@Article{AbduNoSoBaDuSo:2017:EqElRe,
author = "Abdu, Mangalathayil Ali and Nogueira, P. A. B. and Souza, Jonas
Rodrigues de and Batista, Inez Staciarini and Dutra, Severino Luiz
Guimar{\~a}es and Sobral, Jos{\'e} Humberto Andrade",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and Instituto
Federal de Educa{\c{c}}{\~a}o, Ci{\^e}ncia e Tecnologia de
S{\~a}o Paulo and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Equatorial electrojet responses to intense solar flares under
geomagnetic disturbance time electric fields",
journal = "Journal of Geophysical Research: Space Physics",
year = "2017",
volume = "122",
number = "3",
pages = "3570--3585",
month = "Mar.",
keywords = "solar flare, overshielding electric field, equatorial electrojet,
EEJ westward current, disturbance dynamo electric field, sunrise
effect.",
abstract = "Large enhancement in the equatorial electrojet (EEJ) current can
occur due to sudden increase in the E layer density arising from
solar flare associated ionizing radiations, as also from
background electric fields modified by magnetospheric disturbances
when present before or during a solar flare. We investigate the
EEJ responses at widely separated longitudes during two X-class
flares that occurred at different activity phases surrounding the
magnetic super storm sequences of 28-29 October 2003. During the
28 October flare we observed intense reverse electrojet under
strong westward electric field in the sunrise sector over
Jicamarca. Sources of westward disturbance electric fields driving
large EEJ current are identified for the first time. Model
calculations on the E layer density, with and without flare, and
comparison of the results between Jicamarca and Sao Luis suggested
enhanced westward electric field due to the flare occurring close
to sunrise (over Jicamarca). During the flare on 29 October, which
occurred during a rapid AE recovery, a strong overshielding
electric field of westward polarity over Jicamarca delayed an
expected EEJ eastward growth due to flare-induced ionization
enhancement in the afternoon. This EEJ response yielded a measure
of the overshielding decay time determined by the storm time
Region 2 field-aligned current. This paper will present a detailed
analysis of the EEJ responses during the two flares, including a
quantitative evaluation of the flare-induced electron density
enhancements and identification of electric field sources that
played dominant roles in the large westward EEJ at the sunrise
sector over Jicamarca.",
doi = "10.1002/2016JA023667",
url = "http://dx.doi.org/10.1002/2016JA023667",
issn = "2169-9402",
language = "en",
targetfile = "abdu_equatorial.pdf",
urlaccessdate = "27 abr. 2024"
}