X The equatorial (Esq) and blanketing (Esb) sporadic (Es) layers occur due to the Equatorial Electrojet Current (EEJ) plasma instabilities and tidal wind components, respectively. Both Esq and Esb layers can appear concurrently over some Brazilian equatorial regions due to the peculiar geomagnetic field configuration in this sector. Previous works indicate that the inclination angle limit for the Esq occurrence in ionograms is 7°. However, we found evidence that regions more distant can also experience such equatorial dynamics during disturbed periods. In this context, we deeply investigated this EEJ influence expansion effect by analyzing the Esq layers in regions not so close to the magnetic equator during a high-speed solar wind stream event that occurred on May 05 and 06, 2018. To explain these atypical Esq layer occurrences, we considered the Es layer parameters obtained from digital ionosondes over the Brazilian regions, São Luís (dip: 9.5°), and Araguatins (dip: 10.5°). We use magnetometer data and a model named MIRE (E Region Ionospheric Model) to validate this mechanism. The results show that the eastward electric field of the Gradient Drift instability in the EEJ is effective during the magnetic storm main phase in the boundary equatorial magnetic sites, creating the Esq layers. Thus, the EEJ plasma irregularity superimposes the wind shear mechanism, changing the Es layer dynamics during disturbed periods over the magnetic equator boundary sites. Therefore, this work establishes new findings of the EEJ influence expansion dynamics in the Es layer formation over the Brazilian regions, which was considered in MIRE for the first time.
%@language en
%3 resende_new.pdf