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  The Influence of Disturbance Dynamo Electric Field in the Formation of Strong SporadicELayers Over Boa Vista, a Low‐Latitude Station in the American Sector

Resende Chagas, L. C., Shi, J. K., Denardini, C. M., Batista, I. S., Nogueira, P. A. B., Arras, C., Andrioli, V. F., Moro, J., Da Silva, L. A., Carrasco, A. J., Barbosa, P. F., Wang, C., Liu, Z. (2020): The Influence of Disturbance Dynamo Electric Field in the Formation of Strong SporadicELayers Over Boa Vista, a Low‐Latitude Station in the American Sector. - Journal of Geophysical Research: Space Physics, 125, 7, e2019JA027519.
https://doi.org/10.1029/2019JA027519

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Resende Chagas, Laysa Cristina1, Author              
Shi, J. K.2, Author
Denardini, C. M.2, Author
Batista, I. S.2, Author
Nogueira, P. A. B.2, Author
Arras, Christina3, Author              
Andrioli, V. F.2, Author
Moro, J.2, Author
Da Silva, L. A.2, Author
Carrasco, A. J.2, Author
Barbosa, P. F.2, Author
Wang, C.2, Author
Liu, Z.2, Author
Affiliations:
10 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              
2External Organizations, ou_persistent22              
31.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146025              

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 Abstract: This study analyzes strong sporadic E layer (Es) formation in Boa Vista (BV, 2.8°N, 60.7°W, dip: 18°), a low‐latitude region in the Brazilian sector, which occurred far after the onset of a magnetic storm recovery phase. Such occurrences were observed during seven magnetic storms with available data for BV. Thus, the ionospheric behavior on days around the magnetic storm that occurred on 20 January 2016 was investigated to search for possible explanations. This analysis indicated that the probable mechanism acting during the Es layer strengthening is the zonal westward electric field caused by a disturbance dynamo. The same evidence was also observed in two other magnetic storms at the same location. Hence, a numerical model of the E region dynamics, called MIRE (Portuguese acronym for E Region Ionospheric Model), was used to confirm whether the disturbance dynamo could cause the Es layer intensification. The inputs for the model were the electric field deduced from the vertical drift and the wind components provided by GSWM‐00 model. The simulations indicate that the Es layer density is significantly enhanced when the zonal electric field is present compared to the reference scenario with only the winds. Therefore, it is concluded that the disturbance dynamo electric field is the likely cause of the strong Es layers in the analyzed cases. Finally, the combined results from the model and observational data seem to contribute significantly to advance our understanding of the role of the electric fields in the Es layer formation at low latitudes.

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 Dates: 2020-06-242020
 Publication Status: Finally published
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 Identifiers: DOI: 10.1029/2019JA027519
GFZPOF: p3 PT6 Atmo
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Title: Journal of Geophysical Research: Space Physics
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 125 (7) Sequence Number: e2019JA027519 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_space_physics
Publisher: American Geophysical Union (AGU)